The **toUnsignedLong()** method is a static method of the **Integer wrapper class** which is used to convert an int primitive to long by using the unsigned conversion. In this post, we are going to look at the **toUnsignedLong()** method in detail.

**Method declaration –**public static long toUnsignedLong(int x)**What does it do?**It will convert the integer passed in the argument to a long value by using the unsigned conversion. We will look at how both positive and negative integers will be converted to their corresponding unsigned long value**What does it return?**It will return a long value after the conversion

**Now, what is signed and unsigned long values? **Signed long contain both positive and negative numbers and their range is from [-2^{63} to 2^{63}-1] whereas unsigned long contains only non-negative numbers ranging from [0 to 2^{64}-1].

**Converting the positive integers using the toUnsignedLong() method**

Zero or positive int values are mapped to a numerically equal long value.

```
public class Codekru {
public static void main(String[] args) {
int i = 12;
System.out.println("Unsigned long value: " + Integer.toUnsignedLong(i));
}
}
```

**Output –**

```
Unsigned long value: 12
```

**Converting the negative integers using the toUnsignedLong() method**

Negative int values will be converted to unsigned long by adding 2^{32} to the input value. So, if the int value is -12, then the unsigned long value would be -12+2^{32}.

```
public class Codekru {
public static void main(String[] args) {
int i = -12;
System.out.println("2^32 = " + (long) Math.pow(2, 32));
// -12+2^32 = -12 + 4294967296 = 4294967284s
System.out.println("Unsigned long value: " + Integer.toUnsignedLong(i));
}
}
```

**Output –**

```
2^32 = 4294967296
Unsigned long value: 4294967284
```

**Q- What if we passed an Integer instance instead of the int primitive into the function’s argument?**

Here, the integer instance will be unboxed to its primitive value, and then it would be converted to an unsigned long.

```
public class Codekru {
public static void main(String[] args) {
// using valueOf method to create integer instance
Integer i = Integer.valueOf(12);
System.out.println("Unsigned long value: " + Integer.toUnsignedLong(i));
}
}
```

**Output –**

`Unsigned long value: 12`

Please visit **this link** if you want to know more about the **Integer wrapper** class of java and its other functions or methods.

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