Question

我正在尝试运行一个Java程序来显示9个输入框，请求姓名和考试分数，并在消息框中显示每个分数的名称和适当等级。我尝试过这样的事情：

import javax.swing.JOptionPane;
public class StudentGrade {
  public static void main(String[] args) {
    String inputname;
    String inputscore;
    int number;
    inputcourse = JOptionPane.showInputDialog("Enter name");
    inputscore = JOptionPane.showInputDialog("Enter score");
    number = Integer.parseInt(inputscore);
    if (number < 40){ 
      System.out.println ((inputcourse) + " " + "D"); }
    else if (number <50){
      System.out.println((inputcourse) + " " + "C");}
    else if (number <60){
      System.out.println((inputcourse) + " " + "B");}
    else System.out.println((inputcourse) + " " + "A");}
 }

但是，这只能运行一次。请问，如何让它运行九次？感谢。

Answer 1

要在控制结构中循环，您可以使用for，while循环或do-while循环。对于for循环，你应该尝试：

public class StudentGrade{
     public static void main(String[] args){
         for (int i=0; i<9; i++){ repeat 9 times
              // all the code you have in your main method now
         }
     }
}

对于while循环，您应该尝试：

public class StudentGrade{
     public static void main(String[] args){
         int i=0;
         while (i++ < 9){ //repeat 9 times
              // all the code you have in your main method now
         }
     }
}

对于do-while循环，您应该尝试：

public class StudentGrade{
     public static void main(String[] args){
          int i=1;
          do{ //repeat 9 times
             // all the code you have in your main method now
          }while (i++ < 9);
     }
}

希望这有帮助。

Answer 2

试试这个它会起作用。在您的代码中选中输入名称和输入课程 或将inputCourse更改为inputName

import javax.swing.JOptionPane;

public class world {
    public static void main(String[] args) {
        String inputname;
        String inputscore;
        int number;
        for(int i=0;i<9;i++){
            inputname = JOptionPane.showInputDialog("Enter name");
            inputscore = JOptionPane.showInputDialog("Enter score");
            number = Integer.parseInt(inputscore);
            if (number < 40){ 
               System.out.println ((inputname) + " " + "D");
            }else if (number <50){
               System.out.println((inputname) + " " + "C");
            }else if (number <60){
               System.out.println((inputname) + " " + "B");
            }else {
               System.out.println((inputname) + " " + "A");
            }
        }
    }
}

Answer 3

将代码放在for循环中：

 for(int i=0; i<9; i++){
     inputcourse = JOptionPane.showInputDialog("Enter name");
     inputscore = JOptionPane.showInputDialog("Enter score");
     number = Integer.parseInt(inputscore);
     if (number < 40){ 
         System.out.println ((inputcourse) + " " + "D");
     } else if (number <50){
         System.out.println((inputcourse) + " " + "C");
     } else if (number <60){
         System.out.println((inputcourse) + " " + "B");
     } else {
         System.out.println((inputcourse) + " " + "A");
     }
 }

我怎样才能使java程序重复运行

3 个答案: