showjcombobox.java

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import javax.swing.JFrame;
import java.awt.FlowLayout;
import javax.swing.JLabel;
import javax.swing.JComboBox;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JButton;
class ShowJComboBox extends JFrame implements ActionListener{
	FlowLayout flowLayout1=new FlowLayout();
	JLabel jLabel1=new JLabel("联赛名称:");
	JLabel jLabel2=new JLabel("球队名称:");
	JComboBox jComboBox1=new JComboBox();
	JComboBox jComboBox2=new JComboBox();
	JButton jButton1=new JButton("确认");
	ShowJComboBox(){
		super("组合框示例");
		setSize(200,150);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.getContentPane().setLayout(flowLayout1);
		this.getContentPane().add(jLabel1);
		jComboBox1.addItem("英超联赛");
		jComboBox1.addItem("西甲联赛");
		this.getContentPane().add(jComboBox1);
		this.getContentPane().add(jLabel2);
		jComboBox2.addItem("阿仙奴");
		jComboBox2.addItem("曼联");
		jComboBox2.addItem("车路士");
		this.getContentPane().add(jComboBox2);
		jComboBox1.addActionListener(this);
		this.getContentPane().add(jButton1);
		jButton1.addActionListener(this);
		show();
	}
	public void actionPerformed(ActionEvent e){
		if(e.getSource()==jComboBox1){
			int sel_index=jComboBox1.getSelectedIndex();
			switch(sel_index){
				case 0:
					jComboBox2.removeAllItems();
					jComboBox2.addItem("阿仙奴");
					jComboBox2.addItem("曼联");
					jComboBox2.addItem("车路士");
					break;
				case 1:
					jComboBox2.removeAllItems();
					jComboBox2.addItem("皇家马德里");
					jComboBox2.addItem("巴塞罗纳");
					break;
			}
		}
		if(e.getSource()==jButton1){
			String sel_item1=(String)jComboBox1.getSelectedItem();
			String sel_item2=(String)jComboBox2.getSelectedItem();
			System.out.println(sel_item1+":"+sel_item2);
		}
	}
	public static void main(String[] args){
		ShowJComboBox showJComboBox1=new ShowJComboBox();
	}
}