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最新推荐文章于 2025-03-04 22:50:32 发布

原创最新推荐文章于 2025-03-04 22:50:32 发布 · 259 阅读

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本文介绍了一个使用 Java Swing 实现的消息面板示例，通过不同字体样式和背景颜色展示消息，并采用网格布局进行组织。

package animals;
import javax.swing.*;
import java.awt.Graphics;
import java.awt.*;
import java.awt.FontMetrics;
import java.awt.Dimension;
import java.awt.Graphics;
public class TestMessagePanel extends JFrame{
   public TestMessagePanel(){
       MessagePanel messagePanel1 = new MessagePanel("A");
       MessagePanel messagePanel2 = new MessagePanel("B");
       MessagePanel messagePanel3 = new MessagePanel("C");
       MessagePanel messagePanel4 = new MessagePanel("D");

       messagePanel1.setFont(new Font("SansSerif",Font.ITALIC,20));
       messagePanel2.setFont(new Font("Courier",Font.ITALIC,20));
       messagePanel3.setFont(new Font("Times",Font.ITALIC,20));
       messagePanel4.setFont(new Font("SansSerif",Font.ITALIC,20));

       messagePanel1.setBackground(Color.RED);
       messagePanel2.setBackground(Color.BLUE);
       messagePanel3.setBackground(Color.BLACK);
       messagePanel4.setBackground(Color.WHITE);

       messagePanel1.setCentered(true);
       setLayout(new GridLayout(2,2));//网格布局
       add(messagePanel1);
       add(messagePanel2);
       add(messagePanel3);
       add(messagePanel4);

   }
   public static void main(String[] args){
       TestMessagePanel frame = new TestMessagePanel();
       frame.setTitle(" TestMessage   ");
       frame.setSize(200, 200);
       frame.setLocationRelativeTo(null);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setVisible(true);
   }


}
class MessagePanel extends JPanel{
   private String message = "欢迎来到晋江文学城";
   private int xCoordinate = 20;
   private int yCoordinate = 20;
   private boolean centered;//居中
   int interval = 10;

   public MessagePanel(){

   }
   public MessagePanel(String message){
       this.message = message;
   }
   public void setMessage(String message){
       this.message = message;
       repaint();//重新绘制

   }
   public String getMessage(){
       return message;
   }
   public int getXCoordinate(){
       return xCoordinate;
   }
   public void setXCoordinate(int x){
       this.xCoordinate = x;
       repaint();
   }
   public int getYCoordinate(){
       return yCoordinate;
   }
   public void setYCoordinate(int y){
       this.yCoordinate = y;
       repaint();
   }
   public boolean isCentered(){
       return centered;
   }
   public void setCentered(boolean centered){
       this.centered = centered;
       repaint();
   }
   public int getInterval(){
       return interval;
   }
   public void setInterval(int interval){
       this.interval = interval;
       repaint();
   }
//   public void moveLeft(){
//       xCoordinate -= interval;
//       repaint();
//   }
//   public void moveRight(){
//       xCoordinate += interval;
//       repaint();
//   }
//   public void moveUp(){
//       yCoordinate -= interval;
//       repaint();
//   }
//   public void moveDown(){
//       yCoordinate += interval;
//       repaint();
//   }
   public Dimension getPreferredSize(){
       return new Dimension(200,30);
   }
   protected void paintComponent(Graphics g){
       super.paintComponent(g);

       if(centered){
           FontMetrics fm = g.getFontMetrics();

           int stringWidth = fm.stringWidth(message);
           int stringAscent = fm.getAscent();

           xCoordinate = getWidth()/2 - stringWidth/2;
           yCoordinate = getHeight()/2 + stringAscent/2;
       }
       g.drawString(message, xCoordinate, yCoordinate);
   }
}