Array setInt() method in Java

Last Updated : 10 Nov, 2022

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.

Program 1 :

Java

// 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 :

Java

// 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 to null
        Integer b[] = null;
        try {
            Array.setInt(b, 5, 10);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output

Exception : java.lang.NullPointerException

Program 3 :

Java

// 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
        Integer b[] = { 1, 2, 3, 4 };
        try {
            Array.setInt(b, 5, 10);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4 :

Java

// 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 variable
        Integer b = 1;
        try {
            Array.setInt(b, 5, 10);
        }
        catch (Exception e) {
            System.out.println("Exception : " + e);
        }
    }
}

Output

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

Array set() method in Java

ShivamKD

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