testrect.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// TestRect.java: Demonstrate drawing rectangles
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class TestRect extends JFrame
{
  // Default constructor
  public TestRect()
  {
    setTitle("Show Rectangles");
    getContentPane().add(new RectPanel());
  }

  // Main method
  public static void main(String[] args)
  {
    TestRect frame = new TestRect();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300,250);
    frame.setVisible(true);
  }
}

class RectPanel extends JPanel
{
  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);

    // Set new color
    g.setColor(Color.red);
    
    // Draw a rectangle
    g.drawRect(30, 30, 100, 100);

    // Draw a rounded rectangle
    g.drawRoundRect(140, 30, 100, 100, 60, 30);

    // Change the color to cyan
    g.setColor(Color.cyan);

    // Draw a 3D rectangle
    g.fill3DRect(30, 140, 100, 100, true);

    // Draw a raised 3D rectangle
    g.fill3DRect(140, 140, 100, 100, false);
  }
}