import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Terris extends JFrame implements Runnable, KeyListener {
private short isPlaying=0,xOffSet = 2, yOffSet = 0, blockType = (short) Math.round(Math.random() * 6), blockRotation = 0, blockColor = (short) Math.round(Math.random() * 5);
private short matrix[][] = new short[21][10];//
private short block[][][][] = {{{ { 0, 1, 0, 0 }, { 0, 1, 0, 0 }, { 0, 1, 0, 0 },{ 0, 1, 0, 0 } },/* l */{ { 0, 0, 0, 0 }, { 1, 1, 1, 1 }, { 0, 0, 0, 0 },{ 0, 0, 0, 0 } } },/*-*/{{ { 0, 0, 0, 0 }, { 1, 1, 0, 0 }, { 0, 1, 1, 0 },{ 0, 0, 0, 0 } },/* z */{ { 0, 0, 0, 0 }, { 0, 0, 1, 0 }, { 0, 1, 1, 0 },{ 0, 1, 0, 0 } } },/* z| */{{ { 0, 0, 0, 0 }, { 0, 1, 1, 0 }, { 1, 1, 0, 0 },{ 0, 0, 0, 0 } },/* xz */{ { 0, 1, 0, 0 }, { 0, 1, 1, 0 }, { 0, 0, 1, 0 },{ 0, 0, 0, 0 } } },/* xz| */{ { { 0, 0, 0, 0 }, { 0, 1, 1, 0 }, { 0, 1, 1, 0 }, { 0, 0, 0, 0 } } },/** []*/{{ { 0, 1, 1, 0 }, { 0, 1, 0, 0 }, { 0, 1, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 0, 0, 0 }, { 1, 1, 1, 0 }, { 0, 0, 1, 0 },{ 0, 0, 0, 0 } },{ { 0, 1, 0, 0 }, { 0, 1, 0, 0 }, { 1, 1, 0, 0 },{ 0, 0, 0, 0 } },{ { 1, 0, 0, 0 }, { 1, 1, 1, 0 }, { 0, 0, 0, 0 },{ 0, 0, 0, 0 } } },/* f */{{ { 1, 1, 0, 0 }, { 0, 1, 0, 0 }, { 0, 1, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 0, 1, 0 }, { 1, 1, 1, 0 }, { 0, 0, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 1, 0, 0 }, { 0, 1, 0, 0 }, { 0, 1, 1, 0 },{ 0, 0, 0, 0 } },{ { 0, 0, 0, 0 }, { 1, 1, 1, 0 }, { 1, 0, 0, 0 },{ 0, 0, 0, 0 } } },/* xf */ {{ { 0, 1, 0, 0 }, { 1, 1, 1, 0 }, { 0, 0, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 1, 0, 0 }, { 0, 1, 1, 0 }, { 0, 1, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 0, 0, 0 }, { 1, 1, 1, 0 }, { 0, 1, 0, 0 },{ 0, 0, 0, 0 } },{ { 0, 1, 0, 0 }, { 1, 1, 0, 0 }, { 0, 1, 0, 0 },{ 0, 0, 0, 0 } } } };/* t */
private Image[] images = {new ImageIcon("D:/Java/eclipse/workspace/Terris/src/img/Red.gif").getImage(),new ImageIcon("D:/Java/eclipse/workspace/Terris/src/img/Blue.gif").getImage(),new ImageIcon(("D:/Java/eclipse/workspa
java.lang.Object 提供了一个toString()的方法，但实际上这个方法返回的往往不是我们需要的，它返回的是类名加上“@”加上十六进制的hash值。这显然不是我们想要的，所以必须重载toString函数。
很简单的例子，如下
System.out.println("Failed to connect: " + phoneNumber);
如果不重载，则有
Failed to co ......
