Question

JAVA中怎么给下拉组件添加事件监听,使在下来菜单中所选的返回到文本组件中?

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Answer 1

你的程序我帮你改好了，你看看吧。
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class test_4 implements ItemListener{
String str[]={"目标","技能","经验悔闷衫","碧腔教育背景","证书罩迅"};
JTextField text=new JTextField(10);
JComboBox cbx=new JComboBox(str);
JFrame m=new JFrame("习题4");
test_4(){
Container c=m.getContentPane();
m.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
m.setSize(300,300);
m.setVisible(true);
//int i=0;
JPanel pnl=new JPanel();
JPanel pnl1=new JPanel();
pnl.setBackground(Color.yellow);
pnl.setSize(100, 100);
pnl.setLocation(5, 5);
c.add(pnl,BorderLayout.NORTH);
pnl1.setSize(110, 110);
pnl1.setBackground(Color.pink);
pnl1.setLocation(50, 50);
c.add(pnl1,BorderLayout.CENTER);
cbx.setSize(20, 20);
pnl.add(cbx);
text.setSize(100,100);
text.setHorizontalAlignment(JTextField.CENTER);
pnl1.add(text);
//cbx.addComponentListener(m);
cbx.addItemListener(this);
}
public static void main(String[] args) {
new test_4();
}
public void itemStateChanged(ItemEvent arg0) {
text.setText((String)cbx.getSelectedItem());
}
}

Answer 2

text.setText(cbx.getSelecteItem().toString())