Java 在地图中查找关键点
我正试图打印出在我的程序中测验分数最低的学生的名字 不幸的是，我没有找到一种使用getKey（）方法识别学生姓名的方法。我面临的问题在声明中：Java 在地图中查找关键点,java,loops,for-loop,do-while,Java,Loops,For Loop,Do While,我正试图打印出在我的程序中测验分数最低的学生的名字 不幸的是，我没有找到一种使用getKey（）方法识别学生姓名的方法。我面临的问题在声明中： else if (choice == 4) 任何帮助都将不胜感激 public class StudentQuizGrades { /** * @param args the command line arguments */ public static void main(String[] args) { Map<String,
else if (choice == 4)
public class StudentQuizGrades {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Map<String, Student> map = new HashMap<>();
addStudent(map);
}
private static void addStudent(Map<String, Student> map) {
Scanner userInput = new Scanner(System.in);
Set<String> keySet = map.keySet();
boolean finish = false;
int studentID = 0;
do {
System.out.println("Please choose an option: ");
System.out.println("Add student and quizzes - 1, Get all quiz scores - 2, Get highest quiz score- 3, ");
System.out.println("Get lowest quiz score - 4, Get class average - 5, Quit - 6");
int choice = userInput.nextInt();
if (choice == 1) {
System.out.println("How many students would you like to add?");
int numberOfStudents = userInput.nextInt();
for (int counter = 0; counter < numberOfStudents; counter++) {
System.out.println("ENTER NAME");
Scanner addName = new Scanner(System.in);
String name = (addName.nextLine());
System.out.println("Enter First Quiz Score");
Scanner addQuiz1 = new Scanner(System.in);
int quiz1 = (addQuiz1.nextInt());
System.out.println("Enter Second Quiz Score");
Scanner addQuiz2 = new Scanner(System.in);
int quiz2 = (addQuiz2.nextInt());
System.out.println("Enter Third Quiz Score");
Scanner addQuiz3 = new Scanner(System.in);
int quiz3 = (addQuiz3.nextInt());
Student student = new Student(name, quiz1, quiz2, quiz3);
map.put(student.getKey(), student);
}
} else if (choice == 2) {
for (String currentKey : keySet) {
Student student = map.get(currentKey);
System.out.println(currentKey);
System.out.println(Arrays.toString(student.getQuizGrades()));
}
} else if (choice == 3) {
int max = 0;
for (String currentKey : keySet) {
Student student = map.get(currentKey);
int[] scores = student.getQuizGrades();
for (int counter = 1; counter < scores.length; counter++) {
if (scores[counter] > max) {
max = scores[counter];
}
}
}
System.out.println("The highest quiz score was " + max);
} else if (choice == 4) {
int min = 0;
for (String currentKey : keySet) {
Student student = map.get(currentKey);
int[] scores = student.getQuizGrades();
int index = 0;
min = scores[0];
for (int counter = 1; counter < scores.length; counter++) {
if (scores[counter] < min) {
min = scores[counter];
index = counter;
}
}
studentID = index;
}
System.out.println("The lowest quiz score was " + min );
} else if (choice == 5) {
int[] allGrades;
int sum = 0;
int counter2 = 0;
for (String currentKey : keySet) {
Student student = map.get(currentKey);
int[] scores = student.getQuizGrades();
for (int counter = 0; counter < scores.length; counter++) {
int j = scores[counter];
sum = sum + j;
counter2++;
}
}
int average = sum / counter2;
System.out.println("The class average is: " + average);
} else if (choice == 6) {
finish = true;
break;
}
} while (finish == false);
}
}
public class Student {
private String key;
private int grade1;
private int grade2;
private int grade3;
public Student(String key, int grade1, int grade2, int grade3){
this.key = key;
this.grade1 = grade1;
this.grade2 = grade2;
this.grade3 = grade3;
}
public String getKey(){
return key;
}
public int[] getQuizGrades(){
int [] anArray = {grade1, grade2, grade3};
return anArray;
}
public int getAverageScore(){
int average = (grade1 + grade2 + grade3)/3;
return average;
}
}
public class StudentQuizGrades{
/**
*@param指定命令行参数
*/
公共静态void main（字符串[]args）{
Map Map=newhashmap（）；
addStudent（地图）；
}
私有静态void addStudent（地图）{
扫描仪用户输入=新扫描仪（System.in）；
Set keySet=map.keySet（）；
布尔完成=假；
int studentID=0；
做{
System.out.println（“请选择一个选项：”）；
println（“添加学生和测验-1，获得所有测验分数-2，获得最高测验分数-3，”）；
println（“获得最低测验分数-4，获得班级平均分数-5，退出-6”）；
int choice=userInput.nextInt（）；
如果（选项==1）{
System.out.println（“您希望添加多少学生？”）；
int numberOfStudents=userInput.nextInt（）；
for（int counter=0；counter最大值）{
最大值=分数[计数器]；
}
}
}
System.out.println（“最高测验分数为”+max）；
}else if（选项==4）{
int min=0；
用于（字符串currentKey:keySet）{
学生=map.get（currentKey）；
int[]分数=student.getQuizGrades（）；
int指数=0；
最小值=分数[0]；
对于（int counter=1；counter 字符串类型else if (choice == 4) {
Set<String> keySet = map.keySet(); //you should get keySet at here rather as your code for it maybe out date after 1 adding
int min = Integer.MAX_VALUE;//
String minName = null;///used to store the name of lowest
for (String currentKey : keySet) {
Student student = map.get(currentKey);
int[] scores = student.getQuizGrades();
for (int counter = 0; counter < scores.length; counter++) {//begin with 0 not 1 as your code
if (scores[counter] < min) {
minName = currentKey;//store name
min = scores[counter];
}
}
}
System.out.println("The lowest quiz score was " + min + "his/her name is" + minName);
}
else if（选项==4）{
Set keySet=map.keySet（）；//您应该在此处获取keySet，因为您的代码在添加1之后可能过期
int min=整数。最大值；//
String minName=null；///用于存储最小值的名称
用于（字符串currentKey:keySet）{
学生=map.get（currentKey）；
int[]分数=student.getQuizGrades（）；
对于（int counter=0；counter字符串类型else if (choice == 4) {
Set<String> keySet = map.keySet(); //you should get keySet at here rather as your code for it maybe out date after 1 adding
int min = Integer.MAX_VALUE;//
String minName = null;///used to store the name of lowest
for (String currentKey : keySet) {
Student student = map.get(currentKey);
int[] scores = student.getQuizGrades();
for (int counter = 0; counter < scores.length; counter++) {//begin with 0 not 1 as your code
if (scores[counter] < min) {
minName = currentKey;//store name
min = scores[counter];
}
}
}
System.out.println("The lowest quiz score was " + min + "his/her name is" + minName);
}
else if（选项==4）{
Set keySet=map.keySet（）；//您应该获得密钥