Java 根据参数的顺序执行命令
我正在用java构建自己的命令行。我实现了所有其他命令。我想尝试根据ex的参数顺序执行命令） 命令：（历史Y-C），命令：（历史C-Y） （历史Y）表示打印（Y）个数的命令的上一个历史编号，（C）表示清除历史命令 所以（history cy）应该首先清除history命令，然后打印之前的命令的Y个数，这些命令将为空 （历史Y C）应打印Y个以前的命令，然后清除历史命令 如何实现基于不同顺序的代码输出结果 我正在使用split将命令拆分为“”（空格） 这就是我现在得到的Java 根据参数的顺序执行命令,java,arraylist,Java,Arraylist,我正在用java构建自己的命令行。我实现了所有其他命令。我想尝试根据ex的参数顺序执行命令） 命令：（历史Y-C），命令：（历史C-Y） （历史Y）表示打印（Y）个数的命令的上一个历史编号，（C）表示清除历史命令 所以（history cy）应该首先清除history命令，然后打印之前的命令的Y个数，这些命令将为空 （历史Y C）应打印Y个以前的命令，然后清除历史命令 如何实现基于不同顺序的代码输出结果 我正在使用split将命令拆分为“”（空格） 这就是我现在得到的 if (Split
if (Split[0].equals("history")) {
if (Split[1].equals("Y")) {
int num = int parseint(command)
}
if (Split[2].equals("C")) {
" Then clear command"
}
}
public class MyApp {
public static void main(String[] args) {
for (int i = 0; i < args.length; i++) {
System.out.println(args[i]);
}
}
}
Hi,
my
name
is
Johnny
Walker
Hi, my name is Johnny Walker
Hi, my name is Johnny Walker
What's yours?
Is it Bob?
java -jar MyApp.jar "Hi, my name is Johnny Walker" "What's yours?" "Is it Bob?"
MyApp Help:
There are four categorical application functions available that can be
accessed via the Command Line (History, Current, Modify, and Delete).
Each function along with their specific parameters must be supplied as
quoted strings. The functions and their respective parameters can be
supplied in any order, for example:
**java -jar MyApp.jar "modify r=12 l=hypo n=43.55" "history c r=12"**
Categorical Application Functions:
Letter case is optional.
------------------------------------------------------------------
HISTORY:
Display Record(s) History.
C Clear History.
R= Integer - Record Number (0 for all).
------------------------------------------------------------------
CURRENT:
Displays Current Record and Linked Record (if any).
Optionaly displays defined Variable Name.
R= Integer - Make Record Current (0 for No Record).
L= Integer - Linked To Record Number (0 for No Record).
N Optional- Also Display Variable Name.
------------------------------------------------------------------
MODIFY:
Modifies a Record Culture.
R= Integer - Record Number to Modify (0 for All).
L= Integer - Change Linked Record Number (0 for No
Record).
N= String - Change Variable Name ("" for No Name).
------------------------------------------------------------------
DELETE:
Deletes a Record Culture and optionally removes any Links to it.
Records start from a value of 1.
R= Integer - Record Number to Delete (0 for All).
y= Boolean - True to Remove related Links to this
record.
------------------------------------------------------------------
See application documentation for more information regarding Command
Line or use this Command Line Option:
java -jar MyApp.jar /?
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyApp {
public static void main(String[] args) {
// Are there Command Line arguments?
if (args.length > 0) {
// Yes there is...
for (int i = 0; i < args.length; i++) {
String[] suppliedArgs = args[i].toLowerCase().split("\\s+");
// Function Categories
switch (suppliedArgs[0]) {
case "/?":
doDisplayHelpInConsole();
System.exit(0);
break;
case "history":
doHistory(suppliedArgs);
break;
case "current":
doCurrent(suppliedArgs);
break;
case "modify":
doModify(suppliedArgs);
break;
case "delete":
doDelete(suppliedArgs);
break;
default:
System.out.println("Skipping Unknown Command Line Function (" +
suppliedArgs[0] + ")!");
}
}
}
System.out.println("DONE!");
}
private static void doDisplayHelpInConsole() {
// Prepare to read the MyAppHelp.txt file from
// the run location of MyApp.jar. This help text
// file must reside in the same location the jar
// file resides in.
File helpFile = new File(new File("").getAbsolutePath() +
File.separator + "MyAppHelp.txt");
if (!helpFile.exists()) {
System.out.println("Help is not available - File Not Found!" +
System.lineSeparator() + "[" + helpFile.getAbsolutePath() +
"]");
return;
}
try {
// Try with Resources - Auto closes file.
try (Scanner reader = new Scanner(helpFile)) {
while (reader.hasNextLine()) {
System.out.println(reader.nextLine());
}
}
}
catch (FileNotFoundException ex) {
Logger.getLogger(MyApp.class.getName()).log(Level.SEVERE, null, ex);
// or use: ex.printStackTrace();
}
}
private static void doHistory(String[] args) {
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "c":
// Do what C is suppose to do...
clearHistory(); // A method to clear history
System.out.println("History Cleared!");
break;
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
default:
System.out.println("Unknown Assignment for History (" +
params[0] + ")! History Failed!");
}
}
}
private static void doCurrent(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Linked to Record Number: " + lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Variable Name: " + varName);
break;
default:
System.out.println("Unknown Assignment for Current (" +
params[0] + ")! Current Failed!");
}
}
}
private static void doModify(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Modifying Linked Record Number To: " + lRecordNum);
modifyLinkedRecordNumber(recordNum, lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Modifying Variable Name To: " + varName);
modifyVariableName(recordNum, varName);
break;
default:
System.out.println("Unknown Assignment for Modify (" +
params[0] + ")! Modify Failed!");
}
}
}
private static void doDelete(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
if (deleteRecord(recordNum)) {
System.out.println("Record Number " + recordNum +
" has been Deleted.");
}
}
break;
case "y":
// Do what Y is suppose to do...
boolean doDel = false;
if (params[1].equalsIgnoreCase("true")) {
if (deleteAllLinksTo(recordNum)) {
System.out.println("All Links related to Record Number " +
recordNum + " have been removed.");
}
}
else if (!params[1].equalsIgnoreCase("false")) {
System.out.println("Unknown Boolean argument supplied for Y "
+ "parameter of the DELETE function (" +
params[i] + ")! Link Deletion Failed!");
}
break;
default:
System.out.println("Unknown Assignment for Delete (" +
params[0] + ")! Delete Failed!");
}
}
}
private static void clearHistory() {
// A method to clear all history.
//Code goes here........
}
private static void displayRecord (int recordNum) {
// A method to display a specific record.
//Code goes here........
}
private static String getVariableName(int recNum) {
// A method to get variable name for a specific record.
String varName = "";
//Code goes here........
return varName;
}
private static void modifyLinkedRecordNumber(int recordNum, int newLinkedNum) {
// A method to modify the liknked record number for a speciic record.
//Code goes here........
}
private static void modifyVariableName(int recordNum, String varName) {
// A method to modify the Variable Name for a speciic record.
//Code goes here........
}
private static boolean deleteRecord (int recordNum) {
// A method to Delete a speciic record.
//Code goes here........
return true;
}
private static boolean deleteAllLinksTo (int recordNum) {
// A method to Delete ALL Links to the supplied record.
//Code goes here........
return true;
}
}
Hi,
my
name
is
Johnny
Walker
Hi, my name is Johnny Walker
Hi, my name is Johnny Walker
What's yours?
Is it Bob?
java -jar MyApp.jar "Hi, my name is Johnny Walker" "What's yours?" "Is it Bob?"
MyApp Help:
There are four categorical application functions available that can be
accessed via the Command Line (History, Current, Modify, and Delete).
Each function along with their specific parameters must be supplied as
quoted strings. The functions and their respective parameters can be
supplied in any order, for example:
**java -jar MyApp.jar "modify r=12 l=hypo n=43.55" "history c r=12"**
Categorical Application Functions:
Letter case is optional.
------------------------------------------------------------------
HISTORY:
Display Record(s) History.
C Clear History.
R= Integer - Record Number (0 for all).
------------------------------------------------------------------
CURRENT:
Displays Current Record and Linked Record (if any).
Optionaly displays defined Variable Name.
R= Integer - Make Record Current (0 for No Record).
L= Integer - Linked To Record Number (0 for No Record).
N Optional- Also Display Variable Name.
------------------------------------------------------------------
MODIFY:
Modifies a Record Culture.
R= Integer - Record Number to Modify (0 for All).
L= Integer - Change Linked Record Number (0 for No
Record).
N= String - Change Variable Name ("" for No Name).
------------------------------------------------------------------
DELETE:
Deletes a Record Culture and optionally removes any Links to it.
Records start from a value of 1.
R= Integer - Record Number to Delete (0 for All).
y= Boolean - True to Remove related Links to this
record.
------------------------------------------------------------------
See application documentation for more information regarding Command
Line or use this Command Line Option:
java -jar MyApp.jar /?
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyApp {
public static void main(String[] args) {
// Are there Command Line arguments?
if (args.length > 0) {
// Yes there is...
for (int i = 0; i < args.length; i++) {
String[] suppliedArgs = args[i].toLowerCase().split("\\s+");
// Function Categories
switch (suppliedArgs[0]) {
case "/?":
doDisplayHelpInConsole();
System.exit(0);
break;
case "history":
doHistory(suppliedArgs);
break;
case "current":
doCurrent(suppliedArgs);
break;
case "modify":
doModify(suppliedArgs);
break;
case "delete":
doDelete(suppliedArgs);
break;
default:
System.out.println("Skipping Unknown Command Line Function (" +
suppliedArgs[0] + ")!");
}
}
}
System.out.println("DONE!");
}
private static void doDisplayHelpInConsole() {
// Prepare to read the MyAppHelp.txt file from
// the run location of MyApp.jar. This help text
// file must reside in the same location the jar
// file resides in.
File helpFile = new File(new File("").getAbsolutePath() +
File.separator + "MyAppHelp.txt");
if (!helpFile.exists()) {
System.out.println("Help is not available - File Not Found!" +
System.lineSeparator() + "[" + helpFile.getAbsolutePath() +
"]");
return;
}
try {
// Try with Resources - Auto closes file.
try (Scanner reader = new Scanner(helpFile)) {
while (reader.hasNextLine()) {
System.out.println(reader.nextLine());
}
}
}
catch (FileNotFoundException ex) {
Logger.getLogger(MyApp.class.getName()).log(Level.SEVERE, null, ex);
// or use: ex.printStackTrace();
}
}
private static void doHistory(String[] args) {
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "c":
// Do what C is suppose to do...
clearHistory(); // A method to clear history
System.out.println("History Cleared!");
break;
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
default:
System.out.println("Unknown Assignment for History (" +
params[0] + ")! History Failed!");
}
}
}
private static void doCurrent(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Linked to Record Number: " + lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Variable Name: " + varName);
break;
default:
System.out.println("Unknown Assignment for Current (" +
params[0] + ")! Current Failed!");
}
}
}
private static void doModify(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Modifying Linked Record Number To: " + lRecordNum);
modifyLinkedRecordNumber(recordNum, lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Modifying Variable Name To: " + varName);
modifyVariableName(recordNum, varName);
break;
default:
System.out.println("Unknown Assignment for Modify (" +
params[0] + ")! Modify Failed!");
}
}
}
private static void doDelete(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
if (deleteRecord(recordNum)) {
System.out.println("Record Number " + recordNum +
" has been Deleted.");
}
}
break;
case "y":
// Do what Y is suppose to do...
boolean doDel = false;
if (params[1].equalsIgnoreCase("true")) {
if (deleteAllLinksTo(recordNum)) {
System.out.println("All Links related to Record Number " +
recordNum + " have been removed.");
}
}
else if (!params[1].equalsIgnoreCase("false")) {
System.out.println("Unknown Boolean argument supplied for Y "
+ "parameter of the DELETE function (" +
params[i] + ")! Link Deletion Failed!");
}
break;
default:
System.out.println("Unknown Assignment for Delete (" +
params[0] + ")! Delete Failed!");
}
}
}
private static void clearHistory() {
// A method to clear all history.
//Code goes here........
}
private static void displayRecord (int recordNum) {
// A method to display a specific record.
//Code goes here........
}
private static String getVariableName(int recNum) {
// A method to get variable name for a specific record.
String varName = "";
//Code goes here........
return varName;
}
private static void modifyLinkedRecordNumber(int recordNum, int newLinkedNum) {
// A method to modify the liknked record number for a speciic record.
//Code goes here........
}
private static void modifyVariableName(int recordNum, String varName) {
// A method to modify the Variable Name for a speciic record.
//Code goes here........
}
private static boolean deleteRecord (int recordNum) {
// A method to Delete a speciic record.
//Code goes here........
return true;
}
private static boolean deleteAllLinksTo (int recordNum) {
// A method to Delete ALL Links to the supplied record.
//Code goes here........
return true;
}
}
Hi,
my
name
is
Johnny
Walker
Hi, my name is Johnny Walker
Hi, my name is Johnny Walker
What's yours?
Is it Bob?
java -jar MyApp.jar "Hi, my name is Johnny Walker" "What's yours?" "Is it Bob?"
MyApp Help:
There are four categorical application functions available that can be
accessed via the Command Line (History, Current, Modify, and Delete).
Each function along with their specific parameters must be supplied as
quoted strings. The functions and their respective parameters can be
supplied in any order, for example:
**java -jar MyApp.jar "modify r=12 l=hypo n=43.55" "history c r=12"**
Categorical Application Functions:
Letter case is optional.
------------------------------------------------------------------
HISTORY:
Display Record(s) History.
C Clear History.
R= Integer - Record Number (0 for all).
------------------------------------------------------------------
CURRENT:
Displays Current Record and Linked Record (if any).
Optionaly displays defined Variable Name.
R= Integer - Make Record Current (0 for No Record).
L= Integer - Linked To Record Number (0 for No Record).
N Optional- Also Display Variable Name.
------------------------------------------------------------------
MODIFY:
Modifies a Record Culture.
R= Integer - Record Number to Modify (0 for All).
L= Integer - Change Linked Record Number (0 for No
Record).
N= String - Change Variable Name ("" for No Name).
------------------------------------------------------------------
DELETE:
Deletes a Record Culture and optionally removes any Links to it.
Records start from a value of 1.
R= Integer - Record Number to Delete (0 for All).
y= Boolean - True to Remove related Links to this
record.
------------------------------------------------------------------
See application documentation for more information regarding Command
Line or use this Command Line Option:
java -jar MyApp.jar /?
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyApp {
public static void main(String[] args) {
// Are there Command Line arguments?
if (args.length > 0) {
// Yes there is...
for (int i = 0; i < args.length; i++) {
String[] suppliedArgs = args[i].toLowerCase().split("\\s+");
// Function Categories
switch (suppliedArgs[0]) {
case "/?":
doDisplayHelpInConsole();
System.exit(0);
break;
case "history":
doHistory(suppliedArgs);
break;
case "current":
doCurrent(suppliedArgs);
break;
case "modify":
doModify(suppliedArgs);
break;
case "delete":
doDelete(suppliedArgs);
break;
default:
System.out.println("Skipping Unknown Command Line Function (" +
suppliedArgs[0] + ")!");
}
}
}
System.out.println("DONE!");
}
private static void doDisplayHelpInConsole() {
// Prepare to read the MyAppHelp.txt file from
// the run location of MyApp.jar. This help text
// file must reside in the same location the jar
// file resides in.
File helpFile = new File(new File("").getAbsolutePath() +
File.separator + "MyAppHelp.txt");
if (!helpFile.exists()) {
System.out.println("Help is not available - File Not Found!" +
System.lineSeparator() + "[" + helpFile.getAbsolutePath() +
"]");
return;
}
try {
// Try with Resources - Auto closes file.
try (Scanner reader = new Scanner(helpFile)) {
while (reader.hasNextLine()) {
System.out.println(reader.nextLine());
}
}
}
catch (FileNotFoundException ex) {
Logger.getLogger(MyApp.class.getName()).log(Level.SEVERE, null, ex);
// or use: ex.printStackTrace();
}
}
private static void doHistory(String[] args) {
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "c":
// Do what C is suppose to do...
clearHistory(); // A method to clear history
System.out.println("History Cleared!");
break;
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
default:
System.out.println("Unknown Assignment for History (" +
params[0] + ")! History Failed!");
}
}
}
private static void doCurrent(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Linked to Record Number: " + lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Variable Name: " + varName);
break;
default:
System.out.println("Unknown Assignment for Current (" +
params[0] + ")! Current Failed!");
}
}
}
private static void doModify(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Modifying Linked Record Number To: " + lRecordNum);
modifyLinkedRecordNumber(recordNum, lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Modifying Variable Name To: " + varName);
modifyVariableName(recordNum, varName);
break;
default:
System.out.println("Unknown Assignment for Modify (" +
params[0] + ")! Modify Failed!");
}
}
}
private static void doDelete(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
if (deleteRecord(recordNum)) {
System.out.println("Record Number " + recordNum +
" has been Deleted.");
}
}
break;
case "y":
// Do what Y is suppose to do...
boolean doDel = false;
if (params[1].equalsIgnoreCase("true")) {
if (deleteAllLinksTo(recordNum)) {
System.out.println("All Links related to Record Number " +
recordNum + " have been removed.");
}
}
else if (!params[1].equalsIgnoreCase("false")) {
System.out.println("Unknown Boolean argument supplied for Y "
+ "parameter of the DELETE function (" +
params[i] + ")! Link Deletion Failed!");
}
break;
default:
System.out.println("Unknown Assignment for Delete (" +
params[0] + ")! Delete Failed!");
}
}
}
private static void clearHistory() {
// A method to clear all history.
//Code goes here........
}
private static void displayRecord (int recordNum) {
// A method to display a specific record.
//Code goes here........
}
private static String getVariableName(int recNum) {
// A method to get variable name for a specific record.
String varName = "";
//Code goes here........
return varName;
}
private static void modifyLinkedRecordNumber(int recordNum, int newLinkedNum) {
// A method to modify the liknked record number for a speciic record.
//Code goes here........
}
private static void modifyVariableName(int recordNum, String varName) {
// A method to modify the Variable Name for a speciic record.
//Code goes here........
}
private static boolean deleteRecord (int recordNum) {
// A method to Delete a speciic record.
//Code goes here........
return true;
}
private static boolean deleteAllLinksTo (int recordNum) {
// A method to Delete ALL Links to the supplied record.
//Code goes here........
return true;
}
}
java -jar MyApp.jar "Hi, my name is Johnny Walker" "What's yours?" "Is it Bob?"
MyApp Help:
There are four categorical application functions available that can be
accessed via the Command Line (History, Current, Modify, and Delete).
Each function along with their specific parameters must be supplied as
quoted strings. The functions and their respective parameters can be
supplied in any order, for example:
**java -jar MyApp.jar "modify r=12 l=hypo n=43.55" "history c r=12"**
Categorical Application Functions:
Letter case is optional.
------------------------------------------------------------------
HISTORY:
Display Record(s) History.
C Clear History.
R= Integer - Record Number (0 for all).
------------------------------------------------------------------
CURRENT:
Displays Current Record and Linked Record (if any).
Optionaly displays defined Variable Name.
R= Integer - Make Record Current (0 for No Record).
L= Integer - Linked To Record Number (0 for No Record).
N Optional- Also Display Variable Name.
------------------------------------------------------------------
MODIFY:
Modifies a Record Culture.
R= Integer - Record Number to Modify (0 for All).
L= Integer - Change Linked Record Number (0 for No
Record).
N= String - Change Variable Name ("" for No Name).
------------------------------------------------------------------
DELETE:
Deletes a Record Culture and optionally removes any Links to it.
Records start from a value of 1.
R= Integer - Record Number to Delete (0 for All).
y= Boolean - True to Remove related Links to this
record.
------------------------------------------------------------------
See application documentation for more information regarding Command
Line or use this Command Line Option:
java -jar MyApp.jar /?
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyApp {
public static void main(String[] args) {
// Are there Command Line arguments?
if (args.length > 0) {
// Yes there is...
for (int i = 0; i < args.length; i++) {
String[] suppliedArgs = args[i].toLowerCase().split("\\s+");
// Function Categories
switch (suppliedArgs[0]) {
case "/?":
doDisplayHelpInConsole();
System.exit(0);
break;
case "history":
doHistory(suppliedArgs);
break;
case "current":
doCurrent(suppliedArgs);
break;
case "modify":
doModify(suppliedArgs);
break;
case "delete":
doDelete(suppliedArgs);
break;
default:
System.out.println("Skipping Unknown Command Line Function (" +
suppliedArgs[0] + ")!");
}
}
}
System.out.println("DONE!");
}
private static void doDisplayHelpInConsole() {
// Prepare to read the MyAppHelp.txt file from
// the run location of MyApp.jar. This help text
// file must reside in the same location the jar
// file resides in.
File helpFile = new File(new File("").getAbsolutePath() +
File.separator + "MyAppHelp.txt");
if (!helpFile.exists()) {
System.out.println("Help is not available - File Not Found!" +
System.lineSeparator() + "[" + helpFile.getAbsolutePath() +
"]");
return;
}
try {
// Try with Resources - Auto closes file.
try (Scanner reader = new Scanner(helpFile)) {
while (reader.hasNextLine()) {
System.out.println(reader.nextLine());
}
}
}
catch (FileNotFoundException ex) {
Logger.getLogger(MyApp.class.getName()).log(Level.SEVERE, null, ex);
// or use: ex.printStackTrace();
}
}
private static void doHistory(String[] args) {
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "c":
// Do what C is suppose to do...
clearHistory(); // A method to clear history
System.out.println("History Cleared!");
break;
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
default:
System.out.println("Unknown Assignment for History (" +
params[0] + ")! History Failed!");
}
}
}
private static void doCurrent(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
displayRecord(recordNum); // A method to display record
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Linked to Record Number: " + lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Variable Name: " + varName);
break;
default:
System.out.println("Unknown Assignment for Current (" +
params[0] + ")! Current Failed!");
}
}
}
private static void doModify(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
}
break;
case "l":
// Do what L is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
int lRecordNum = Integer.parseInt(params[1]);
System.out.println("Modifying Linked Record Number To: " + lRecordNum);
modifyLinkedRecordNumber(recordNum, lRecordNum);
}
break;
case "n":
// Do what N is suppose to do...
String varName = getVariableName(recordNum);
System.out.println("Modifying Variable Name To: " + varName);
modifyVariableName(recordNum, varName);
break;
default:
System.out.println("Unknown Assignment for Modify (" +
params[0] + ")! Modify Failed!");
}
}
}
private static void doDelete(String[] args) {
int recordNum = 0;
for (int i = 1; i < args.length; i++) {
// Split the parameter name and its value
String[] params = args[i].split(" = |= | =|=");
// Process Parameters
switch (params[0]) {
case "r":
// Do what R is suppose to do...
// Is the supplied value Numerical?
if (params[1].matches("\\d+")) {
// Yes...convert to integer
recordNum = Integer.parseInt(params[1]);
if (deleteRecord(recordNum)) {
System.out.println("Record Number " + recordNum +
" has been Deleted.");
}
}
break;
case "y":
// Do what Y is suppose to do...
boolean doDel = false;
if (params[1].equalsIgnoreCase("true")) {
if (deleteAllLinksTo(recordNum)) {
System.out.println("All Links related to Record Number " +
recordNum + " have been removed.");
}
}
else if (!params[1].equalsIgnoreCase("false")) {
System.out.println("Unknown Boolean argument supplied for Y "
+ "parameter of the DELETE function (" +
params[i] + ")! Link Deletion Failed!");
}
break;
default:
System.out.println("Unknown Assignment for Delete (" +
params[0] + ")! Delete Failed!");
}
}
}
private static void clearHistory() {
// A method to clear all history.
//Code goes here........
}
private static void displayRecord (int recordNum) {
// A method to display a specific record.
//Code goes here........
}
private static String getVariableName(int recNum) {
// A method to get variable name for a specific record.
String varName = "";
//Code goes here........
return varName;
}
private static void modifyLinkedRecordNumber(int recordNum, int newLinkedNum) {
// A method to modify the liknked record number for a speciic record.
//Code goes here........
}
private static void modifyVariableName(int recordNum, String varName) {
// A method to modify the Variable Name for a speciic record.
//Code goes here........
}
private static boolean deleteRecord (int recordNum) {
// A method to Delete a speciic record.
//Code goes here........
return true;
}
private static boolean deleteAllLinksTo (int recordNum) {
// A method to Delete ALL Links to the supplied record.
//Code goes here........
return true;
}
}
导入java.io.File；
导入java.io.FileNotFoundException；
导入java.util.Scanner；
导入java.util.logging.Level；
导入java.util.logging.Logger；
公共类MyApp{
公共静态void main（字符串[]args）{
//有命令行参数吗？
如果（args.length>0）{
//是的，有。。。
对于（int i=0；i