JAVA如何用txt文件中的数组替换scnr.next（），以避免用户键入数千次？
我注意到用户必须输入很多变量才能完成这项任务。用户需要根据此代码键入90次。我听说我可以使用File，PrintWriter来允许扫描仪读取数组形式的txt内容。我查阅了很多教程，但很难达到我的目标。您介意我帮助我将我的scnr.next（）替换为txt文件中的数组吗JAVA如何用txt文件中的数组替换scnr.next（），以避免用户键入数千次？,java,arrays,methods,java.util.scanner,Java,Arrays,Methods,Java.util.scanner,我注意到用户必须输入很多变量才能完成这项任务。用户需要根据此代码键入90次。我听说我可以使用File，PrintWriter来允许扫描仪读取数组形式的txt内容。我查阅了很多教程，但很难达到我的目标。您介意我帮助我将我的scnr.next（）替换为txt文件中的数组吗 import java.util.Scanner; public class midtermBc3Choe{ public static void main (String [] args){ int wor
import java.util.Scanner;
public class midtermBc3Choe{
public static void main (String [] args){
int workerNum = 30;
int jobNum = 5;
int monthNum = 6;
System.out.println("There are 2 criteria to consider per job.");
System.out.println("There are" + jobNum + "jobs for a person per month.");
System.out.println("Tell a worker's quality of his job by useing word 'good' or 'bad.'");
double correctEachTask[][][] = new double [workerNum][monthNum][jobNum];
double correctMonthly[][] = new double [workerNum][monthNum];
double correct6Month[] = new double [workerNum];
Scanner scnr = new Scanner(System.in);
for (int i = 0 ; i < workerNum ; i++){//workers
for(int j=0; j< monthNum; j++){//month
for(int k=0; k< jobNum; k++){//jobs
boolean criteria1 = false;
boolean criteria2 = false;
String string1 = scnr.next();
String string2 = scnr.next();
if( string1.equals("good") && string2.equals("good") ){
criteria1= true;
criteria2 = true;
correctEachTask[i][j][k] = 1.0;
}
else if( string1.equals("good") && string2.equals("bad") ){
criteria1 = true;
criteria2 = false;
correctEachTask[i][j][k] = 0.5;
}
else if( string1.equals("bad") && string2.equals("good") ){
criteria1 = false;
criteria2 = true;
correctEachTask[i][j][k] = 0.5;
}
else{
correctEachTask[i][j][k] = 0.0;
}
}//end - task -each
}// end j - month -each
}//end k - workers - each
for(int i= 0; i< workerNum; ++i){
for(int j = 0; j < monthNum; ++j){
double accum =0;
for(int k =0; k < jobNum; ++k){
accum += correctEachTask[i][j][k];
}//for k - monthly avg correct
correctMonthly[i][j]=accum/jobNum;
}//for j- month - monthly avg correct
}// for i - workerNum -monthly avg correct
for(int i =0; i < workerNum; ++i){
double accumMonthlyAvg =0;
for(int j= 0; j < monthNum ; ++j){
accumMonthlyAvg += correctMonthly[i][j];
}// for j - month - 6 month avg correct
correct6Month[i] = accumMonthlyAvg/monthNum;
}// for i - workerNum - 6 month avg correct
System.out.print("workers' monthly average: ");
for (int i =0; i < workerNum; ++i){
for(int j = 0; j < monthNum; ++j){
System.out.print(correctMonthly[i][j]);
}
}//print out montly average
System.out.println(" ");
System.out.print("worker 6 month average: ");
for (int i =0; i < workerNum; ++i){
System.out.print(correct6Month[i]);
}//print out 6 month average
}//main
}//class
这是我得到的
- 用
替换BufferedReader
，读取文件扫描仪 - 循环文件中的所有行，并在循环时将它们附加到
变量StringBuilder - 完成后，使用
方法获取包含所有单词的数组split - 现在，您可以循环已获得的数组。数组中的第0个元素将是
，第一个元素将是string1
，在第一个三重嵌套for循环中，依此类推string2 - 请注意，字数为120。您的三重嵌套for循环将运行（30*6*5）=900次。这将导致出现
ArrayIndexOutOfBoundsException - 此外，您的
和criteria1
未被使用criteria2
public static void main(String[] args) {
int workerNum = 30;
int jobNum = 5;
int monthNum = 6;
System.out.println("There are 2 criteria to consider per job.");
System.out.println("There are" + jobNum + "jobs for a person per month.");
System.out.println("Tell a worker's quality of his job by useing word 'good' or 'bad.'");
double correctEachTask[][][] = new double[workerNum][monthNum][jobNum];
double correctMonthly[][] = new double[workerNum][monthNum];
double correct6Month[] = new double[workerNum];
BufferedReader br = null;//Use BufferedReader instead Scanner.
String rawData = "";//This will store all the text read from the file.
try {
br = new BufferedReader(new FileReader("input.txt"));
//Read the file until the end, then store the text read in rawData.
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append(System.lineSeparator());
line = br.readLine();
}
rawData = sb.toString();//here, convert the StringBuilder to normal String
br.close();
} catch (FileNotFoundException ex) {
Logger.getLogger(Example.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Example.class.getName()).log(Level.SEVERE, null, ex);
}
//Now, we will split the long text whenever there is a space ie " ". We will obtain an array
//that will have all the "words" that you are looking for.
String[] cleanData = rawData.split(" ");
//check everything is read correctly.
for (int i = 0; i < cleanData.length - 1; i++) {
System.out.println(cleanData[i]);
}
//Here, we will create a counter to loop through the array we obtained earlier.
int counter = 0;
for (int i = 0; i < workerNum; i++) {//workers
for (int j = 0; j < monthNum; j++) {//month
for (int k = 0; k < jobNum; k++) {//jobs
boolean criteria1 = false;
boolean criteria2 = false;
//if reached the end of file
//without this if statement, your program will crash.
if (counter >= cleanData.length - 1) {
return;
}
//read the zeroth element
String string1 = cleanData[counter];
counter++;//increase the counter to read the first element
String string2 = cleanData[counter];
counter++;//increase the counter to read the second element once it loops back.
if (string1.equals("good") && string2.equals("good")) {
criteria1 = true;
criteria2 = true;
correctEachTask[i][j][k] = 1.0;
} else if (string1.equals("good") && string2.equals("bad")) {
criteria1 = true;
criteria2 = false;
correctEachTask[i][j][k] = 0.5;
} else if (string1.equals("bad") && string2.equals("good")) {
criteria1 = false;
criteria2 = true;
correctEachTask[i][j][k] = 0.5;
} else {
correctEachTask[i][j][k] = 0.0;
}
}//end - task -each
}// end j - month -each
}//end k - workers - each
for (int i = 0; i < workerNum; ++i) {
for (int j = 0; j < monthNum; ++j) {
double accum = 0;
for (int k = 0; k < jobNum; ++k) {
accum += correctEachTask[i][j][k];
}//for k - monthly avg correct
correctMonthly[i][j] = accum / jobNum;
}//for j- month - monthly avg correct
}// for i - workerNum -monthly avg correct
for (int i = 0; i < workerNum; ++i) {
double accumMonthlyAvg = 0;
for (int j = 0; j < monthNum; ++j) {
accumMonthlyAvg += correctMonthly[i][j];
}// for j - month - 6 month avg correct
correct6Month[i] = accumMonthlyAvg / monthNum;
}// for i - workerNum - 6 month avg correct
System.out.print("workers' monthly average: ");
for (int i = 0; i < workerNum; ++i) {
for (int j = 0; j < monthNum; ++j) {
System.out.print(correctMonthly[i][j]);
}
}//print out montly average
System.out.println(" ");
System.out.print("worker 6 month average: ");
for (int i = 0; i < workerNum; ++i) {
System.out.print(correct6Month[i]);
}//print out 6 month average
}//main
publicstaticvoidmain（字符串[]args）{
int workerNum=30；
int-jobNum=5；
int-monthNum=6；
So.Ex.PrtLn（“每个工作有2个标准考虑”）；
System.out.println（“每个人每月有“+jobNum+”个工作。”）；
System.out.println（“通过使用“好”或“坏”两个词来告诉工人他的工作质量”；
double CorrectiveAchTask[][]=新的double[workerNum][monthNum][jobNum]；
双倍每月[][]=新的双倍[工作日][月日]；
双精度6个月[]=新双精度[工作日]；
BufferedReader br=null；//使用BufferedReader代替扫描仪。
String rawData=“；//这将存储从文件读取的所有文本。
试一试{
br=新的BufferedReader（新的文件读取器（“input.txt”）；
//读取文件直到结束，然后将读取的文本存储在rawData中。
StringBuilder sb=新的StringBuilder（）；
String line=br.readLine（）；
while（行！=null）{
某人附加（行）；
sb.append（System.lineSeparator（））；
line=br.readLine（）；
}
rawData=sb.toString（）；//这里，将StringBuilder转换为普通字符串
br.close（）；
}捕获（FileNotFoundException ex）{
Logger.getLogger（例如.class.getName（））.log（Level.SEVERE，null，ex）；
}捕获（IOEX异常）{
Logger.getLogger（例如.class.getName（））.log（Level.SEVERE，null，ex）；
}
//现在，只要有空格，我们就会分割长文本。我们将获得一个数组
//这将有所有的“话”，你正在寻找。
字符串[]cleanData=rawData.split（“”）；
//检查所有内容是否正确阅读。
对于（int i=0；i=cleanData.length-1）{
返回；
}
//读取第0个元素
字符串string1=cleanData[计数器]；
计数器+++；//增加计数器以读取第一个元素
字符串string2=cleanData[计数器]；
计数器+++；//增加计数器以在第二个元素循环后读取它。
if（string1.equals（“好”）和string2.equals（“好”））{
标准1=正确；
准则2=正确；
修正任务[i][j][k]=1.0；
}else if（string1.equals（“好”）&string2.equals（“坏”））{
标准1=正确；
标准2=错误；
修正任务[i][j][k]=0.5；
}else if（string1.equals（“坏”）&string2.equals（“好”））{
标准1=错误；
准则2=正确；
修正任务[i][j][k]=0.5；
}否则{
修正任务[i][j][k]=0.0；
}
}//结束-任务-每个
}//j月底-每个月
}//k端-工人-每个
对于（int i=0；i public static void main(String[] args) {
int workerNum = 30;
int jobNum = 5;
int monthNum = 6;
System.out.println("There are 2 criteria to consider per job.");
System.out.println("There are" + jobNum + "jobs for a person per month.");
System.out.println("Tell a worker's quality of his job by useing word 'good' or 'bad.'");
double correctEachTask[][][] = new double[workerNum][monthNum][jobNum];
double correctMonthly[][] = new double[workerNum][monthNum];
double correct6Month[] = new double[workerNum];
BufferedReader br = null;//Use BufferedReader instead Scanner.
String rawData = "";//This will store all the text read from the file.
try {
br = new BufferedReader(new FileReader("input.txt"));
//Read the file until the end, then store the text read in rawData.
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
sb.append(System.lineSeparator());
line = br.readLine();
}
rawData = sb.toString();//here, convert the StringBuilder to normal String
br.close();
} catch (FileNotFoundException ex) {
Logger.getLogger(Example.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Example.class.getName()).log(Level.SEVERE, null, ex);
}
//Now, we will split the long text whenever there is a space ie " ". We will obtain an array
//that will have all the "words" that you are looking for.
String[] cleanData = rawData.split(" ");
//check everything is read correctly.
for (int i = 0; i < cleanData.length - 1; i++) {
System.out.println(cleanData[i]);
}
//Here, we will create a counter to loop through the array we obtained earlier.
int counter = 0;
for (int i = 0; i < workerNum; i++) {//workers
for (int j = 0; j < monthNum; j++) {//month
for (int k = 0; k < jobNum; k++) {//jobs
boolean criteria1 = false;
boolean criteria2 = false;
//if reached the end of file
//without this if statement, your program will crash.
if (counter >= cleanData.length - 1) {
return;
}
//read the zeroth element
String string1 = cleanData[counter];
counter++;//increase the counter to read the first element
String string2 = cleanData[counter];
counter++;//increase the counter to read the second element once it loops back.
if (string1.equals("good") && string2.equals("good")) {
criteria1 = true;
criteria2 = true;
correctEachTask[i][j][k] = 1.0;
} else if (string1.equals("good") && string2.equals("bad")) {
criteria1 = true;
criteria2 = false;
correctEachTask[i][j][k] = 0.5;
} else if (string1.equals("bad") && string2.equals("good")) {
criteria1 = false;
criteria2 = true;
correctEachTask[i][j][k] = 0.5;
} else {
correctEachTask[i][j][k] = 0.0;
}
}//end - task -each
}// end j - month -each
}//end k - workers - each
for (int i = 0; i < workerNum; ++i) {
for (int j = 0; j < monthNum; ++j) {
double accum = 0;
for (int k = 0; k < jobNum; ++k) {
accum += correctEachTask[i][j][k];
}//for k - monthly avg correct
correctMonthly[i][j] = accum / jobNum;
}//for j- month - monthly avg correct
}// for i - workerNum -monthly avg correct
for (int i = 0; i < workerNum; ++i) {
double accumMonthlyAvg = 0;
for (int j = 0; j < monthNum; ++j) {
accumMonthlyAvg += correctMonthly[i][j];
}// for j - month - 6 month avg correct
correct6Month[i] = accumMonthlyAvg / monthNum;
}// for i - workerNum - 6 month avg correct
System.out.print("workers' monthly average: ");
for (int i = 0; i < workerNum; ++i) {
for (int j = 0; j < monthNum; ++j) {
System.out.print(correctMonthly[i][j]);
}
}//print out montly average
System.out.println(" ");
System.out.print("worker 6 month average: ");
for (int i = 0; i < workerNum; ++i) {
System.out.print(correct6Month[i]);
}//print out 6 month average
}//main