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Array setInt() method in Java

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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.
    // 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 : To demonstrate java.lang.ArrayIndexOutOfBoundsException.
    // 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 : To demonstrate java.lang.IllegalArgumentException.
    // 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
    


    Last Updated : 10 Nov, 2022
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