how to compare two arrays in java code example

Example 1: compare arrays java

import java.util.Arrays; 
class Test 
{ 
    public static void main (String[] args)  
    { 
        // inarr1 and inarr2 have same values 
        int inarr1[] = {1, 2, 3}; 
        int inarr2[] = {1, 2, 3};    
        Object[] arr1 = {inarr1};  // arr1 contains only one element 
        Object[] arr2 = {inarr2};  // arr2 also contains only one element 
        if (Arrays.equals(arr1, arr2)) 
            System.out.println("Same"); 
        else
            System.out.println("Not same"); 
    } 
}

Example 2: in java how to compare two strings

class scratch{
    public static void main(String[] args) {
        String str1 = "Nyello";
        String str2 = "Hello";
        String str3 = "Hello";

        System.out.println( str1.equals(str2) ); //prints false
        System.out.println( str2.equals(str3) ); //prints true
    }
}

Example 3: compare two lists and remove duplicates java

listA.removeAll(new HashSet(listB));