Array setChar() method in Java
Last Updated :
30 Nov, 2018
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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.
- 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:
Program 2: To demonstrate java.lang.NullPointerException
Before Set : a b c d e After Set : a g c d e
// 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:
Program 3: To demonstrate java.lang.ArrayIndexOutOfBoundsException
Exception : 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
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:
Program 4: To demonstrate java.lang.IllegalArgumentException
Exception : 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 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
