Java Fundamentals Practice

Identify the output of the following program. String str = "Hellow"; System.out.println(str.indexOf('t));

-1

class comma_operator { public static void main(String args[]) { int sum = 0; for (int i = 0, j = 0; i < 5 & j < 5; ++i, j = i + 1) sum += i; System.out.println(sum); } }

10

How many objects will be created in the following? String a = new String("Interviewbit"); String b = new String("Interviewbit"); Strinc c = "Interviewbit"; String d = "Interviewbit";

2

What will be the output of the following Java program? class selection_statements { public static void main(String args[]) { int var1 = 5; int var2 = 6; if ((var2 = 1) == var1) System.out.print(var2); else System.out.print(++var2); } }

2

What is the output of the following code? public class Solution{ public static void main(String args[]){ int i; for(i = 1; i < 6; i++){ if(i > 3) continue; } System.out.println(i); }} Question 15Answer

4

Find the output of the following code. int ++a = 100; System.out.println(++a);

Compile error

What is Truncation in Java?

Floating-point value assigned to an integer type

What will be the output of the following Java program?class output { public static void main(String args[]) { double a, b,c; a = 3.0/0; b = 0/4.0; c = 0/0.0; System.out.println(a); System.out.println(b); System.out.println(c); } }

NaN, infinity, 0.0

When an array is passed to a method, what does the method receive?

The reference of the array

What will be the output of the following Java program? class Abc { public static void main(String[]args) { String[] elements = { "for", "tea", "too" }; String first = (elements.length > 0) ? elements[0]: null; } }

The variable first is set to null

What will be the output of the following Java code? class String_demo { public static void main(String args[]) { char chars[] = {'a', 'b', 'c'}; String s = new String(chars); System.out.println(s); }}

abc

When is the object created with new keyword?

depends on the code

Which of these selection statements test only for equality?

if

Arrays in Java are

objects

What is the header (prototype) of the default constructor for the following class? public class Question{}

public Question()

Which of the following modifiers cannot be used for constructor?

static