?? exercise11_5.java
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import javax.swing.*;import java.awt.*;public class Exercise11_5 extends JFrame { public Exercise11_5() { MessagePanel m1 = new MessagePanel("Java"); MessagePanel m2 = new MessagePanel("HTML"); MessagePanel m3 = new MessagePanel("Tomcat"); MessagePanel m4 = new MessagePanel("PHP"); m1.setCentered(true); m2.setCentered(true); m3.setCentered(true); m4.setCentered(true); m1.setBackground(Color.white); m2.setBackground(Color.cyan); m3.setBackground(Color.red); m4.setBackground(Color.green); Font font = new Font("TimezRoman", Font.ITALIC, 14); m1.setFont(font); m2.setFont(font); m3.setFont(font); m4.setFont(font); JPanel p = new JPanel(new GridLayout(3, 1)); p.add(m2); p.add(m3); p.add(m4); getContentPane().add(m1, BorderLayout.CENTER); getContentPane().add(p, BorderLayout.EAST); } public static void main(String[] args) { Exercise11_5 frame = new Exercise11_5(); frame.setSize(400, 400); frame.setTitle("Exercise11_5"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }}?? 快捷鍵說明
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