Array setLong() method in Java

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

Syntax:

Array.setLong(Object []array, int index, long 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 long value that is to be set at the given index of the given array.

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

Exception: This method throws following exceptions.



  • 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.setLong() method:

    Program 1 :

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

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    Output

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

    Program 2 : To demonstrate java.lang.NullPointerException

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    // Java code to demonstrate setLong() method of Array class
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
      
            // Declaring and defining long array to null
            long b[] = null;
            try {
                Array.setLong(b, 5, 10);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output

    Exception : java.lang.NullPointerException
    

    Program 3 : To demonstrate java.lang.ArrayIndexOutOfBoundsException

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    // Java code to demonstrate setLong() method of Array class
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
      
            // Declaring and defining long array
            long b[] = { 1, 2, 3, 4 };
            try {
                Array.setLong(b, 5, 10);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output

    Exception : java.lang.ArrayIndexOutOfBoundsException
    

    Program 4 : To demonstrate java.lang.IllegalArgumentException.

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    // Java code to demonstrate setLong() method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
        // main method
        public static void main(String[] args)
        {
      
            // Declaring and defining long variable
            long b = 1;
            try {
                Array.setLong(b, 5, 10);
            }
            catch (Exception e) {
                System.out.println("Exception : " + e);
            }
        }
    }

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    Output

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

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