JAVA ONE LINER PART 07

JAVA ONE LINER PART 07

1.The Java interpreter is used for the execution of the source code.
a)True                
b)False
Ans: a.

2) On successful compilation a file with the class extension is created.
a) True               
b) False
Ans: a.

3) The Java source code can be created in a Notepad editor.
a) True                 
b) False
Ans: a.

4) The Java Program is enclosed in a class definition.
a) True                 
b) False
Ans: a.

5) What declarations are required for every Java application?
Ans: A class and the main( ) method declarations.

6) What are the two parts in executing a Java program and their purposes?
Ans: Two parts in executing a Java program are:
Java Compiler and Java Interpreter.
The Java Compiler is used for compilation and the Java Interpreter is used for execution of the application.

7) What are the three OOPs principles and define them?
Ans : Encapsulation, Inheritance and Polymorphism are the three OOPs
Principles.
Encapsulation:
Is the Mechanism that binds together code and the data it manipulates, and keeps both safe from outside interference and misuse.
Inheritance:
Is the process by which one object acquires the properties of another object.
Polymorphism:
Is a feature that allows one interface to be used for a general class of actions.

8) What is a compilation unit?
Ans : Java source code file.

9) What output is displayed as the result of executing the following statement?
a) System.out.println("// Looks like a comment.");
b) // Looks like a comment
c) The statement results in a compilation error
d) Looks like a comment
e) No output is displayed
Ans : a.

10) In order for a source code file, containing the public class Test, to successfully compile, which of the following must be true?
a) It must have a package statement
b) It must be named Test.java
c) It must import java.lang
d) It must declare a public class named Test
Ans : b