Array setChar() method in Java

Last Updated : 30 Nov, 2018

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.

Program 1:

Java

// 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 + " ");
        }
    }
}

Output:

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

Program 2:

Java

// 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);
        }
    }
}

Output:

Exception : java.lang.NullPointerException

Program 3:

Java

// 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);
        }
    }
}

Output:

Exception : java.lang.ArrayIndexOutOfBoundsException

Program 4:

Java

// 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);
        }
    }
}

Output:

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

Array setShort() method in Java

ShivamKD

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