一个JAVA问题定义两个中间容器――面板（JPanel）实例对象p和pp，其中pp做为组件加入到p中，使p的宽和高分别是

public class TestSwing extends JFrame {

public TestSwing() {
setTitle("test--jpanel");
setSize(400,300);

JPanel p = new JPanel();
p.setLayout(null);
p.setBounds(10, 10, 380, 280);
p.setBackground(Color.RED);

JPanel pp = new JPanel();
pp.setBounds(105, 70, 190, 140);
pp.setBackground(Color.BLUE);
p.add(pp);

add(p);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public static void main(String[] args) {
new TestSwing();
}
}