Java 常用动作事件监听
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class guess extends JFrame{
public guess(){
setDefaultCloseOperation(EXIT_ON_CLOSE);
setBounds(500,200,500,120);
Container c = getContentPane();
JPanel centerP = new JPanel();//JPanel 是轻量级容器
centerP.setLayout(new FlowLayout());
c.add(centerP,BorderLayout.CENTER);
JPanel southP = new JPanel();
JLabel console = new JLabel("点击组件");
southP.add(console);
c.add(southP, BorderLayout.SOUTH);
JButton btn = new JButton("按钮");
centerP.add(btn);
btn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
console.setText("按钮被点击");
}
});
JTextField it = new JTextField(10);//构造指定10列的新的JTextField
centerP.add(it);
it.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
//动作事件可以捕捉是由谁触发
Object object = e.getSource();
JTextField jTextField = (JTextField) object;
System.out.println(jTextField.getText());
console.setText("文本框中点击了回车");
}
});
JCheckBox jCheckBox = new JCheckBox("多选框");
centerP.add(jCheckBox);
jCheckBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
console.setText("多选框被点击");
}
});
JRadioButton jRadioButton = new JRadioButton("单选框");
centerP.add(jRadioButton);
jRadioButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
console.setText("单选框被点击");
}
});
String val[] = {"单选1", "单选2", "单选3"};
JComboBox jComboBox = new JComboBox(val);
centerP.add(jComboBox);
jComboBox.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
console.setText("下拉列表被选择");
}
});
}
public static void main(String[] args) {
new guess().setVisible(true);
}
}