Explain TreeSet?

Java Programming Language > Interface in java > Benefits of OOP

Short Question

577

Answer:

It is a Set implemented when we want elements in a sorted order.

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115. What is Comparable Interface?

Answer: It is used to sort collections and arrays of objects using the collections.sort() and java.utils. The objects of the class implementing the Comparable interface can be ordered.

# Tutorial: Benefits of OOP

Question: Array in java Short

116. Difference between throw and throws?

Answer: It includes:

Throw is used to trigger an exception where as throws is used in declaration of exception.
Without throws, Checked exception cannot be handled where as checked exception can be propagated with throws.

# Tutorial: Benefits of OOP
Question: Managing Errors and Exception Short

117. Explain the following line used under Java Program ? public static void main (String args[ ])

Answer: The following shows the explanation individually ?

public ? it is the access specifier.

static ? it allows main() to be called without instantiating a particular instance of a class.

void ? it affirns the compiler that no value is returned by main().

main() ? this method is called at the beginning of a Java program.

String args[ ] ? args parameter is an instance array of class String.

# Tutorial: Benefits of OOP
Question: Fundamentals of Object-Oriented Programming Short

118. Define JRE i.e. Java Runtime Environment?

Answer:
Java Runtime Environment is an implementation of the Java Virtual Machine which executes Java programs. It provides the minimum requirements for executing a Java application;

Java Runtime Environment (JRE) is a software platform that provides the necessary environment for running Java applications. It includes the Java Virtual Machine (JVM), libraries, and Java class files. JRE provides the resources and environment necessary for running Java programs, including memory management, security, and thread management. The JRE is responsible for executing compiled Java code and providing a secure and efficient runtime environment for Java applications.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

119. What is JAR file?

Answer: JAR files is Java Archive fles and it aggregates many files into one. It holds Java classes in a library. JAR files are built on ZIP file format and have .jar file extension.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

120. What is a WAR file?

Answer: This is Web Archive File and used to store XML, java classes, and JavaServer pages. which is used to distribute a collection of JavaServer Pages, Java Servlets, Java classes, XML files, static Web pages etc.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

121. Define JIT compiler?

Answer: It improves the runtime performance of computer programs based on bytecode.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

122. What is the difference between object oriented programming language and object based programming language?

Answer: Object based programming languages follow all the features of OOPs except Inheritance. JavaScript is an example of object based programming languages.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

123. What is the purpose of default constructor?

Answer: The java compiler creates a default constructor only if there is no constructor in the class.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

124. Can a constructor be made final?

Answer: No, this is not possible.

# Tutorial: Benefits of OOP
Question: Overview of Java Language Short

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