# 
#  What is `checkIndex`?

The method **`checkIndex`** is a static method of the `Objects` class.

This method checks whether the input `index` is within bounds of the input `length`:

    0 <= index < length

The `index` and `length` are passed as arguments to the method.

##
## Exceptions in `checkIndex`

The method throws `IndexOutOfBoundsException` if any of the following conditions are true:

1. The `index` is less than zero.

2. The `length` is less than zero.

3. The `index` is greater than `length`.

---
> This method was introduced in Java 9. 
---

To use the `checkIndex` method, import the following module:

```
java.util.Objects
```

# 
#  Syntax
---
```
public static int checkIndex(int index, int length)
```
---

##
## Parameters

* `int index` - index value  

* `int length` - length value, i.e., the upper bound


# 
## Code
## 
### Example 1

In the code below, `-1` is passed as an `index` value. So, executing the code should throw `IndexOutOfBoundsException`.

import java.util.Objects;

public class Main {
    public static void main(String[] args) {
        int index = -1;
        int length = 10;
        System.out.println(Objects.checkIndex(index, length));
    }
}


## 
### Example 2

In the code below, `-1` is passed as the `length` value. So, executing the code should throw `IndexOutOfBoundsException`.

import java.util.Objects;

public class Main {
    public static void main(String[] args) {
        int index = 4;
        int length = -1;
        System.out.println(Objects.checkIndex(index, length));
    }
}


## 
### Example 3

In the code below, `4` is passed as `index` value and `10` as the `length` value. 

Executing the code should return the `index` value, as the index is within bounds of the length.

import java.util.Objects;

public class Main {
    public static void main(String[] args) {
        int index = 4;
        int length = 10;
        System.out.println(Objects.checkIndex(index, length));
    }
}


What is Objects.checkIndex in java?

Objects.checkIndex, a Java 9 Objects class method, checks index boundaries for a given length and throws IndexOutOfBoundsException if out of bounds.

What is Objects.checkIndex in java?

What is `checkIndex`?

Exceptions in `checkIndex`

Syntax

Parameters

Code

Example 1

Result 1

Example 2

Result 2

Example 3

Result 3

What is Objects.checkIndex in java?

What is checkIndex?

Exceptions in checkIndex

Syntax

Parameters

Code

Example 1

Result 1

Example 2

Result 2

Example 3

Result 3

What is `checkIndex`?

Exceptions in `checkIndex`