Java Basics

1.		Which of the following is a wrapper class in Java?

int

boolean

double

string

2.

What is the output of the following code?

public class Test {
public static void main(String args[]) {
int x = 10;
int y = 5;
if(x > y) {
System.out.println("x is greater than y");
} else {
System.out.println("x is less than or equal to y");
  }
 }
}

x is greater than y

x is less than or equal to y

Both statements are printed

No output

3.		What is Java?

A programming language

An operating system

A database management system

A web browser

4.		Which of the following is NOT a valid identifier in Java?

myVariable

$variable

2variable

_variable

5.		What is the output of the following code? public class Test { public static void main(String args[]) { System.out.println("Hello" + " World"); }

Hello

World

Hello World

HelloWorld

6.		What is the output of the following code? public class Test { public static void main(String args[]) { int x = 10; int y = 5; int z = x + y; System.out.println("The sum of " + x + " and " + y + " is " + z); } }

The sum of 10 and 5 is 15

The sum of x and y is z

The sum of x and y is 15

No output

7.		Which of the following is NOT a valid way to create a thread in Java?

Implementing the Runnable interface

Extending the Thread class

Calling the start() method on a Thread object

Creating a new instance of the Thread class

8.		What is the output of the following code? public class Test { public static void main(String args[]) { int x = 5; int y = 2; System.out.println(x / y); } }

2

2.5

2

None of the above

9.		What is the output of the following code? public class Test { public static void main(String args[]) { String name = "Java"; System.out.println(name.substring(1, 3)); } }

Ja

av

Jav

No output

10.		What is the output of the following code? public class Test { public static void main(String args[]) { String name = "Java"; for(int i = 0; i < name.length(); i++) { System.out.print(name.charAt(i) + " "); } } }

J a v a

Java

Jv

No output