Method will determine if all elements in the input ArrayList are all unique - Java Collection Framework

Java examples for Collection Framework:List

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Description

Method will determine if all elements in the input ArrayList are all unique

Demo Code


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

public class Main {
    /**/*from w  ww. j  av a 2s.c o m*/
     * Method will determine if all elements in the input set are all unique 
     * 
     * @param arraySet - the input array to check 
     * @return true if there are no duplicates, false if duplicates exists
     */
    public static boolean isUnique(ArrayList<Integer> arraySet) {
        boolean isUnique = true;
        if (arraySet == null) {
            isUnique = false;
        } else {
            for (int i = 0; i < arraySet.size() && isUnique; i++) {
                for (int j = i + 1; j < arraySet.size() && isUnique; j++) {
                    isUnique = arraySet.get(i) != arraySet.get(j);
                }
            }
        }
        return isUnique;
    }
}

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