Multiple Choice Question

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Submitted by c-admin on Wed, 06/05/2019 - 03:26

QID:

516

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

arrays

Question:

What will the following program print?

public class TestClass{
static boolean b;
static int[] ia = new int[1];
static char ch;
static boolean[] ba = new boolean[1];
public static void main(String args[]) throws Exception{
boolean x = false;
if( b ){
x = ( ch == ia[ch]);
}
else x = ( ba[ch] = b );
System.out.println(x+" "+ba[ch]);
}
}

Select 1 option

A. true true
B. true false
C. false true
D. false false
E. It will not compile.

Answer and Explanation (Click to expand)

Answer:

Explanation:

This question tests your knowledge on the default values of uninitialized primitives and object references. booleans are initialized to false, numeric types to 0 and object references to null. Elements of arrays are initialized to the default values of their types. So, elements of a boolean array are initialized to false. int, char, float to 0 and Objects to null.

In this case, b is false. So the else part of if(b) is executed. ch is a numeric type to its value is 0. ba[0] = false assigns false to ba[0] and returns false which is assigned to x.

Finally, x and ba[0] are printed as false false.

Q&A Set:

Set 30

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