Java 示例 - 在矩形中显示文本

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  问题描述

  如何在矩形中显示字符串？
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  解决方案

  下面的示例演示如何通过使用 drawRect() 方法在每个字符周围绘制一个矩形来显示矩形中的每个字符。

  
  import java.awt.*;
  import javax.swing.*;
  public class Main extends JPanel {
     public void paint(Graphics g) {
        g.setFont(new Font("",0,100));
        FontMetrics fm = getFontMetrics(new Font("",0,100));
        String s = "message";
        int x = 5;
        int y = 5;
        
        for (int i = 0; i < s.length(); i++) {
           char c = s.charAt(i);
           int h = fm.getHeight();
           int w = fm.charWidth(c);
           
           g.drawRect(x, y, w, h);
           g.drawString(String.valueOf(c), x, y + h);
           x = x + w;
        }
     }
     public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new Main());
        frame.setSize(500, 700);
        frame.setVisible(true);
     }
  }
  

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  结果

  上面的代码示例将产生以下结果。

  
  Each character is displayed in a rectangle. 
  

  下面是另一个在矩形中显示字符串的示例。

  
  import java.awt.Color;
  import java.awt.Graphics;
  import javax.swing.JComponent;
  import javax.swing.JFrame;
  class MyCanvas extends JComponent {
     String s = "message";
     int x = 45;
     int y = 45;
     public void paint(Graphics g) {
        g.drawRect (10, 10, 200, 200);
        g.setColor(Color.red);
        g.drawString(s, x, y);
     }
  }
  public class Panel {
     public static void main(String[] a) {
        JFrame window = new JFrame();
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setBounds(30, 30, 300, 300);
        window.getContentPane().add(new MyCanvas());
        window.setVisible(true);
     }
  }
  

  上面的代码示例将产生以下结果。

  
  Each character is displayed in a rectangle.