Java 如果要比较的两个值具有相同的值，如何打印存储在treemap中的值？
如果我输入以下内容：Java 如果要比较的两个值具有相同的值，如何打印存储在treemap中的值？,java,sorting,treemap,Java,Sorting,Treemap,如果我输入以下内容： student #1 id number: 1 name: aaa course: cs student#2 id number: 1 name: aaa course: cs 树映射应提示它按id号排序。 然后，它应该这样打印： student id number course aaa 1 cs aaa 1 cs student id number course aaa 1
student #1
id number: 1
name: aaa
course: cs
student#2
id number: 1
name: aaa
course: cs
然后，它应该这样打印：
student id number course
aaa 1 cs
aaa 1 cs
student id number course
aaa 1 cs
student id number course
aaa 1 cs
aaa 1 cs
student id number course
aaa 1 cs
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.TreeMap;
public class studentreport {
static Scanner j = new Scanner(System.in);
static Scanner a = new Scanner(System.in);
public static void main(String[] args) {
List<String> studentnumberA = new ArrayList<String>();
List<String> studentnameA = new ArrayList<String>();
List<String> courseA = new ArrayList<String>();
List<Double> prelimA = new ArrayList<Double>();
List<Double> midtermA = new ArrayList<Double>();
List<Double> finalsA = new ArrayList<Double>();
List<Double> sumA = new ArrayList<Double>();
double prelim, midterm, finals;
String menu, menu2;
String transaction = null, transaction2 = null, transaction3 = null;
String studentname = null, course = null, studentnumber = null;
do {
System.out.print("\t\t\tDi Natuto University \n\t\t\t " +
"Pililla,Rizal \n\n\t\t\t" +
"Main Menu \n\t\tSM\tStudent Maintenance" +
"\n\t\tSR\tStudent Report \n\t\tSGR\t" +
"Student Grade Report \n\t\tX\tExit \n\n\t\tProcess? ");
menu = j.nextLine();
if (menu.equals("x") || menu.equals("X")) {
System.exit(0);
}
if (menu.equals("SM") || menu.equals("sm")) {
do {
System.out.print("Student Number: ");
studentnumber = j.nextLine();
studentnumberA.add(studentnumber);
System.out.print("Student Name: ");
studentname = j.nextLine();
studentnameA.add(studentname);
System.out.print("Course : ");
course = j.nextLine();
courseA.add(course);
System.out.print("Prelim Grade: ");
prelim = j.nextDouble();
prelimA.add(prelim);
System.out.print("Midterm Grade: ");
midterm = j.nextDouble();
midtermA.add(midterm);
System.out.print("Finals Grade: ");
finals = j.nextDouble();
finalsA.add(finals);
j.nextLine();
System.out.println("Continue? (Y/N): ");
transaction = a.nextLine();
} while (transaction.equalsIgnoreCase("Y"));
}
if (menu.equalsIgnoreCase("sr")) {
do {
System.out
.println("\t\t\tDi Natuto University \n\t\t\t" +
"Pililla,Rizal \n\n\t\t\tStudent Summary Report" +
"\n\n\t\t\tSNo\tStudent no." +
"\n\t\t\tSna\tStudent Name \n\t\t\tCo\tCourse" +
"\n\t\t\tX\tExit \n\n\t\tProcess? ");
menu2 = j.nextLine();
System.out.println("\n");
if (menu2.equalsIgnoreCase("X")) {
System.exit(0);
}
if (menu2.equalsIgnoreCase("sno")) {
String[] array = studentnumberA
.toArray(new String[studentnumberA.size()]);
String[] array2 = studentnameA
.toArray(new String[studentnameA.size()]);
String[] array3 = courseA.toArray(new String[courseA
.size()]);
String[][] storeAllArray = { array, array2, array3 };
TreeMap<String, String> map = new TreeMap<String, String>();
TreeMap<String, String> map2 = new TreeMap<String, String>();
System.out
.println("\t\t\t\tDi Natuto University \n\t\t\t\t" +
"Pililla,Rizal \n\n\t\t\t\t" +
"Student Summary Report \n\n\t\t\tStudent no."
+ "Student Name\t\tCourse ");
for (int i = 0; i < array.length; i++) {
map2.put(array[i], array3[i]);
map.put(array[i], array2[i]);
}
for (String key : map.keySet())
System.out.println("\t\t\t" + key + "\t\t "
+ map.get(key) + "\t\t\t" + map2.get(key));
System.out.println("\n");
}
if (menu2.equalsIgnoreCase("sna")) {
String[] array = studentnumberA
.toArray(new String[studentnumberA.size()]);
String[] array2 = studentnameA
.toArray(new String[studentnameA.size()]);
String[] array3 = courseA.toArray(new String[courseA
.size()]);
String[][][] storeAllArray = { { array }, { array2 },
{ array3 } };
TreeMap<String, String> map = new TreeMap<String, String>();
TreeMap<String, String> map2 = new TreeMap<String, String>();
System.out
.println("\t\t\t\tDi Natuto University \n\t\t\t\t" +
"Pililla,Rizal \n\n\t\t\t\t" +
"Student Summary Report \n\n\t\t\tStudent no."
+ " Student Name" + "\tCourse ");
for (int i = 0; i < array.length; i++) {
map2.put(array2[i], array3[i]);
map.put(array2[i], array[i]);
}
for (String key : map.keySet())
System.out.println("\t\t\t" + map.get(key)
+ "\t\t " + key + "\t\t" + map2.get(key));
System.out.println("\n");
}
if (menu2.equalsIgnoreCase("co")) {
String[] array = studentnumberA
.toArray(new String[studentnumberA.size()]);
String[] array2 = studentnameA
.toArray(new String[studentnameA.size()]);
String[] array3 = courseA.toArray(new String[courseA
.size()]);
TreeMap<String, String> map = new TreeMap<String, String>();
TreeMap<String, String> map2 = new TreeMap<String, String>();
System.out
.println("\t\t\t\tDi Natuto University \n\t\t\t\t" +
"Pililla,Rizal \n\n\t\t\t\t" +
"Student Summary Report \n\n\t\t\tStudent no."
+ " Student Name" + "\tCourse ");
for (int i = 0; i < array.length; i++) {
map2.put(array3[i], array2[i]);
map.put(array3[i], array[i]);
}
for (String key : map.keySet())
System.out.println("\t\t\t" + map.get(key)
+ "\t\t " + map2.get(key) + "\t\t" + key);
System.out.println("\n");
}
System.out.print("Continue? (Y/N)");
transaction2 = j.nextLine();
} while (transaction2.equalsIgnoreCase("Y"));
}
if (menu.equalsIgnoreCase("sgr")) {
String[] array = studentnumberA
.toArray(new String[studentnumberA.size()]);
String[] array2 = studentnameA.toArray(new String[studentnameA
.size()]);
String[] array3 = courseA.toArray(new String[courseA.size()]);
Double[] array4 = prelimA.toArray(new Double[prelimA.size()]);
Double[] array5 = midtermA.toArray(new Double[midtermA.size()]);
Double[] array6 = finalsA.toArray(new Double[finalsA.size()]);
Double[] array7 = sumA.toArray(new Double[sumA.size()]);
String[][] storeAllArray = { array, array2, array3 };
TreeMap<Double, String> map = new TreeMap<Double, String>();
TreeMap<Double, String> map2 = new TreeMap<Double, String>();
TreeMap<Double, String> map3 = new TreeMap<Double, String>();
System.out
.println("\t\t\t\tDi Natuto University \n\t\t\t\t" +
"Pililla,Rizal \n\n\t\t\t\t" +
"Student Grade Report \n\n\t\t\tStudent no."
+ " Student Name"
+ "\tCourse"
+ "\t\t\tAverage");
for (int i = 0; i < array.length; i++) {
double sum = (array4[i] + array5[i] + array6[i]) / 3;
sumA.add(sum);
map.put(array7[i], array[i]);
map2.put(array7[i], array2[i]);
map3.put(array7[i], array3[i]);
}
for (Double key : map.keySet())
System.out.println("\t\t\t" + map.get(key) + "\t\t "
+ map2.get(key) + "\t\t" + map2.get(key) + "\t\t"
+ key);
System.out
.print("\n\n\t\t\tM\t\tMain Menu\n\t\t\tX\t\tExit\nChoice: ");
transaction3 = j.nextLine();
if (transaction3.equalsIgnoreCase("X")) {
System.out
.print("\t\t\t\tDi Natuto University \n\t\t\t\t" +
"Pililla,Rizal \n\n\t\t\t\t" +
"Thank you for using Di Natuto Grading System...");
System.exit(0);
}
}
} while (transaction.equalsIgnoreCase("N")
|| transaction2.equalsIgnoreCase("N")
|| transaction3.equalsIgnoreCase("M"));
}
}
import java.util.ArrayList；
导入java.util.List；
导入java.util.Scanner；
导入java.util.TreeMap；
公共班学生中心{
静态扫描仪j=新扫描仪（System.in）；
静态扫描仪a=新扫描仪（System.in）；
公共静态void main（字符串[]args）{
List studentnumberA=new ArrayList（）；
List studentnameA=new ArrayList（）；
List courseA=new ArrayList（）；
List prelimA=new ArrayList（）；
List midtermA=new ArrayList（）；
List finalsA=new ArrayList（）；
List sumA=new ArrayList（）；
双人预赛、期中赛、决赛；
字符串菜单，菜单2；
字符串transaction=null，transaction2=null，transaction3=null；
字符串studentname=null，course=null，studentnumber=null；
做{
System.out.print（“\t\t\tDi Natuto University\n\t\t\t”+
皮利亚，里扎尔\n\n\t\t\t+
“主菜单\n\t\tSM\t学生维护”+
“\n\t\tSR\t学生报告\n\t\tSGR\t”+
“学生成绩报告\n\t\tX\tExit\n\n\t\t过程？”）；
menu=j.nextLine（）；
if（menu.equals（“x”）| | menu.equals（“x”））{
系统出口（0）；
}
if（menu.equals（“SM”）| | menu.equals（“SM”））{
做{
系统输出打印（“学号：”）；
studentnumber=j.nextLine（）；
学生编号a.add（学生编号）；
系统输出打印（“学生姓名：”）；
studentname=j.nextLine（）；
studentnameA.add（studentname）；
系统输出打印（“课程：”）；
课程=j.nextLine（）；
课程a.添加（课程）；
系统输出打印（“预调等级：”）；
prelim=j.nextDouble（）；
预备。添加（预备）；
系统输出打印（“期中成绩：”）；
中期=j.nextDouble（）；
中期补充（中期）；
系统输出打印（“期末成绩：”）；
期末考试=j.nextDouble（）；
最后加上（总决赛）；
j、 nextLine（）；
系统输出打印项次（“是否继续”）；
事务=a.nextLine（）；
}而（交易同等信号情况（“Y”）；
}
if（菜单等信号情况（“sr”））{
做{
系统输出
.println（“\t\t\tDi Natuto University\n\t\t\t”+
Piilla，Rizal\n\n\t\t\t学生总结报告+
“\n\n\t\t\t\t学生号”+
“\n\t\t\tSna\t学生名\n\t\t\tCo\t课程”+
“\n\t\t\tX\tExit\n\n\t\t过程？”）；
menu2=j.nextLine（）；
System.out.println（“\n”）；
if（menu2.equalsIgnoreCase（“X”））{
系统出口（0）；
}
if（menu2.equalsIgnoreCase（“sno”））{
字符串[]数组=studentnumberA
.toArray（新字符串[studentnumberA.size（）]）；
字符串[]array2=studentnameA
.toArray（新字符串[studentnameA.size（）]）；
字符串[]数组3=courseA.toArray（新字符串[courseA
.size（））；
字符串[][]storeAllArray={array，array2，array3}；
TreeMap map=newtreemap（）；
TreeMap map2=新的TreeMap（）；
系统输出
.println（“\t\t\t\tDi Natuto University\n\t\t\t\t”+
皮利亚，里扎尔\n\n\t\t\t\t+
“学生总结报告\n\n\t\t\t学生编号。”
+“学生姓名\t\t课程”）；
for（int i=0；i studentnumber=j.nextLine();
studentnumberA.add(studentnumber);
System.out.println("\t\t\t"+map.get(key)+ "\t\t "+map2.get(key)+"\t\t"+map2.get(key)+"\t\t"+key);
public static void printStudent(String id, String name, String course, int key) {
System.out.println("\t\t\t"+ id + "\t\t "+ name +"\t\t"+ course +"\t\t" + key);
}
printStudent(map.get(key), map2.get(key), map2.get(key), key);