BigInteger equals() Method in Java - GeeksforGeeks

04 Dec, 2018
The java.math.BigInteger.equals(Object x) method compares this BigInteger with the object passed as the parameter and returns true in both are equal in value else it returns false.
Syntax:
public boolean equals(Object x)
Parameter: This method accepts a single mandatory parameter x which is the Object to which BigInteger Object is to be compared.
Returns: This method returns boolean true if and only if the Object passed as parameter is a BigInteger whose value is equal to the BigInteger Object on which the method is applied. Otherwise it will return false.
Examples:
Input: BigInteger1=2345, BigInteger2=7456
Output: false
Explanation: BigInteger1.equals(BigInteger2)=false.

Input: BigInteger1=7356, BigInteger2=7456
Output: true
Explanation: BigInteger1.equals(BigInteger2)=true.

Below programs illustrate equals() method of BigInteger class:
Example 1: When both are equal in value.
// Java program to demonstrate equals() method of BigInteger  import java.math.BigInteger;  public class GFG {      public static void main(String[] args)    {          // Creating 2 BigInteger objects        BigInteger b1, b2;          b1 = new BigInteger("321456");        b2 = new BigInteger("321456");          // apply equals() method        boolean response = b1.equals(b2);          // print result        if (response) {              System.out.println("BigInteger1 " + b1                               + " and BigInteger2 "                               + b2 + " are equal");        }        else {              System.out.println("BigInteger1 " + b1                               + " and BigInteger2 "                               + b2 + " are not equal");        }    }}
BigInteger1 321456 and BigInteger2 321456 are equal

Example 2: When both are not equal in value.
// Java program to demonstrate equals() method of BigInteger  import java.math.BigInteger;  public class GFG {      public static void main(String[] args)    {          // Creating 2 BigInteger objects        BigInteger b1, b2;          b1 = new BigInteger("321456");        b2 = new BigInteger("456782");          // apply equals() method        boolean response = b1.equals(b2);          // print result        if (response) {              System.out.println("BigInteger1 " + b1                               + " and BigInteger2 "                               + b2 + " are equal");        }        else {              System.out.println("BigInteger1 " + b1                               + " and BigInteger2 " + b2 + " are not equal");        }    }}
BigInteger1 321456 and BigInteger2 456782 are not equal

Example 3: When object passed as parameter is other than BigInteger.
// Java program to demonstrate equals() method of BigInteger  import java.math.BigInteger;  public class Main6 {      public static void main(String[] args)    {          // Creating  BigInteger object        BigInteger b1;          b1 = new BigInteger("321456");        String object = "321456";          // apply equals() method        boolean response = b1.equals(object);          // print result        if (response) {              System.out.println("BigInteger1 " + b1                               + " and String Object "                               + object + " are equal");        }        else {              System.out.println("BigInteger1 " + b1                               + " and String Object "                               + object + " are not equal");        }    }}
BigInteger1 321456 and String Object 321456 are not equal

Reference: https://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html#equals(java.lang.Object)
java-basics
Java-BigInteger
Java-Functions
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