Question

Java的新手，似乎无法找到答案（即使在搜索到处之后）。我想在程序中添加“提交”，“清除”和“退出”按钮，但似乎无法弄清楚如何。我想提交以替换当前的“确定”按钮，退出以替换当前的“取消”按钮，并清除以清除所有输入的整数。请参阅以下代码：

这是主要的。

import java.util.Scanner;
import javax.swing.JOptionPane;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;



class TestScoresApp {
    public static void main (String args[]) throws Exception {
        Scanner kb = new Scanner (System.in);

    while(true) {
    boolean flag = false;
    int array[] = new int[3];
    String strInput;
    System.out.println("Please Enter TestScores");



    for(int i=0;i<3;i++)
        //strInput = JOptionPane.showInputDialog(null, "Enter Score:");
        array[i] = Integer.parseInt(JOptionPane.showInputDialog("Enter Number:"));
        //array[i]=kb.nextInt();
    try
    {
        TestScores t1 = new TestScores(array);
    }
    catch (InvalidTestScores e)
    {
        System.out.println(e.getMessage());
        flag = true;
}
if (flag == false )
    break;
else
    System.out.println("Invalid, input your scores again.");
}
        System.exit(0);
}
}

TestScores类

class TestScores {
    private int scores[] = new int[3];
    public TestScores (int test[]) throws InvalidTestScores {
        for (int i=0;i<3;i++) {
            if (test[i]<0 || test[i]>100)
                throw new InvalidTestScores (test[i]);
            else
                scores[i]=test[i];
        }

        System.out.println("Average is:"+Average());
    }
    public double Average() {
        double sum = 0;
        double avg;
        for(int i=0;i<3;i++) {
            sum += scores[i];
        }
        avg = sum / 3;
        return avg;
    }
}

异常

class InvalidTestScores extends Exception {
    public InvalidTestScores (int n) {
        super("Error:Number cannot be less than 0 and greater than 100 i.e " +n);
    }
}

Answer 1

要重命名按钮，您应该使用JOptionPane的另一种方法，其参数如下：

Object[] options = { "Submit", "Cancel" }; array[i] = = JOptionPane.showOptionDialog(null, "Enter number: ", "Title", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null, options, options[0]);

要添加新的“清除”按钮，请使用以下构造：

    final JButton clr= new JButton("Clear");
    clr.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
        // button implementation
        }
    });

有关详细信息，请参阅此问题：ActionListener on JOptionPane

将Submit，Clear和Exit按钮添加到Java循环中

1 个答案: