本文主要是介绍一个关于随机数类Random的小小游戏，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
以前一直觉得Random类的方法一般是生成一个“随机”数，细想之下，这似乎与计算机的确定性相违背。后来在API文档上查阅才发现，此“随机”乃是“伪随机”，但到底是怎么个“伪”还是不清楚。今天做了一个小小程序，发现了一些有趣的事情
package 小游戏;
/*** 这是一个验证Random随机数的小游戏界面类*/import java.awt.FlowLayout;
import java.awt.Graphics;import javax.swing.JButton;
import javax.swing.JFrame;public class gameUI extends JFrame{public static void main(String args[]){gameUI gu = new gameUI();gu.init();} public void init(){this.setTitle("小游戏");this.setSize(500, 500);FlowLayout fl = new FlowLayout();this.setLayout(fl);JButton jb =new JButton("开始随机数游戏");this.add(jb);JButton jbg = new JButton("开始高斯随机数游戏");this.add(jbg);this.setDefaultCloseOperation(3);this.setVisible(true);Graphics g = this.getGraphics();gameListener glis = new gameListener(g);jb.addActionListener(glis);gamegListener gglis = new gamegListener(g);jbg.addActionListener(gglis);}
}
package 小游戏;
/*** 小游戏的监听器类(生成一般随机数)*/import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;public class gameListener implements ActionListener{private Graphics g;private int x1,x2,x3,y1,y2,y3;private int x,y;//重写监听器类的构造器方法public gameListener(Graphics g){this.g = g;}public void actionPerformed(ActionEvent e) {Random r = new Random(); //Random是一个生成伪随机数的类x1 = Math.abs(r.nextInt()%500); //生成0到499之间的随机数（伪）x2 = Math.abs(r.nextInt()%500);x3 = Math.abs(r.nextInt()%500);y1 = Math.abs(r.nextInt()%500);y2 = Math.abs(r.nextInt()%500);y3 = Math.abs(r.nextInt()%500);System.out.println("x1:"+x1+" x2:"+x2+" x3:"+x3+" y1:"+y1+" y2:"+y2+" y3:"+y3);x = Math.abs(r.nextInt()%500);y = Math.abs(r.nextInt()%500);g.drawLine(x1, y1, x1, y1);g.drawLine(x2, y2, x2, y2);g.drawLine(x3, y3, x3, y3);g.drawLine(x, y, x, y);for(int i =1;i<1000000;i++){int P = getP();getColor();//若随机数为1，则if(P==1){x = (x1+x)/2;y = (y1+y)/2;g.drawLine(x, y, x, y);}//若随机数为2，则else if(P==2){x = (x2+x)/2;y = (y2+y)/2;g.drawLine(x, y, x, y);}//若随机数为3，则else if(P==3){x = (x3+x)/2;y = (y3+y)/2;g.drawLine(x, y, x, y);}}}//随机取1,2,3中的一个数public int getP(){Random r = new Random();int P = Math.abs(r.nextInt()%3);return P+1;}public void getColor(){Random r = new Random();int P = Math.abs(r.nextInt()%10);int C = P+1;if(C==1){g.setColor(config.c1);}else if(C==2){g.setColor(config.c2);}else if(C==3){g.setColor(config.c3);}else if(C==4){g.setColor(config.c4);}else if(C==5){g.setColor(config.c5);}else if(C==6){g.setColor(config.c6);}else if(C==7){g.setColor(config.c7);}else if(C==8){g.setColor(config.c8);}else if(C==9){g.setColor(config.c9);}else if(C==10){g.setColor(config.c10);}else if(C==11){g.setColor(config.c11);}}}
package 小游戏;
/*** 小游戏的监听器类（生成高斯随机数）*/import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;public class gamegListener implements ActionListener{private Graphics g;private int x1,x2,x3,y1,y2,y3;private int x,y;//重写监听器类的构造器方法public gamegListener(Graphics g){this.g = g;}public void actionPerformed(ActionEvent e) {Random r = new Random(); //Random是一个生成伪随机数的类x1 = Math.abs(r.nextInt()%500); //生成0到499之间的随机数（伪）x2 = Math.abs(r.nextInt()%500);x3 = Math.abs(r.nextInt()%500);y1 = Math.abs(r.nextInt()%500);y2 = Math.abs(r.nextInt()%500);y3 = Math.abs(r.nextInt()%500);System.out.println("x1:"+x1+" x2:"+x2+" x3:"+x3+" y1:"+y1+" y2:"+y2+" y3:"+y3);x = Math.abs(r.nextInt()%500);y = Math.abs(r.nextInt()%500);g.drawLine(x1, y1, x1, y1);g.drawLine(x2, y2, x2, y2);g.drawLine(x3, y3, x3, y3);g.drawLine(x, y, x, y);for(int i =1;i<1000000;i++){int P = getP();//若随机数为1，则if(P==1){x = (x1+x)/2;y = (y1+y)/2;g.drawLine(x, y, x, y);}//若随机数为2，则else if(P==2){x = (x2+x)/2;y = (y2+y)/2;g.drawLine(x, y, x, y);}//若随机数为3，则else if(P==3){x = (x3+x)/2;y = (y3+y)/2;g.drawLine(x, y, x, y);}}}//随机取1,2,3中的一个数public int getP(){Random r = new Random();int P = Math.abs((int)r.nextGaussian()%3);return P+1;}}
package 小游戏;import java.awt.Color;public class config {static Color c1 = Color.black;static Color c2 = Color.blue;static Color c3 = Color.cyan;static Color c4 = Color.gray;static Color c5 = Color.green;static Color c6 = Color.magenta;static Color c7 = Color.orange;static Color c8 = Color.pink;static Color c9 = Color.red;static Color c10 = Color.white;static Color c11 = Color.yellow;
}
结果发现，生成的图像不是原来以为的不规则排列，而是一个在“数学上非常美丽的图形”。原来所谓的“随机”并不是完全的随机，在大尺度之下，也就是在统计学下，是有规律可找的
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