shuffle an int array - Java java.lang

Java examples for java.lang:int Array

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Description

shuffle an int array

Demo Code

/**/*from   w w  w.java  2  s  .  co  m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//package com.java2s;

import java.util.Random;

public class Main {
    public static void shuffle(int[] list, Random rnd) {
        shuffle(list, list.length, rnd);
    }

    public static void shuffle(int[] list, int len, Random rnd) {
        for (int i = len; i > 1; i--) {
            swap(list, i - 1, rnd.nextInt(i));
        }
    }

    public static void swap(int[] arr, int a, int b) {
        int t = arr[a];
        arr[a] = arr[b];
        arr[b] = t;
    }

    public static void swap(double[] arr, int a, int b) {
        double t = arr[a];
        arr[a] = arr[b];
        arr[b] = t;
    }
}

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