Question 1

Under what circumstances might you use the yield method of the Thread class

Accepted Answer

The yield method is used to allow other threads of the same or higher priority to run by pausing the currently running thread.

Question 2

Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?

Accepted Answer

The correct method to suggest garbage collection in Java is System.gc().

Question 3

A class that cannot be a subclass is called as______ class.

Accepted Answer

A class declared as final cannot be subclassed. This is a feature of many object-oriented languages, including Java, to prevent further inheritance.

Question 4

When method defined in subclass which has same signature as a method in a super class, it is known as method

Accepted Answer

Method overriding occurs when a subclass defines a method that has the same name and signature as a method in its superclass, allowing the subclass to provide a specific implementation for the method.

Question 5

Which of the following statement is correct?

Accepted Answer

A is correct because for positive numbers, both >> (signed right shift) and >>> (unsigned right shift) operators produce the same result since the sign bit is 0 in both cases.

Question 6

Java language has support for which of the following types of comment ?

Accepted Answer

Java supports three types of comments: block comments (/* ... */), line comments (// ...), and Javadoc comments (/** ... */), which are used to generate documentation.

Question 7

Consider the following program:
Import myLibrary.*;
Public class ShowSomeClass
{
// code for the class...
}
What is the name of the java file containing this program?

Accepted Answer

In Java, the name of the file must match the name of the public class it contains. Since the public class in this program is named "ShowSomeClass", the file must be named "ShowSomeClass.java".

Question 8

Which of the following is TRUE?

Accepted Answer

A class in Java always has at least one constructor. If no constructor is explicitly defined by the programmer, the Java compiler automatically provides a default no-argument constructor, ensuring that the class can be instantiated.

Question 9

Consider the following code snippet
String river = new String("Columbia");
System.out.println(river.length());
What is printed?

Accepted Answer

The length of the string "Columbia" is 8, so when calling the length() method on the string object, it returns 8.

Question 10

What is different between a Java applet and a Java application?

Accepted Answer

Java applets are designed to run in a browser environment and have restrictions for security reasons, such as limited access to the local filesystem, whereas Java applications are standalone programs with fewer restrictions.

Question 11

You read the following statement in a Java program that compiles and executes.
Submarine.dive(depth);
What can you say for sure?

Accepted Answer

"dive" must be a method because the syntax Submarine.dive(depth); indicates calling a method named "dive" on the class or object "Submarine" with "depth" as its argument.

Question 12

Consider
Public class MyClass
{
Public MyClass(){/*code*/
}
// more code...
}
To instantiate MyClass, you would write?

Accepted Answer

Option A is correct because in Java, to create an instance of a class, you use the `new` keyword followed by the class constructor.

Question 13

In Java Inheritance

Accepted Answer

Inheritance in Java allows a new class to inherit properties and methods from an existing class, making option C correct. Options A and B are incorrect because fields in a class can have any access modifier (private, protected, public, or package-private), not just private or protected.

Question 14

When does Exceptions in Java arises in code sequence?

Accepted Answer

Exceptions in Java arise at run time, not during compilation. They are used to handle errors and other exceptional events that occur while a program is running.

Question 15

Which of these keywords is not a part of exception handling?

Accepted Answer

The correct keyword used in exception handling for throwing an exception is "throw", not "thrown". "Try", "finally", and "catch" are all part of exception handling syntax in many programming languages like Java and C#.

Question 16

Which of these keywords is used to manually throw an exception?

Accepted Answer

The keyword "throw" is used to manually throw an exception in many programming languages, including Java and C#.

Quiz 8: Java Thread Class, Exception Handling, and Garbage Collection

Under what circumstances might you use the yield method of the Thread class

Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?

A class that cannot be a subclass is called as______ class.

When method defined in subclass which has same signature as a method in a super class, it is known as method

Which of the following statement is correct?

Java language has support for which of the following types of comment ?

Consider the following program: Import myLibrary.*; Public class ShowSomeClass { // code for the class... } What is the name of the java file containing this program?

Which of the following is TRUE?

Consider the following code snippet String river = new String("Columbia") ; System.out.println(river.length() ) ; What is printed?

What is different between a Java applet and a Java application?

You read the following statement in a Java program that compiles and executes. Submarine.dive(depth) ; What can you say for sure?

Consider Public class MyClass { Public MyClass() {/code/ } // more code... } To instantiate MyClass, you would write?

In Java Inheritance

When does Exceptions in Java arises in code sequence?

Which of these keywords is not a part of exception handling?

Which of these keywords is used to manually throw an exception?

Quiz 8: Java Thread Class, Exception Handling, and Garbage Collection

Under what circumstances might you use the yield method of the Thread class

Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?

A class that cannot be a subclass is called as______ class.

When method defined in subclass which has same signature as a method in a super class, it is known as method

Which of the following statement is correct?

Java language has support for which of the following types of comment ?

Consider the following program: Import myLibrary.*; Public class ShowSomeClass { // code for the class... } What is the name of the java file containing this program?

Which of the following is TRUE?

Consider the following code snippet String river = new String("Columbia") ; System.out.println(river.length() ) ; What is printed?

What is different between a Java applet and a Java application?

You read the following statement in a Java program that compiles and executes. Submarine.dive(depth) ; What can you say for sure?

Consider Public class MyClass { Public MyClass() {/*code*/ } // more code... } To instantiate MyClass, you would write?

In Java Inheritance

When does Exceptions in Java arises in code sequence?

Which of these keywords is not a part of exception handling?

Which of these keywords is used to manually throw an exception?

Consider Public class MyClass { Public MyClass() {/code/ } // more code... } To instantiate MyClass, you would write?