Swing程序设计实践与练习2

public class my1311text2 extends JFrame{
    private int i=0;
    private JComboBox<String> jc;
    private String[] test= {"红","黄","蓝","绿"};
    public static void main(String[] args) {
        new my1311text2();
    }
    public my1311text2() {
        jc=new JComboBox();
        JButton jb1=new JButton("add");
        setSize(200,100);
        setVisible(true);
        Container cp=getContentPane();
        cp.add(jc,BorderLayout.NORTH);
        cp.add(jb1,BorderLayout.SOUTH);
        jb1.addActionListener(new ActionListener() {
 
            @Override
            public void actionPerformed(ActionEvent arg0) {
                // TODO Auto-generated method stub
                
                if(i%4==0) {
                    i=0;
                    jc.removeAllItems();
                }
                jc.addItem(test[i]);
                i++;        
            }
            
        });
    }
    
}

原链接:https://blog.csdn.net/y786256773/article/details/80670084