关于Java的语句意思问题

Question

public class ClickButton extends JFrame {
private JPanel jp=new JPanel();

private JButton jb1=new JButton("jb1");
private JButton jb2=new JButton("jb2");
private JButton jb3=new JButton("jb3");
private JButton[] jb=new JButton[]{jb1,jb2,jb3};
private JLabel jl=new JLabel("label");

private int count=0;
public ClickButton(){
    for(int i=0;i<jb.length;i++){
        jp.add(jb[i]);
    }
    jp.add(jl);
    this.add(jp);
    this.setTitle("good,actionlistener");

    for(int i=0;i<jb.length;i++){
        jb[i].addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                if(e.getSource()==jb1)
                    ClickButton.this.jl.setText("点击了按钮1，合计"+(++count)+"次");
                if(e.getSource()==jb2)
                        ClickButton.this.jl.setText("点击了按钮2，合计"+(++count)+"次");
                if(e.getSource()==jb3){
                            ClickButton.this.jl.setText("点击了按钮3，合计"+(++count)+"次");
                }
            }
        });
    }

    this.setBounds(200, 200, 200, 20);
    this.setVisible(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}


/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub
    new ClickButton();
}

}

[color=red][size=x-large]其中ClickButton.this.jl.setText是什么意思，请麻烦详细讲一下，谢谢[/size][/color]

Answer 1

JLabel jl=new JLabel("label");就是让标签显示你的文本，其中this就是只的JFrame