Java编程一个随机数产生模块代码分享

import java.awt.Color;
import java.util.Collection;
import java.util.Iterator;
import java.util.Random;
public class RandomSet  
{
	static Random random = new Random();
	//获得一个给定范围的随机整数 
	public static int getRandomNum(int smallistNum,int BiggestNum) 
	  {
		return (Math.abs(random.nextint())%(BiggestNum-smallistNum+1))+smallistNum;
	}
	//获得一个随机的布尔值 
	public static Boolean getRandomBoolean() 
	  {
		return (getRandomNum(0,1) == 1);
	}
	//获得一个随机在0~1的浮点数 
	public static float getRandomFloatIn_1() 
	  {
		return (float)getRandomNum(0,1000)/1000;
	}
	//获得一个随机的颜色 
	public static Color getRandomColor() 
	  {
		float R = (float)getRandomNum(0,255)/255;
		float G = (float)getRandomNum(0,255)/255;
		float B = (float)getRandomNum(0,255)/255;
		return new Color(R,G,B);
	}
	//以一定概率返回一个布尔值 
	public static Boolean getRate(int rate) 
	  {
		if(rate<0 || rate > 100) 
		    {
			return false;
		} else 
		    {
			if(getRandomNum(0,100)<rate) 
			      {
				return true;
			} else 
			      {
				return false;
			}
		}
	}
	//返回给定数组中的一个随机元素 
	public static <T> T getElement(T[] t) 
	  {
		int index = getRandomNum(0,t.length - 1);
		return t[index];
	}
	//返回给定Collection中的一个随机元素 
	public static <T> T getElement(Collection<? extends T> c) 
	  {
		int atmp = getRandomNum(0,c.size() - 1);
		Iterator<? extends T> iter = c.iterator();
		while(atmp > 0) 
		    {
			atmp--;
			iter.next();
		}
		return iter.next();
	}
}