Q.1
Which method is used to make main thread to wait for all child threads
  • Join ()
  • Sleep ()
  • Wait ()
  • Stop ()
Q.2
Which of these class is highest in hierarchy in java
  • java.lang.Exception
  • java.lang.Error
  • java.lang.Throwable
  • java.lang.Object
Q.3
When overloading a method, the method header ________ .
  • Must exactly match the header of the method you are overloading.
  • Must have the same name, but differ in order, number, or type of parameters.
  • Can differ in name, but must have the same number and order of parameters.
  • Can be completely different from the method you are overloading, but must have @Override.
Q.4
What are the legal indexes for the array ar, given the following declaration:int[] ar = {8 }
  • 0, 1, 2, 3
  • 1, 2, 3, 4
  • 2, 4, 6, 8
  • 0, 2, 4, 6
Q.5
Which of the following are not Java modifiers?
  • public
  • private
  • friend
  • transient
Q.6
_____________ are non graphic characters, which are used as commands to direct the cursor while printing.
  • Escape Sequences
Q.7
Q) Number of threads in below java program ispublic class ThreadExtended extends Thread { public void run() { System.out.println("\nThread is running now\n"); } public static void main(String[] args) { ThreadExtended threadE = new ThreadExtended(); threadE.start(); }}
  • 0
  • 1
  • 2
  • 3
Q.8
Class Demo1{public static void main(String args[]){int i[] = new int[10];System.out.println(i[10]);}}
  • 0
  • Garbage Value
  • Out-of-bounds exception
  • Error
Q.9
Which of the following is an example of a reference variable declaration?
  • int count;
  • String name;
  • float gpa;
  • char firstInitial;
Q.10
Which one is NOT the basic element of OOP?
  • Class
  • Abstraction
  • BlueJ
  • Polymorphism
Q.11
Find the output for the following.public class IncDec{ public static void main(String s[]) { int a = int b = int c; int d; c = ++b; d = a++; c++; System.out.println("a = " + a); System.out.print("b = " + b); System.out.println("c = " + c); System.out.print("d = " + d); }}
  • a = 2 b = 3 c = 4 d = 1
  • a = 2 b = 3 c = 4 d = 1
  • Program does not compile.
  • a = 1 b = 2 c = 4 d = 2
Q.12
Q) What is maximum thread priority in Java
  • 10
  • 12
  • 5
  • 8
Q.13
How would you declare a variable storing the tax rate?
  • int taxRate = 5.1;
  • taxRate = "5.1";
  • double taxRate = 5.1;
  • double taxRate = "5.1";
  • I do hereby declare thee Sir Tax Rate
Q.14
Inheritance is used when the relationship between two classes is a(n) _______ relationship.
  • "HAS-A"
  • "PART-OF-A"
  • "IS-A"
  • inverse
Q.15
What is sometimes also called a lightweight process?
  • Thread
  • Process
  • JVM
Q.16
Which of these keywords is used to make a class?
  • class
  • struct
  • int
  • none of the mentioned
Q.17
Which of these statement is incorrect?
  • Every class must contain a main() method
  • Applets do not require a main() method at all
  • There can be only one main() method in a program
  • main() method must be made public
Q.18
Which concept of Java is a way of converting real world objects in terms of class?
  • Polymorphism
  • Encapsulation
  • Abstraction
  • Inheritance
Q.19
Class dog implements the animal interface.Which IS a valid declaration?
  • Dog d = new Animal();
  • Animal d = new Dog();
  • Animal d = new Animal();
Q.20
If a priority of a java thread is 3 then the default priority of its child thread will be
  • 0
  • 1
  • 5
  • 3
0 h : 0 m : 1 s