Question 1 of 25
Hints left: 3
Q1
In Java, what is the purpose of the final keyword when applied to a class?
Q2
Which statements are most accurate regarding the following classes? class A{ private int i; protected int j; } class B extends A{ private int k; protected int m; }
Q3
Which keyword is used to explicitly specify that a method should be overridden in a subclass?
Q4
What will be the output? public class Test{ public static void main(String[] args){ String value = "abc"; changeValue(value); System.out.println(value); } public static void changeValue(String a){ a = "xyz"; } }
Q5
A package is a collection of
Q6
What is the access level of a class member declared as protected in Java?
Q7
What is the result of compiling and running the following code? public class Tester{ static int x = 4; public Tester(){ System.out.print(this.x); // line 1 Tester(); } public static void Tester(){ // line 2 System.out.print(this.x); // line 3 } public static void main(String... args){ // line 4 new Tester(); } }
Q8
Determine output: public class InitDemo{ static int i = demo(); static{ System.out.print(i); } InitDemo(){ System.out.print("hello1"); } public static void main(String... args){ System.out.print("Hello2"); } static int demo(){ System.out.print("InsideDemo"); return 10; } }
Q9
Determine Output: class MyClass{ static final int a = 20; static final void call(){ System.out.println("two"); } static{ System.out.println("one"); } } public class Test{ public static void main(String args[]){ System.out.println(MyClass.a); } }
Q10
Choose the correct statement public class Circle{ private double radius; public Circle(double radius){ radius = radius; } }
Q11
What keyword is used to declare a variable that can be accessed without creating an instance of the class?
Q12
Which access modifier restricts a class member's visibility to only the same class, its package, and subclasses?
Q13
What is the output for the below code? public class A{ static{ System.out.println("static"); } { System.out.println("block"); } public A(){ System.out.println("A"); } public static void main(String[] args){ A a = new A(); } }
Q14
The object is created with new keyword
Q15
What is the result of compiling and running the following code? public class Tester{ static int x = 4; int y = 9; public Tester(){ System.out.print(this.x); // line 1 printVariables(); } public static void printVariables(){ System.out.print(x); // line 2 System.out.print(y); // line 3 } public static void main(String... args) { // line 4 new Tester(); } }
Q16
A method within a class is only accessible by classes that are defined within the same package as the class of the method. Which one of the following is used to enforce such restriction?
Q17
Choose the correct statement. Restriction on static methods are: I. They can only call other static methods. II. They must only access static data. III. They cannot refer this or super in any way.
Q18
Which keyword is used to declare a method that cannot be overridden in a subclass?
Q19
You have the following code in a file called Test.java class Base{ public static void main(String[] args){ System.out.println("Hello"); } } public class Test extends Base{} What will happen if you try to compile and run this?
Q20
What is the result of compiling and running the following code? class Base{ private Base(){ System.out.print("Base"); } } public class test extends Base{ public test(){ System.out.print("Derived"); } public static void main(String[] args){ new test(); } }
Q21
Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct?
Q22
Choose all the lines which if inserted independently instead of "//insert code here" will allow the following code to compile: public class Test{ public static void main(String args[]){ add(); add(1); add(1, 2); } // insert code here }
Q23
What will be the output? public class Test{ static{ int a = 5; } public static void main(String args[]){ new Test().call(); } void call(){ this.a++; System.out.print(this.a); } }
Q24
Which access modifier allows a class member to be accessed from any class in the same package but not from outside?
Q25
Consider the following two classes declared and defined in two different packages, what can be added in class B to form what considered a correct access to class A from main() method of class B? package subPackage; public class A { } package anotherPackage; // line 1 public class B{ public static void main(String[] args){ // line 2 } } 1. At line1 add noting; At line2 add: new A(); 2. At line 1 add: import package.*; at line 2 add : new subPackage.A(); 3. At line 1 add: import subPackage.*; at line 2 add : new A(); 4. At line 1 add: import subPackage.A; at line 2 add : new A();