Some Important Over Java Basics Questions
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Explore the fundamentals of Java through this engaging quiz titled 'Some important over Java Basics questions'. It assesses knowledge on object-oriented programming, data types, constants, and basic Java syntax, along with a practical task to calculate the area of a circle.
- 1.
Java is
- A.
A island
- B.
An object oriented programming language
- C.
A binary language
- D.
An assembler
Correct Answer
B. An object oriented programming languageExplanation
Java is an object-oriented programming language because it is designed to organize and structure code around objects, which are instances of classes. It supports the principles of encapsulation, inheritance, and polymorphism, allowing developers to create modular and reusable code. Java also provides features like classes, objects, methods, and interfaces to facilitate object-oriented programming.Rate this question:
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- 2.
The main method is the first executed after the constructor method executes
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the constructor method is the first method that is executed when an object is created. The main method, on the other hand, is the entry point of a Java program and is called by the Java Virtual Machine (JVM) after the constructor method has executed.Rate this question:
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- 3.
Which is not a data type
- A.
Integer
- B.
String
- C.
Variable
- D.
Boolean
- E.
Character
Correct Answer
C. VariableExplanation
The given options consist of different data types. Integer, String, boolean, and character are all valid data types. However, "variable" is not a data type itself, but rather a way to store and manipulate data of different types. Variables can hold values of various data types such as integers, strings, booleans, or characters.Rate this question:
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- 4.
A constant is declared by using the keyword
- A.
Int
- B.
Double
- C.
MAX
- D.
Final
Correct Answer
D. FinalExplanation
A constant is declared by using the keyword "final". The keyword "final" is used in Java to declare a variable that cannot be changed once it has been assigned a value. This means that the value of a final variable remains constant throughout the program. Using the "final" keyword ensures that the variable cannot be accidentally modified, providing consistency and preventing unintended changes to the value.Rate this question:
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- 5.
What does the println function do
- A.
Print out the program
- B.
Print the line of the output in the console
- C.
Execute a method
- D.
Print a statement from printer
Correct Answer
B. Print the line of the output in the consoleExplanation
The println function is used to print a line of output in the console. It is commonly used in programming languages like Java or Python to display information to the user. When the println function is called, it prints the specified message or variable to the console, allowing the user to see the output of the program. This is different from simply executing a method or printing a statement from a printer.Rate this question:
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- 6.
Write a program which produce the following output The radius is 7cm PI is 3.14 Area of the circle is 38.465sqcm
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Current Version
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May 06, 2024Quiz Edited by
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Jan 26, 2012Quiz Created by
Tahinenippon
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