The java.lang.reflect.Array.setBoolean() method is an inbuilt method used to set a specified Boolean value to a specified index of a given object array.
Syntax:
Array.setBoolean(Object []array, int index, boolean value)
Parameter: This method takes three parameters:
- array: array of type Object which is to be updated.
- index: index of the array which is to be updated.
- value: boolean value that is to be set at the given index of the given array.
Return type: This is a void type method and 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 is the implementation of Array.setBoolean() method:
Program 1:
// Java code to demonstrate setBoolean()// method of Array class  import java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining boolean array        boolean b[] = { true, false, true };          // array before using setBoolean()        System.out.print("Before Set : ");          // printing the array        for (boolean x : b) {            System.out.print(x + " ");        }          // boolean value to be set        boolean value = true;          // setBoolean method of class Array        Array.setBoolean(b, 1, value);          // array after using setBoolean()        System.out.print("\nAfter Set : ");          // printing array        for (boolean x : b) {            System.out.print(x + " ");        }    }} |
Output:
Before Set : true false true After Set : true true true
Program 2: To demonstrate java.lang.NullPointerException
// Java code to demonstrate setBoolean()// method of Array class  import java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining boolean array to null        boolean b[] = null;          try {            // boolean value to be set            boolean c = false;              // passing a null array as parameter            Array.setBoolean(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 setBoolean()// method of Array class  import java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining boolean array        boolean b[] = { true, false, true };          try {            // value to be set            boolean c = false;              // passing index as 5 when size is 3            Array.setBoolean(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 setBoolean()// method of Array class  import java.lang.reflect.Array;public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining boolean variable        boolean b = true;          try {            // value to be set            boolean c = false;              // passing variable in the place of an array            Array.setBoolean(b, 5, c);        }        catch (Exception e) {            System.out.println("Exception : " + e);        }    }} |
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
