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:

  
  

  
  
  

  // 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: To demonstrate java.lang.NullPointerException

  
  

  
  
  

  // 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: To demonstrate java.lang.ArrayIndexOutOfBoundsException

  
  

  
  
  

  // 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: To demonstrate java.lang.IllegalArgumentException

  
  

  
  
  

  // 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
  

  
  
  
  
  
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