Question

java 两个按钮 事件

写一个界面 有两个按钮，一个文本框。按第一个按钮，文本框显示1，按第二个按钮，文本框显示2.
在线等。。。
zqkun 你的运行不起来耶，没main。能给我个直接能运行的吗？

Answer 1

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

class WindowUI implments {
JFrame frame;
JPanel panel;
JButton but1, but2;
JTextField tf;

public WIndowUI() {
frame = new JFrame("WindowUI");
JFrame.setDefaultLookAndFeelDecorated(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

panel = new JPanel(new GridLayout(0,1));
but1 = new JButton("Button1");
but1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
tf.setText("1");
}
});
but2 = new JButton("Button2");
but2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
tf.setText("2");
}
tf = new JTextField();
panel.add(but1);
panel.add(but2);
panel.add(tf);
frame.add(panel);
fame.setVisible(true);
frame.pack();
});
}
}

Answer 2

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class AwtEvent extends JFrame implements ActionListener { //文件名为:AwtEvent.java

private JButton but1, but2;
private JTextField text;

public AwtEvent() {

super("AwtEvent");
Container c = getContentPane();
c.setLayout(new FlowLayout());
text = new JTextField(10);
but1 = new JButton("1");
but2 = new JButton("2");

c.add(text);
c.add(but1);
c.add(but2);
setSize(300, 80);
setVisible(true);
validate();
but1.addActionListener(this);
but2.addActionListener(this);

}

public static void main(String[] args) {

new AwtEvent();

}

@Override
public void actionPerformed(ActionEvent e) {

if (e.getSource() == but1) {

text.setText("1");
} else if (e.getSource() == but2) {

text.setText("2");

}
}
}

Answer 3

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

import javax.swing.*;
public class ButtonAction {
private JFrame frame;
private JPanel panel;
private JButton b1,b2;
private JTextField t;
public ButtonAction(){
frame=new JFrame("按钮事件");
panel=new JPanel();
b1=new JButton("1");
b2=new JButton("2");
t=new JTextField(10);
b1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

t.setText("1");
}

});
b2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {
t.setText("2");

}

});
panel.add(t);
panel.add(b1);
panel.add(b2);
frame.getContentPane().add(panel);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);

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

}

Answer 4

这都要别人写，太对不起自己的学费了。