Array getBoolean() Method in Java

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:

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// 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 + " ");
       }
           
    }
}

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Output:


true true false





Program 2:











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// 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); 


        } 


    } 


} 



















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Output:


Exception : java.lang.ArrayIndexOutOfBoundsException





Program 3:











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// 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); 


        } 


    } 


} 



















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Output:


Exception : java.lang.NullPointerException





Program 4:











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// 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); 


        } 


    } 


} 



















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Output:


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






          
          
          
          

            

    

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