用Java编写一个5x5的正方形
实验代码:
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
public class FiveXFive extends JFrame {
public static void main(String[] args) {
FiveXFive f = new FiveXFive();
f.launchFrame();
}
public void launchFrame() {
// The width & Height of the window
final int formWidth = 500;
final int formHeight = 500;
// The width & Height of the screen
int screenWidth = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
int screenHeight = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
// Set title, size, location & visible
this.setTitle("Hello World! I'm coming!");
// width + left + right, height + top + bottom
this.setSize(formWidth+8+8, formHeight+31+8);
// set window in the middle
this.setLocation((screenWidth-formWidth)/2, (screenHeight-formHeight)/2);
this.setVisible(true);
Insets insets = this.getInsets();
System.out.println("top: " + insets.top);
System.out.println("bottom: " + insets.bottom);
System.out.println("left: " + insets.left);
System.out.println("right: " + insets.right);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void paint(Graphics g) {
g.drawLine(8, 31, 508, 531);
g.drawLine(8, 531, 508, 31);
for (int y = 31; y < (500+31); y += 100) {
for (int x = 8; x < (500+8); x += 100) {
g.drawRect(x, y, 100, 100);
}
}
}
}
实验结果: