java此代码显示在单击按钮之前获得的焦点

Question

我希望GUI在用户单击按钮并 单击其他位置时“焦点丢失”。但它总是显示“获得了关注”

主代码：

import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import javax.swing.*;

public class focuslistener extends JFrame {

    private Container c;
    private JButton jb1;
    private Font f;
    private JTextArea ta1;

    focuslistener() {
        inticompo();
    }

    public void inticompo() {
        c = this.getContentPane();
        c.setBackground(Color.yellow);
        c.setLayout(null);
        f = new Font("Arial", Font.ITALIC + Font.BOLD, 18);
        jb1 = new JButton("Clicked");
        jb1.setBounds(50, 10, 250, 80);
        jb1.setForeground(Color.red);
        jb1.setBackground(Color.blue);

        jb1.setFont(f);

        c.add(jb1);

        ta1 = new JTextArea();
        ta1.setFont(f);
        ta1.setBounds(10, 110, 400, 300);
        ta1.setForeground(Color.black);
        ta1.setBackground(Color.red);

        c.add(ta1);
        jb1.addFocusListener(new FocusListener() {
            @Override
            public void focusGained(FocusEvent fe) {
                ta1.setText("focus Gained");
            }

            @Override
            public void focusLost(FocusEvent fe) {
                ta1.setText("focus Lost");
            }
        });
    }

    public static void main(String[] args) {
        focuslistener a = new focuslistener();
        a.setVisible(true);
        a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        a.setBounds(50, 100, 500, 500);
        a.setTitle("hello");
    }
}