exchange element in a List by index - Java java.util

Java examples for java.util:List Element

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Description

exchange element in a List by index

Demo Code


//package com.java2s;

import java.util.List;

public class Main {
    public static void main(String[] argv) {
        List list = java.util.Arrays.asList("asdf", "java2s.com");
        int indexA = 2;
        int indexB = 4;
        exchange(list, indexA, indexB);// ww  w  .  j a v  a 2  s .co m
    }

    public static <T> void exchange(List<T> list, int indexA, int indexB) {
        indexA -= 1;
        indexB -= 1;

        if (indexA >= list.size() || indexB >= list.size() || indexA < 0
                || indexB < 0 || indexA == indexB) {
            return;
        } else {
            T _a = list.get(indexA);
            T _b = list.get(indexB);
            list.remove(indexA);
            list.add(indexA, _b);
            list.remove(indexB);
            list.add(indexB, _a);
            return;
        }
    }
}

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