Explore topic-wise MCQs in Java Programming.

This section includes 56 Mcqs, each offering curated multiple-choice questions to sharpen your Java Programming knowledge and support exam preparation. Choose a topic below to get started.

1.

Java does not allow nesting of methods. (TRUE / FALSE)

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
2.

What is the output of the below Java program with a final local variable?

A. 30
B. 20
C. 10
D. Compiler error
Answer» E.
Discussion
3.

What is the output of the Java program with static variables?

A. t6 BIRDS before=25
B. t6 BIRDS before=25
C. t6 BIRDS before=25
D. None
Answer» C. t6 BIRDS before=25
Discussion
4.

A static-method or a static-variable is shared among all instances of a class. (TRUE / FALSE)

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
5.

In Java, local variables are stored in __ memory and instance variables are stored in ___ memory.

A. Stack, Stack
B. Heap, Heap
C. Stack, Heap
D. Heap, Stack
Answer» D. Heap, Stack
Discussion
6.

A local variable declared inside a method can not be used in expressions without initializing it first. (TRUE / FALSE).

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
7.

What is the output of the below Java program with a "this" operator?

A. CAKES=5
B. CAKES=0
C. CAKES=10
D. Compiler error
Answer» D. Compiler error
Discussion
8.

A "this" operator used inside a Java method refers to ___ variable.

A. Global variable
B. Method local variable
C. Instance variable
D. None
Answer» D. None
Discussion
9.

What is the output of the below Java program with a void method?

A. SHOW Method 2
B. No output
C. Compiler error
D. None
Answer» B. No output
Discussion
10.

What is the output of the below Java program with an empty return statement?

A. SHOW Method..
B. No output
C. Compiler error
D. None
Answer» B. No output
Discussion
11.

Choose the correct identifier for a method name in Java.

A. 1show
B. $hide
C. *show$
D. 3_click
Answer» C. *show$
Discussion
12.

In Java, a method name can contain numbers from 2nd character onwards. (TRUE / FALSE).

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
13.

In Java, a method name can start with ___.

A. Alphabet
B. Underscore (_)
C. Dollar ($)
D. All the above
Answer» E.
Discussion
14.

In Java, a method name can not start with a ___.

A. number
B. # (pound)
C. - (hyphen)
D. All the above
Answer» E.
Discussion
15.

Java method signature is a combination of ___.

A. Return type
B. Method name
C. Argument List
D. All the above
Answer» E.
Discussion
16.

in Java, add a ___ to a constructor to convert it into a method.

A. if statement
B. static
C. return type
D. semicolon
Answer» D. semicolon
Discussion
17.

State TRUE or FALSE. A Java method can have the same name as the class name.

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
18.

All Java methods must have a return type. (TRUE / FALSE)

A. TRUE
B. FALSE
C. -
D. -
Answer» B. FALSE
Discussion
19.

A Java method is comparable to a __ in c language.

A. structure
B. union
C. function
D. enum
Answer» D. enum
Discussion
20.

Which statement, inserted at line 10, creates an instance of Bar?

A. Foo.Bar b = new Foo.Bar();
B. Foo.Bar b = f.new Bar();
C. Bar b = new f.Bar();
D. Bar b = f.new Bar();
Answer» C. Bar b = new f.Bar();
Discussion
21.

What is the output of this program, Command line execution is done as – “java Output command Line 10 A b 4 N”?

A. java
B. 10
C. 20
D. b
Answer» D. b
Discussion
22.

Which one create an anonymous inner class from within class Bar?

A. Boo f = new Boo(24) { };
B. Boo f = new Bar() { };
C. Bar f = new Boo(String s) { };
D. Boo f = new Boo.Bar(String s) { };
Answer» C. Bar f = new Boo(String s) { };
Discussion
23.

Which statement, if placed in a class other than MyOuter or MyInner, instantiates an instance of the nested class?

A. MyOuter.MyInner m = new MyOuter.MyInner();
B. MyOuter.MyInner mi = new MyInner();
C. MyOuter m = new MyOuter();MyOuter.MyInner mi = m.new MyOuter.MyInner();
D. MyInner mi = new MyOuter.MyInner();
Answer» B. MyOuter.MyInner mi = new MyInner();
Discussion
24.

After line 8 runs. how many objects are eligible for garbage collection?

A. 0
B. 1
C. 2
D. 3
Answer» C. 2
Discussion
25.

At what point is the Bar object, created on line 6, eligible for garbage collection?

A. after line 12
B. after line 14
C. after line 7, when doBar() completes
D. after line 15, when main() completes
Answer» C. after line 7, when doBar() completes
Discussion
26.

Where will be the most chance of the garbage collector being invoked?

A. After line 9
B. After line 10
C. After line 11
D. Garbage collector never invoked in methodA()
Answer» E.
Discussion
27.

When is the B object, created in line 3, eligible for garbage collection?

A. after line 5
B. after line 6
C. after line 7
D. There is no way to be absolutely certain.
Answer» E.
Discussion
28.

When is the Demo object eligible for garbage collection?

A. After line 7
B. After line 8
C. After the start() method completes
D. When the instance running this code is made eligible for garbage collection.
Answer» E.
Discussion
29.

After line 11 runs, how many objects are eligible for garbage collection?

A. 0
B. 1
C. 2
D. 3
Answer» D. 3
Discussion
30.

When is the Float object, created in line 3, eligible for garbage collection?

A. just after line 5
B. just after line 6
C. just after line 7
D. just after line 8
Answer» D. just after line 8
Discussion
31.

In the below code, which call to sum() method is appropriate?

A. only sum(10)
B. only sum(10,20)
C. only sum(10) & sum(10,20)
D. all of the mentioned
Answer» E.
Discussion
32.

Which function is used to perform some action when the object is to be destroyed?

A. finalize()
B. delete()
C. main()
D. none of the mentioned
Answer» B. delete()
Discussion
33.

Garbage Collection can be controlled by a program?

A. True
B. False
C. May be
D. Can't say
Answer» C. May be
Discussion
34.

What is not the use of “this” keyword in Java?

A. Passing itself to another method
B. Calling another constructor in constructor chaining
C. Referring to the instance variable when local variable has the same name
D. Passing itself to method of the same class
Answer» E.
Discussion
35.

What would be the output of the following snippet, if compiled and executed with command line “hello there”?

A. Compile time error
B. Output would be “hello”
C. Output would be “there”
D. Output would be “hello there”
Answer» B. Output would be “hello”
Discussion
36.

What is the output of the following snippet running with “java demo I write java code”?

A. The snippet compiles, runs and prints “java demo”
B. The snippet compiles, runs and prints “java code”
C. The snippet compiles, runs and prints “demo code”
D. The snippet compiles, runs and prints “I code”
Answer» E.
Discussion
37.

What is the output of below snippet run as $ java Demo –length 512 –breadth 2 -h 3 ?

A. 2 512 3
B. 2 2 3
C. 512 2 3
D. 512 512 3
Answer» D. 512 512 3
Discussion
38.

What would be the output of following snippet, if compiled and executed with command line argument “java abc 1 2 3”?

A. 1 2
B. 2 3
C. 1 2 3
D. Compilation error
Answer» C. 1 2 3
Discussion
39.

Can a class be declared with a protected modifier.

A. True
B. False
C. May be
D. Can't say
Answer» C. May be
Discussion
40.

What would be behaviour if the constructor has a return type?

A. Compilation error
B. Runtime error
C. Compilation and runs successfully
D. Only String return type is allowed
Answer» B. Runtime error
Discussion
41.

What would be the output of the following snippet, if attempted to compile and run this code with command line argument “java abc Rakesh Sharma”?

A. Compile time error
B. Compilation but runtime error
C. Compilation and output Rakesh :-Please pay Rs.2000
D. Compilation and output Sharma :-Please pay Rs.2000
Answer» B. Compilation but runtime error
Discussion
42.

Which of these is a correct statement about args in this line of code?public static void main(String args[])

A. args is a String
B. args is a Character
C. args is an array of String
D. args in an array of Character
Answer» D. args in an array of Character
Discussion
43.

What is the output of this program, Command line execution is done as – “java Output This is a command Line”?

A. java
B. Output
C. This
D. is
Answer» D. is
Discussion
44.

What is the output of this program, Command line exceution is done as – “java Output This is a command Line”?

A. java
B. is
C. This
D. command
Answer» E.
Discussion
45.

What would be the output of following snippet, if attempted to compile and execute?

A. The snippet compiles, runs and prints 0
B. The snippet compiles, runs and prints 1
C. The snippet does not compile
D. The snippet compiles and runs but does not print anything
Answer» E.
Discussion
46.

All the variables of interface should be?

A. default and final
B. default and static
C. public, static and final
D. protect, static and final
Answer» D. protect, static and final
Discussion
47.

All the variables of class should be ideally declared as?

A. private
B. public
C. protected
D. default
Answer» B. public
Discussion
48.

Which of the following statements are incorrect?

A. default constructor is called at the time of object declaration
B. Constructor can be parameterized
C. finalize() method is called when a object goes out of scope and is no longer needed
D. finalize() method must be declared protected
Answer» D. finalize() method must be declared protected
Discussion
49.

What is true about constructor?

A. It can contain return type
B. It can take any number of parameters
C. It can have any non access modifiers
D. Constructor cannot throw an exception
Answer» C. It can have any non access modifiers
Discussion
50.

What is the syntax of abstract class in java?

A. abstract A{}
B. abstract class A
C. abstract class A{}
D. abstract class A[]
Answer» D. abstract class A[]
Discussion