# BigInteger hashCode() Method in Java

The java.math.BigInteger.hashCode() method returns the hash code for this BigInteger. The hashcode is always the same if the object doesn’t change.
Hashcode is a unique code generated by the JVM at the time of object creation. We can use hashcode to perform some operation on hashing related algorithms like hashtable, hashmap etc. We can search an object with that unique code.

Syntax:

`public int hashCode()`

Returns: The method returns an integer value which represents hashCode value for this BigInteger.

Examples:

```Input: BigInteger1=32145
Output: 32145
Explanation: BigInteger1.hashCode()=32145.

Input: BigInteger1=7613721467324
Output: -1255493552
Explanation: BigInteger1.hashCode()=-1255493552.
```

Example 1: Below programs illustrate hashCode() method of BigInteger class

 `// Java program to demonstrate  ` `// hashCode() 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(``"32145"``); ` `        ``b2 = ``new` `BigInteger(``"7613721467324"``); ` ` `  `        ``// apply hashCode() method ` `        ``int` `hashCodeOfb1 = b1.hashCode(); ` `        ``int` `hashCodeOfb2 = b2.hashCode(); ` ` `  `        ``// print hashCode ` `        ``System.out.println(``"hashCode of "` `                           ``+ b1 + ``" : "` `+ hashCodeOfb1); ` `        ``System.out.println(``"hashCode of "` `                           ``+ b2 + ``" : "` `+ hashCodeOfb2); ` `    ``} ` `} `

Output:

```hashCode of 32145 : 32145
hashCode of 7613721467324 : -1255493552
```

Example 2: When both bigInteger has same value

 `// Java program to demonstrate  ` `// hashCode() 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(``"4326516236135"``); ` `        ``b2 = ``new` `BigInteger(``"4326516236135"``); ` ` `  `        ``// apply hashCode() method ` `        ``int` `hashCodeOfb1 = b1.hashCode(); ` `        ``int` `hashCodeOfb2 = b2.hashCode(); ` ` `  `        ``// print hashCode ` `        ``System.out.println(``"hashCode of "` `                           ``+ b1 + ``" : "` `+ hashCodeOfb1); ` `        ``System.out.println(``"hashCode of "` `                           ``+ b2 + ``" : "` `+ hashCodeOfb2); ` `    ``} ` `} `

Output:

```hashCode of 4326516236135 : 1484200280
hashCode of 4326516236135 : 1484200280
```

Reference:
BigInteger hashCode() Docs

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