Java Random randomPermutations(int[] tab, Random r)

Description

random Permutations

License

Open Source License

Declaration

public static int[] randomPermutations(int[] tab, Random r) 

Method Source Code

//package com.java2s;
import java.util.*;

public class Main {
    public static int[] randomPermutations(int[] tab, Random r) {
        int l = tab.length;
        for (int i = 0; i < l; i++) {
            int j = r.nextInt(l);
            int tmp = tab[i];
            tab[i] = tab[j];//  ww  w .  ja  v  a  2  s.  c  o m
            tab[j] = tmp;
        }
        return tab;
    }

    public static int[] randomPermutations(int[] tab, long seed) {
        return randomPermutations(tab, new Random(seed));
    }

    public static <E> E[] randomPermutations(E[] tab, Random r) {
        int l = tab.length;
        for (int i = 0; i < l; i++) {
            int j = r.nextInt(l);
            E tmp = tab[i];
            tab[i] = tab[j];
            tab[j] = tmp;
        }
        return tab;
    }

    public static <E> E[] randomPermutations(E[] tab, long seed) {
        return randomPermutations(tab, new Random(seed));
    }
}

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