Array setInt() method in Java

The java.lang.reflect.Array.setInt() is an inbuilt method in Java and is used to set a specified int value to a specified index of a given object array.

Syntax:

Array.setInt(Object []array, int index, int value)

Parameter:

• array: This is an array of type Object which is to be updated.
• index: This is the index of the array which is to be updated.
• value: This is the int value that is to be set at the given index of the given array.

Return Value: This is a void type method this doesn’t returns any value. The update reflects upon the Object array passed as the argument.

Exception : This method throws following exception.

• NullPointerException – when the array is null.
• IllegalArgumentException – when the given object array is not an Array.
• ArrayIndexOutOfBoundsException – if the given index is not in the range of the size of the array.

Below programs illustrate the Array.setInt() method:

Program 1 :








// Java code to demonstrate setInt() method of Array class import java.lang.reflect.Array; public class GfG {     // main method     public static void main(String[] args)     {            // Declaring and defining Integer array         int b[] = { 1, 2, 3, 4 };         System.out.print("Before Set : ");         // printing the array         for (Integer x : b) {             System.out.print(x + " ");         }         int value = 10;         // set method of class Array         Array.setInt(b, 1, value);            System.out.print("\nAfter Set : ");         // printing array         for (Integer x : b) {             System.out.print(x + " ");         }     } }

Output

Before Set : 1 2 3 4 
After Set : 1 10 3 4 

Program 2 : To demonstrate java.lang.NullPointerException.

Output

Exception : java.lang.NullPointerException

Program 3 : To demonstrate java.lang.ArrayIndexOutOfBoundsException.

Output

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4 : To demonstrate java.lang.IllegalArgumentException.

Output

Exception : java.lang.IllegalArgumentException: Argument is not an array