Java Swing；单击按钮后如何显示文本 [英] Java Swing; how to show text after button is clicked

问题描述

我想要世界你好！"在单击我的按钮时显示. 因此，请转到同一窗口中的下一个框架"！ 我尝试了卡片布局，但是谁能告诉我如何使用此代码；

I want 'Hello world!' to show when my button is clicked. So go to a next 'frame' but in the same window! I tried card lay-out, but can any one tell me how to do it with this code;

我在这段代码中做错了什么?

What am i doing wrong in this code?

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JOptionPane;



public class myTest{

public static void main(String[] args){

JPanel panel = new JPanel();

JButton button1 = new JButton();

frame.add(panel);
panel.add(button1);

  button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
        JOptionPane.showMessageDialog(null, "Hello World");

            }
        });

}

}

推荐答案

尝试使用代码:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JOptionPane;

public class myTest {

    public static void main(String[] args) {

        final JFrame frame = new JFrame();
        JPanel panel = new JPanel();

        JButton button1 = new JButton();

        frame.add(panel);
        panel.add(button1);
        frame.setVisible(true);

        button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                JOptionPane.showMessageDialog(frame.getComponent(0), "Hello World");

            }
        });

    }

}

它按预期工作.

或者，如果您希望邮件位于同一框架上，请尝试使用此代码.

OR if you want the message to be on the same Frame then try with this code.

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.JOptionPane;
import javax.swing.JPanel;

public class myTest {

    public static void main(String[] args) {

        final JFrame frame = new JFrame();
        JPanel panel = new JPanel();

        JButton button1 = new JButton();

        final JLabel label = new JLabel("Hello World");

        label.setVisible(false);
        frame.add(panel);
        panel.add(button1);
        panel.add(label);
        frame.setVisible(true);

        button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                //JOptionPane.showMessageDialog(frame.getComponent(0), "Hello World");
                label.setVisible(true);
            }
        });

    }

}

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