AbstractList equals() method in Java with Examples
Last Updated :
11 Jul, 2025
The
equals() method of
java.util.AbstractList class is used to compare the specified object with this list for equality. Returns true if and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two lists are defined to be equal if they contain the same elements in the same order.
Syntax:
public boolean equals(Object o)
Parameters: This method takes the
object o as a parameter to be compared for equality with this list.
Returns Value: This method returns
true if the specified object is equal to this list.
Below are the examples to illustrate the
equals() method.
Example 1:
Java
// Java program to demonstrate
// equals() method
// for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of AbstractList<String>
AbstractList<String>
arrlist1 = new ArrayList<String>();
// Populating arrlist1
arrlist1.add("A");
arrlist1.add("B");
arrlist1.add("C");
arrlist1.add("D");
arrlist1.add("E");
// print arrlist1
System.out.println("First ArrayListlist : "
+ arrlist1);
// Creating another object of AbstractList<String>
AbstractList<String>
arrlist2 = new ArrayList<String>();
// Populating arrlist2
arrlist2.add("A");
arrlist2.add("B");
arrlist2.add("C");
arrlist2.add("D");
arrlist2.add("E");
// print arrlist2
System.out.println("Second ArrayList : "
+ arrlist2);
// comparing first ArrayList to another
// using equals() method
boolean value = arrlist1.equals(arrlist2);
// print the value
System.out.println("Are both list equal : "
+ value);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
First ArrayListlist : [A, B, C, D, E]
Second ArrayList : [A, B, C, D, E]
Are both list equal : true
Example 2:
Java
// Java program to demonstrate
// equals() method
// for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
// Creating object of AbstractList<Integer>
AbstractList<Integer>
arrlist1 = new ArrayList<Integer>();
// Populating arrlist1
arrlist1.add(10);
arrlist1.add(20);
arrlist1.add(30);
arrlist1.add(40);
arrlist1.add(50);
// print arrlist1
System.out.println("First ArrayListlist : "
+ arrlist1);
// Creating another object of AbstractList<Integer>
AbstractList<Integer>
arrlist2 = new ArrayList<Integer>();
// Populating arrlist2
arrlist2.add(10);
arrlist2.add(20);
arrlist2.add(30);
// print arrlist2
System.out.println("Second ArrayList : "
+ arrlist2);
// comparing first ArrayList to another
// using equals() method
boolean value = arrlist1.equals(arrlist2);
// print the value
System.out.println("Are both list equal : "
+ value);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
First ArrayListlist : [10, 20, 30, 40, 50]
Second ArrayList : [10, 20, 30]
Are both list equal : false
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