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Array getBoolean() Method in Java
  • Last Updated : 30 Nov, 2018

The java.lang.reflect.Array.getBoolean() returns the given index from the specified Array as a short.

Syntax:

Array.getBoolean(Object []array,int index)

Parameters:

  • array: The object array whose index is to be returned.
  • index: The particular index of the given array. The element at ‘index’ in the given array is returned.

Return Type: This method returns the element of the array as boolean.

Note: Typecast isn’t necessary as the return type is boolean.



Exception: 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 programs illustrate the getBoolean() method of Array class:

Program 1:




// Java code to demonstrate getBoolean() method of Array class
import java.lang.reflect.Array;
public class GfG  {
    // main method
    public static void main(String[] args) {
           
       // Declaring and defining a boolean array
       boolean a[] = {true,true,false};
          
       // Traversing the array
       for(int i = 0;i<3;i++){
              
           // Array.getBoolean() method
              
           boolean x = Array.getBoolean(a, i);
           // Printing the values
           System.out.print(x + " ");
       }
           
    }
}
Output:
true true false

Program 2:




// Java code to demonstrate getBoolean() method in Array
import java.lang.reflect.Array;
    
public class GfG {
    
    // main method
    public static void main(String[] args) {
        // Declaring and defining a boolean array
        boolean a[] = {true,true,false};
    
        try {
            // invalid index
            boolean x =  Array.getBoolean(a, 6);
            System.out.println(x);
        } catch (Exception e) {
            // throws Exception
            System.out.println("Exception : " + e);
        }
    }
}
Output:
Exception : java.lang.ArrayIndexOutOfBoundsException

Program 3:




// Java code to demonstrate getBoolean() method in Array
import java.lang.reflect.Array;
    
public class GfG {
    
    // main method
    public static void main(String[] args) {
        // Declaring and defining a boolean array to null
        boolean a[] = null;
    
        try {
            // null Object array
            boolean x =  Array.getBoolean(a, 6);
            System.out.println(x);
        } catch (Exception e) {
            // throws Exception
            System.out.println("Exception : " + e);
        }
    }
}
Output:
Exception : java.lang.NullPointerException

Program 4:




// Java code to demonstrate getBoolean() method in Array
import java.lang.reflect.Array;
    
public class GfG {
    
    // main method
    public static void main(String[] args) {
        // Declaring and defining a boolean variable
        boolean a = true;
    
        try {
            // illegalArgument
            boolean x =  Array.getBoolean(a, 6);
            System.out.println(x);
        } catch (Exception e) {
            // throws Exception
            System.out.println("Exception : " + e);
        }
    }
}
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array

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