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
直接选择排序算法：从待排序的数据元素集合中选取最小的元素放到原始数据的第一个元素的位置上。然后不包括第一个元素的数据元素集合中找到最小的元素放到此集合中，依次类推，即可完成排序。
算法实现如下：
/**
* 直接选择排序
* @param a 用于排序的数组
* */
public void ......
