randomarray.java

来自「手机拼图游戏：J2ME游戏」· Java 代码 · 共 62 行

package util;

import java.util.Random;
import java.util.Hashtable;

/**
 * Created by IntelliJ IDEA.
 * User: robai
 * Date: 2007-2-26
 * Time: 13:23:52
 * To change this template use File | Settings | File Templates.
 */
public class RandomArray
{
    Random random = new Random();
    int[] ic = null;
    int icLength = 0;

    public int[] createRandomIntArray(int[] a)
    {

        int[] b = new int[a.length];
        ic = new int[a.length];
        icLength = a.length;

        for(int i=0;i<ic.length;i++)
        {
            ic[i] = a[i];

        }
        for(int i=0; i< b.length; i++)
            b[i] = getRandomIndex();

        return b;
    }

    private int getRandomIndex()
    {
        int m= random.nextInt()%icLength;
        int rIndex = m<0?-m:m;
        int r = ic[rIndex];
        for(int i=rIndex;i<icLength-1;i++)
            ic[i]=ic[i+1];
        ic[icLength-1] = 0;
        icLength--;
        return r;
    }

    private void printArray(int[] a)
    {
        for(int i=0;i<a.length;i++)
        {
            if(i==0)
                System.out.print(a[i]);
            else
                System.out.print(","+a[i]);
        }
        System.out.println();
    }

}