LinkedHashSet equals() method in Java with Example

The equals() method of java.util.LinkedHashSet class is used to compare the specified object with this set for equality. Returns true if and only if the specified object is also a set, both sets have the same size, and all corresponding pairs of elements in the two sets are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two sets are defined to be equal if they contain the same elements in any order. 

Syntax:

public boolean equals(Object o)

Parameters: This method takes the object o as a parameter to be compared for equality with this set. 

Returns Value: This method returns true if the specified object is equal to this set. Below are examples to illustrate the equals() method.

Example 1:

Java

// Java program to demonstrate equals()
// method of LinkedHashSet

import java.util.*;

public class GFG {
    public static void main(String[] argv)
    {

        // Creating object of LinkedHashSet<String>
        LinkedHashSet<String> set1
            = new LinkedHashSet<String>();

        // Populating set1
        set1.add("A");
        set1.add("B");
        set1.add("C");
        set1.add("D");
        set1.add("E");

        // print set1
        System.out.println("First LinkedHashSet: " + set1);

        // Creating another object of LinkedHashSet<String>
        LinkedHashSet<String> set2
            = new LinkedHashSet<String>();

        // Populating set2
        set2.add("A");
        set2.add("B");
        set2.add("C");
        set2.add("D");
        set2.add("E");

        // print set2
        System.out.println("Second LinkedHashSet: " + set2);

        // comparing first LinkedHashSet to another
        // using equals() method
        boolean value = set1.equals(set2);

        // print the value
        System.out.println("Are both set equal: " + value);
    }
}

Output:

First LinkedHashSet: [A, B, C, D, E]
Second LinkedHashSet: [A, B, C, D, E]
Are both set equal: true

Example 2:

Java

// Java program to demonstrate equals()
// method of LinkedHashSet

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {

        // Creating object of LinkedHashSet
        LinkedHashSet<Integer>
            set1 = new LinkedHashSet<Integer>();

        // Populating set1
        set1.add(10);
        set1.add(20);
        set1.add(30);
        set1.add(40);
        set1.add(50);

        // print set1
        System.out.println("First LinkedHashSet: "
                           + set1);

        // Creating another object of LinkedHashSet
        LinkedHashSet<Integer>
            set2 = new LinkedHashSet<Integer>();

        // Populating set2
        set2.add(10);
        set2.add(20);
        set2.add(30);

        // print set2
        System.out.println("Second LinkedHashSet: "
                           + set2);

        // comparing first LinkedHashSet to another
        // using equals() method
        boolean value = set1.equals(set2);

        // print the value
        System.out.println("Are both set equal: "
                           + value);
    }
}

Output:

First LinkedHashSet: [10, 20, 30, 40, 50]
Second LinkedHashSet: [10, 20, 30]
Are both set equal: false