Java考试题之swt组件

listener).setJTextField(text_1,text_2,text_3,button); }

}

text_2.addActionListener(listener); button.addActionListener(listener); setVisible(true); validate();

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//ReadListener.java

package com.example.test;

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

import javax.swing.JButton; import javax.swing.JTextField;

public class ReadListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

double a, b; try {

a = Double.parseDouble(text_1.getText()); b = Double.parseDouble(text_2.getText()); if (e.getSource() == text_2) { }

if (e.getSource() == button) { }

text_3.setText(String.valueOf(a - b)); text_3.setText(String.valueOf(a + b));

public void setJTextField(JTextField text_1, JTextField text_2, }

JTextField text_3, JButton button) { this.text_1 = text_1; this.text_2 = text_2; this.text_3 = text_3; this.button = button;

JTextField text_1, text_2, text_3; JButton button;

}

}

} catch (Exception e2) { }

text_3.setText(\请输入合法数字\);

//Main.class

package com.example.test;

public class Main { }

}

public static void main(String[] args) {

WindowsActionEvent wae=new WindowsActionEvent();