java - 检查和交换按钮？ GUI [有相应的操作命令吗？]

Question

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class test extends JFrame implements ActionListener {


public test() {

super("Checker and Swapper");

getContentPane().setLayout(new FlowLayout());

JTextField textField1 = new JTextField(15);
JButton check = new JButton("CHECK");
check.setActionCommand("check");



JTextField textField2 = new JTextField(15);
JButton swap = new JButton ("SWAP");
swap.setActionCommand("swap");


check.addActionListener(this);
swap.addActionListener(this);


getContentPane().add(textField1);
getContentPane().add(check);
getContentPane().add(textField2);
getContentPane().add(swap);


setSize(300, 170);
setVisible(true);
}

public void actionPerformed( ActionEvent e)
{
    // i don't know what to put here
}


public static void main(String args[]) {
  new test();
}
}

所以我试图制作一个图形用户界面，如果我单击“检查”按钮，它将检查两个文本字段上的字符串是否相同，然后在下部显示的标签是相同的，然后如果我单击交换它将交换两个字符串。

我是 gui 的初学者。谁能帮我吗？

谢谢(:

This is what I already have expect for action for the button.

Answer 1

根据您的代码，现在它使用 JOPtionPane 创建一个弹出窗口，如果您需要标签，只需使用 JLabel lblname = new JLabel() 并将其添加到框架中，并通过调用 lblname.setText("text"); 设置标签文本；

public class test extends JFrame {

public test() {

this.setTitle("Checker and Swapper");
getContentPane().setLayout(new FlowLayout());

JTextField textField1 = new JTextField(15);
JButton check = new JButton("CHECK");
check.setActionCommand("check");

JTextField textField2 = new JTextField(15);
JButton swap = new JButton ("SWAP");
swap.setActionCommand("swap");

check.addActionListener(new ActionListener()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
      if(textField1.getText().equals(textField2.getText()))
      {
        JOptionPane.showMessageDialog(null, "Both Texts are equal");
      }
    }
});

swap.addActionListener(new ActionListener()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
      String temporary = textField1.getText();
      textField1.setText(textField2.getText());
      textField2.setText(temporary);
    }
});


getContentPane().add(textField1);
getContentPane().add(check);
getContentPane().add(textField2);
getContentPane().add(swap);


setSize(300, 170);
setVisible(true);
}