BinarySearch in java What is the result Yasser Ibrahim @Jobilize

Author: Yasser Ibrahim

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Question 198 / 297: What is the result of compiling and running the following code?
Choose 2

import java.util.Arrays;

public class Tester {
public static void main(String[] args) {
		Integer[] arr = { 1, 2, 3 }; 
		System.out.print(Arrays.binarySearch(arr, 1)); // line 1
		System.out.print(Arrays.binarySearch(arr, "javachamp")); // line 2
	}
}

line 1 will print 0

line 1 will print 1

line 1 causes compilation error

line 2 will print 0

line 2 will causes compilation error

line 2 will causes RunTimeException

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Explanation:

Method binarySearch has different signatures, the one used in this program is

binarySearch(Object[] a, Object key)

which means it accepts any object type for the second parameter no matter what the type of the array being passed. Therefore line 2; searching for a String in an Integer array; causes no compilation error, but causes ClassCastException at run time when trying to cast the String to an Integer.

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