Mega Code Archive
Randomizer
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//package com.qlogic.commons.utils;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Random;
import java.util.Set;
public class Randomizer extends Random {
/**
*
*/
private static final long serialVersionUID = -4644693860576394313L;
public static Randomizer getInstance() {
return _instance;
}
public Randomizer() {
super();
}
public Randomizer(long seed) {
super(seed);
}
public int[] nextInt(int n, int size) {
if (size > n) {
size = n;
}
Set set = new LinkedHashSet();
for (int i = 0; i < size; i++) {
while (true) {
Integer value = new Integer(nextInt(n));
if (!set.contains(value)) {
set.add(value);
break;
}
}
}
int[] array = new int[set.size()];
Iterator itr = set.iterator();
for (int i = 0; i < array.length; i++) {
array[i] = ((Integer) itr.next()).intValue();
}
return array;
}
public void randomize(char array[]) {
int length = array.length;
for (int i = 0; i < length - 1; i++) {
int x = nextInt(length);
char y = array[i];
array[i] = array[i + x];
array[i + x] = y;
length--;
}
}
public void randomize(int array[]) {
int length = array.length;
for (int i = 0; i < length - 1; i++) {
int x = nextInt(length);
int y = array[i];
array[i] = array[i + x];
array[i + x] = y;
length--;
}
}
public void randomize(List list) {
int size = list.size();
for (int i = 0; i <= size; i++) {
int j = nextInt(size);
Object obj = list.get(i);
list.set(i, list.get(i + j));
list.set(i + j, obj);
size--;
}
}
public void randomize(Object array[]) {
int length = array.length;
for (int i = 0; i < length - 1; i++) {
int x = nextInt(length);
Object y = array[i];
array[i] = array[i + x];
array[i + x] = y;
length--;
}
}
public String randomize(String s) {
if (s == null) {
return null;
}
char[] array = s.toCharArray();
randomize(array);
return new String(array);
}
private static Randomizer _instance = new Randomizer();
}
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