WeCP Java Quiz 1

Correct ans - Option C

Explanation - The Java language does not support pointers; some of the major reasons are listed below:

• One of the major factors of not using pointers in Java is security concerns. Due to pointers, most of the users consider C-language very confusing and complex. This is the reason why Green Team (Java Team members) has not introduced pointers in Java.


• Java provides an effective layer of abstraction to the developers by not using pointers in Java.

The correct output of the given code is Option D, as the first and third print statement are using print() function so the line will not be changed on their execution, but the second print statement is using println(), so when “I am a” is printed , the line will change after that, and hence PrepSter will be printed in a different line.

Correct ans - Option C

Explanation - The Java Debugger, jdb, is a simple command-line debugger for Java classes. It is a demonstration of the Java Platform Debugger Architecture that provides inspection and debugging of a local or remote Java Virtual Machine.

While solving the equation you need to keep in mind that the pre-increment and post-increment operators will be changing the value on each call of the variable, let's solve the equation step by step

++x = the value will be taken as 4

y++ = the value will be taken as 5, and then it will be incremented to 6

z-- = the value will be taken as 10, and then it will be decreased to 9

++x = the value is already 4, now it will be incremented to 5

So the equation will be

4 - 5 + 10 + 5 = 14

Correct ans - Option C

Explanation - Javadoc is a tool for generating API documentation in HTML format from doc comments in source code. It can be downloaded only as part of the Java 2 SDK. To see documentation generated by the Javadoc tool, go to J2SE 1.5.0 API Documentation.

Stack: Each thread has a private JVM stack, created at the same time as thread. It is used to store data and partial results which will be needed while returning value for method and performing dynamic linking. Java Stack stores frames and a new frame is created each time at every invocation of the method.
A frame is destroyed when its method invocation completes

Heap: It is the runtime data area in which the memory is allocated to the objects

Class(Method) Area:  It stores class level data of every class such as the runtime constant pool, field and method data, the code for methods.

The copy constructor is a constructor which creates an object by initializing it with an object of the same class, which has been created previously. Java supports for copy constructors but unlike C language, Java does not provide an explicit copy constructor you need to define it yourself

Correct ans - Option B

Explanation

In the Java programming language, a keyword is any one of 52 reserved words that have a predefined meaning in the language; because of this, programmers cannot use keywords as names for variables, methods, classes, or as any other identifier. Of these 52 keywords, 49 are in use, 1 is in preview, and 2 are not in use.

Correct ans = Option C

Explanation

We can use 2 special characters while initializing the variables those are ‘$’ and ‘_’, other than these you cannot use any special characters for initializing a variable.

When we compare two string without any predefined methods like equals()

Or compareTo() the strings are compared in case sensitive manner, that’s why the output for the above code is not equal.