Java Permute permute(Iterable files, Random rand)

Description

permute

License

Apache License

Declaration

public static List<File> permute(Iterable<File> files, Random rand) 

Method Source Code

//package com.java2s;
/**//w  w w  . ja  va 2s  .  c  o 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.
 */

import java.io.File;

import java.util.ArrayList;
import java.util.List;

import java.util.Random;

public class Main {
    public static List<File> permute(Iterable<File> files, Random rand) {
        List<File> r = new ArrayList<>();
        for (File file : files) {
            int i = rand.nextInt(r.size() + 1);
            if (i == r.size()) {
                r.add(file);
            } else {
                r.add(r.get(i));
                r.set(i, file);
            }
        }
        return r;
    }
}

Related

1. permutationBuilder(ArrayList curList, int next)
2. permutationBuilder2(ArrayList> inputArray, int k)