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