invert list - Android java.util

Android examples for java.util:List Element

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Description

invert list

Demo Code


//package com.java2s;

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

public class Main {
    /**/*from  w w  w .  ja va2 s.  co  m*/
     * invert list
     * 
     * @param <V>
     * @param sourceList
     * @return
     */
    public static <V> List<V> invertList(List<V> sourceList) {
        if (isEmpty(sourceList)) {
            return sourceList;
        }

        List<V> invertList = new ArrayList<V>(sourceList.size());
        for (int i = sourceList.size() - 1; i >= 0; i--) {
            invertList.add(sourceList.get(i));
        }
        return invertList;
    }

    /**
     * is null or its size is 0
     * 
     * <pre>
     * isEmpty(null)   =   true;
     * isEmpty({})     =   true;
     * isEmpty({1})    =   false;
     * </pre>
     * 
     * @param <V>
     * @param sourceList
     * @return if list is null or its size is 0, return true, else return false.
     */
    public static <V> boolean isEmpty(List<V> sourceList) {
        return (sourceList == null || sourceList.size() == 0);
    }
}

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