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Test your Core Java skills



139 multiple choice questions to test your Core Java skills

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What Will I Learn?
  • ractice Tests 139 questions
  • Introduction, Javadoc comments, Variables, Data Types & Operators 20 questions
  • Control Statements:- if, switch-case and loops 18 questions
  • Arrays, for-each loop, Command-line args, Packages, Classpath & User-input 25 questions
  • Object Oriented Programming 41 questions
  • Java Exceptions 15 questions
  • String, StringBuilder, Wrapper classes and Enums 20 questions
Description
This course is for anyone who wants to test or brush up their core Java skills or  face java interviews. 
Java is the most popular language world wide and technologies like Servlets & JSP, J2EE, Struts, Spring, Hibernate, JMS or android for mobile applications are all based on core Java. 
Quizzes cover following topics:-
  • Java syntax and grammar
  • Javadoc and developer comments and their significance.
  • Variables, Data Types and Operators
  • Control Statements: if-else, switch-case and loops
  • Java arrays and Command-line arguments
  • Packages, classpath and User-input using Scanner
  • Classes, objects, constructors, initialization blocks, type of variables, methods and Garbage collection
  • Object Oriented Programming Concepts:
    • Encapsulation
    • Inheritance
    • Polymorphism
    • Abstraction
  • Access specifier, instanceof operator and casting
  • String, StringBuilder and Wrapper classes
  • Exception
  • Enumeration
Most of the Quiz questions are not straight forward. There are trick questions included to flex your java muscles. Some examples of quiz questions are provided below:-

Q1: What will be the result of compiling and executing following program?
//Test1.java
class Vehicle {
     public int getRegistrationNumber() {
         return 1;
     }
}
class Car {
     public int getRegistrationNumber() {
         return 2;
     }
}
public class Test1 {
     public static void main(String[] args) {
         Vehicle obj = new Car();
         System.out.println(obj.getRegistrationNumber());
     }
}
A. 1
B. 2
C. An exception is thrown at runtime.
D. Compilation error.
Answer: D

Q2: Below is the code of Test06.java file.
What will be the result of compiling and executing following program by using the command java Test06 RED AMBER
public class Test06 {
 enum TrafficLight {
      RED, YELLOW, GREEN;
 }
 
 public static void main(String[] args) {
      TrafficLight tl = TrafficLight.valueOf(args[1]);
      switch(tl) {
           case TrafficLight.RED:
                System.out.println("STOP");
                break;
           case TrafficLight.YELLOW:
                System.out.println("SLOW");
                break;
           case TrafficLight.GREEN:
                System.out.println("GO");
                break;
          }
     }
}
A. STOP
B. No output
C. IllegalArgumentException is thrown
D. None of the above
Answer: D

Q3: What will be the result of compiling and executing following program?
public class Test5 {
     public static void m1() {
          System.out.println("static method.");
     }
 
     public static void main(String[] args) {
          Test5 obj = null;
          obj.m1();
     }
}
A. NullPointerException is thrown.
B. Compilation error.
C. static method.
D. None of the above.
Answer: C
Who is the target audience?
  • Anyone who has basic java skills
  • Anyone looking for quick brush up on fundamentals through questions




Source: Udemy.com
Keyword: buy udemy credits how to get free course in udemy udemy first course udemy christmas udemy 10 euro

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