Inkonsistentes Display, wenn ein Java -Swing -Programm ausgeführt wird ⇐ Java

[Anonymous]

Ich bin relativ neu in Java (insbesondere Swing) und verwende Bluej IDE für einige grundlegende Swing -Programme. In diesen Fällen werden die Komponenten plötzlich angezeigt, wenn ich das Fenster maximiere oder ziehe und seine Größe erhöht. Was passiert und wie kann ich es verhindern?

Code: Select all

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Swing16 {
public static void main() {
JFrame frame1 = new JFrame("TESTING");

frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setVisible(true);
frame1.setSize(1000, 700);
frame1.setLocation(200, 100);
// frame1.setResizable(false);

frame1.setLayout(null);

JPanel pan1 = new JPanel();
pan1.setBackground(Color.green);
pan1.setBounds(0, 0, 900, 600);
frame1.add(pan1);

pan1.setLayout(null);

JButton east = new JButton("East");
JButton west = new JButton("West");
JButton north = new JButton("North");
JButton south = new JButton("South");

Color cr1 = new Color(0, 127, 0);
Font ft1 = new Font("impact", Font.BOLD, 25);

north.setForeground(Color.white);
north.setBackground(cr1);

south.setForeground(Color.white);
south.setBackground(cr1);

east.setForeground(Color.white);
east.setBackground(Color.blue);
east.setFont(ft1);
east.setToolTipText(" This is the EAST zone");

west.setForeground(Color.white);
west.setBackground(Color.blue);
west.setFont(ft1);
west.setToolTipText(" This is the WEST zone");

JLabel lb1 = new JLabel(" Label 1 ");

JLabel lb2 = new JLabel(" Label 2 ");
lb2.setOpaque(true);
lb2.setForeground(Color.white);
lb2.setBackground(Color.black);
lb2.setFont(ft1);

JTextField tf1 = new JTextField(" TextField1");
tf1.setForeground(Color.white);
tf1.setBackground(Color.black);
tf1.setFont(ft1);
// tf1.selectAll();

JTextField tf2 = new JTextField("TextField 2");
// tf2.getFocus();

JTextArea ta1 = new JTextArea("Enter TA", 5, 30);
ta1.setForeground(Color.white);
ta1.setBackground(Color.black);
// ta1.setFont(ft1);

east.setBounds(400, 200, 80, 100);
pan1.add(east);

west.setBounds(20, 200, 80, 100);
pan1.add(west);

north.setBounds(200, 10, 100, 80);
pan1.add(north);

south.setBounds(200, 510, 100, 80);
pan1.add(south);

lb1.setBounds(0, 0, 100, 50);
pan1.add(lb1);
lb2.setBounds(0, 80, 100, 50);
pan1.add(lb2);

tf1.setBounds(10, 350, 80, 30);
pan1.add(tf1);
tf2.setBounds(10, 500, 80, 30);
pan1.add(tf2);

ta1.setBounds(400, 10, 100, 180);
pan1.add(ta1);
}
}