The **`add` method** of the `BigInteger` class can add the passed `BigInteger` object value with the called `BigInteger` object value.

#      
#  Syntax

---
```java
public BigInteger add(BigInteger val)
```
---

# 
## Argument

This method takes a `BitInteger` object as an argument. 

##
## Return value 

This method returns a `BitInteger` object. The value of the returned `BigInteger` object is the sum of the argument and the current `BigInteger` object value.

# 
## Code

The example below demonstrates how to use the `add` method.

import java.math.BigInteger;

class BigIntegerAddExample {
    public static void main( String args[] ) {
        BigInteger val1 = new BigInteger("1000");
        BigInteger val2 = new BigInteger("100");
        BigInteger result = val1.add(val2);
        System.out.println(result);
    }
}

# 
## Explanation 

In the code above, we do the following:

* Line 1, we import the `BigInteger` class.

---
```
import java.math.BigInteger;
```
---

* Lines 5 and 6, we create two `BigInteger` 
 objects: `val1` with value `1000` and `val2` with value `100`. 

---
```
BigInteger val1 = new BigInteger("1000");
BigInteger val2 = new BigInteger("100");
```
---

* Line 7, we call the `add` method on the `val1` object with `val2` as an argument. 
* This returns a `BigInteger` which has a value equal to the sum of `val1` and `val2`.

---
```
BigInteger result = val1.add(val2); //1100
```

What is the BigInteger.add method in Java?

The add method in BigInteger class adds two BigInteger values and returns their sum as a new BigInteger object.