Return true if same objects exist in listA and listB - Java java.util

Java examples for java.util:List Compare

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Description

Return true if same objects exist in listA and listB

Demo Code


//package com.java2s;
import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

public class Main {
    public static void main(String[] argv) {
        Collection listA = java.util.Arrays.asList("asdf", "java2s.com");
        Collection listB = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(isEqual(listA, listB));
    }// w  w  w. j  a v a  2 s . c om

    /**
     * Return true if same objects exist in listA and listB
     */
    public static <T> boolean isEqual(Collection<T> listA,
            Collection<T> listB) {
        if (listA.size() != listB.size()) {
            return false;
        }
        if (listA.size() != setIntersection(listA, listB).size()) {
            return false;
        }
        return true;
    }

    /**
     * @return The intersection of two sets A and B is the set of elements common to A and B
     */
    public static <T> List<T> setIntersection(Collection<T> listA,
            Collection<T> listB) {
        ArrayList<T> intersection = new ArrayList<T>(listA.size());

        for (T obj : listA) {
            if (listB.contains(obj)) {
                intersection.add(obj);
            }
        }
        return intersection;
    }
}

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