Java Programming Quiz

What is the role of the Garbage Collection?

• It frees heap memory by destroying unreachable objects.

• It deletes all the Java files available on the memory.

• It loads a Java program into memory.

• It checks the output of any Java program and deletes anything that does not make sense at all.

Which of the following are components of the Java platform?

• JVM(Java Virtual Machine), the java application programming interface (API)

• JVM(Java Virtual Machine), Java Run-time Environment

• JVM(Java Virtual Machine), java compiler

• Java compiler, java

To run a Java program, which the software must be installed?

• Java Runtime Environment (JRE)

• Eclipse

• Java Development Kit (JDK)

• Netbeans

What is the meaning of platform-independent?

• write once, run anywhere

• not easy to execute on any system after compilation.

• the execution of the program is restricted by the type of OS environment provided.

• All of the others

What is the role of the Java Development Kit (JDK) in java programming? Choose multiple correct answers.

• A cross-platformed software development environment that offers a collection of tools and libraries necessary for developing Java-based software applications.

• A core package used in Java programming, along with the JVM (Java Virtual Machine) and the JRE (Java Runtime Environment) to develop and deploy applications

• A software for building applications that combines common developer tools into a single graphical user interface (GUI).

• A text editor that can assist in writing software code with features such as syntax highlighting with visual cues

What is the file extension of Java source code?

• java

• .class

• .jar

• .rar

Which of the following related to the comment in Java is false?

• /* comments

• /* comment */

• /** comment */

• //comments

Which of the following is the entry point of the Java program?

• main method

• class method

• instance method

• static method

What is the default value of the data type double in Java?

• 0.0

• 0

• Null

• 1.0

• -1.0

What will be the output of the following code? public class Test1 { int x; x = 5; public static void main(String[] args) { Test1 t = new Test1(); System.out.println(t.x); }}}

• complie error

• runtime error

• 5

• 0