Array setChar() method in Java

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

Syntax:

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

Parameter: This method takes three parameters:



  • 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 char value that is to be set at the given index of the given array.

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

Exceptions: 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 is the implementation of Array.setChar() method:

    Program 1:

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    // Java code to demonstrate setChar()
    // method of Array class
      
    import java.lang.reflect.Array;
      
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining char array
            char ch[] = { 'a', 'b', 'c', 'd', 'e' };
      
            System.out.print("Before Set : ");
      
            // printing the array
            for (char x : ch) {
                System.out.print(x + " ");
            }
      
            char value = 'g';
      
            // setChar method of class Array
            Array.setChar(ch, 1, value);
      
            System.out.print("\nAfter Set : ");
      
            // printing array
            for (char x : ch) {
                System.out.print(x + " ");
            }
        }
    }

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    Output:

    Before Set : a b c d e 
    After Set : a g c d e
    

    Program 2: To demonstrate java.lang.NullPointerException

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    // Java code to demonstrate setChar()
    // method of Array class
      
    import java.lang.reflect.Array;
      
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining char array to null
            char b[] = null;
      
            try {
                char c = 'a';
      
                // Passing null array in parameter
                Array.setChar(b, 5, c);
            }
            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
    // setChar() method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining char array
            char b[] = { 'a', 'b', 'c', 'd' };
      
            try {
                char c = 'g';
                // Passing index 5 as parameter
                // when the size is 4 instead
                Array.setChar(b, 5, c);
            }
            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 setChar()
    // method of Array class
      
    import java.lang.reflect.Array;
    public class GfG {
      
        // main method
        public static void main(String[] args)
        {
            // Declaring and defining char variable
            char b = 'b';
      
            try {
                char c = 'g';
      
                // Passing a variable as parameter
                // when an array is expected instead
                Array.setChar(b, 5, c);
            }
            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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