Java Programming Language Module 2

Questions and Answers

What was the original name of the Java programming language?

Oak (correct)

JavaScript

Tree

Elm

Java was initially created for developing gaming applications.

False

In what year was Java launched as a programming language for the Internet?

1995

Java supports ________ programming which allows for reusability and modular design.

object-oriented Signup and view all the answers

Match the following Java design goals with their descriptions:

Simple = Easier to learn than C/C++ Secure = Built-in support for compile-time and run-time security Portable = Write once, run anywhere (WORA) Multithreaded = Supports simultaneous execution of multiple threads Signup and view all the answers

What is one of the main advantages of Java regarding where it can operate?

It is platform independent. Signup and view all the answers

The Java Virtual Machine (JVM) executes bytecodes, enabling Java's portability.

True Signup and view all the answers

Who was the creator of the Java programming language?

James Gosling Signup and view all the answers

What does a variable of a certain class actually declare?

A reference variable to an object Signup and view all the answers

A primitive variable holds the address of its data in memory.

False Signup and view all the answers

What keyword is used to declare a symbolic constant in Java?

final Signup and view all the answers

The value of a symbolic constant cannot be changed after it is assigned a value, i.e., attempting to reassign a value will result in a _______.

semantic error Signup and view all the answers

Match the types of operators with their descriptions:

Arithmetic Operators = Used for mathematical calculations Relational Operators = Used to compare two values Logical Operators = Used to combine boolean expressions Conditional Operators = Used for shorthand if-else statements Signup and view all the answers

In the example given, what does the variable 'name' hold?

The address where 'Hello' is stored Signup and view all the answers

In Java, operators have a precedence rule that influences the order of evaluation.

True Signup and view all the answers

What is the purpose of using a symbolic constant in programming?

To represent fixed values that should not change throughout the program. Signup and view all the answers

What is the codename for Java SE 6?

Mustang Signup and view all the answers

Java EE is designed for developing applications on resource-constrained devices.

False Signup and view all the answers

What feature was introduced in Java 8?

Lambda Expression Signup and view all the answers

Java ME stands for Java __________ Edition.

Micro Signup and view all the answers

Match the following Java editions with their primary purpose:

Java SE = Basic Java platform development Java EE = Enterprise-scale applications Java ME = Resource-constrained devices Java Card = Secure applets on smart cards Signup and view all the answers

Which type of Java program is designed to run on web pages?

Applet Signup and view all the answers

The most current stable version of Java is Java 14.

True Signup and view all the answers

Which Java program type provides dynamic content for web servers?

Servlet Signup and view all the answers

What is the primary purpose of the Java Virtual Machine (JVM)?

To interpret bytecode into machine language Signup and view all the answers

The Java API contains a limited number of library classes.

False Signup and view all the answers

What command is used to compile a Java program?

javac Signup and view all the answers

The package that provides input and output capabilities is called ______.

java.io Signup and view all the answers

Match the following Java platform tools with their functions:

javac = Compiler java = Bytecode interpreter (JVM) jdb = Debugger javadoc = Documentation tool Signup and view all the answers

Which of the following Java API packages is used for network access?

java.net Signup and view all the answers

J2SE 5.0 is also known as Java 2 Platform.

False Signup and view all the answers

What codename was given to JDK 1.4?

Merlin Signup and view all the answers

What does the operator '>' signify?

op1 is greater than op2 Signup and view all the answers

The expression 'k < j' evaluates to true if k is less than j.

True Signup and view all the answers

What is the result of evaluating the expression 'j >= i' if j equals 5 and i equals 3?

true Signup and view all the answers

The operator '______' checks if one value is greater than or equal to another.

<blockquote> = </blockquote> Signup and view all the answers

Match the following relational operators with their descriptions:

<blockquote> = op1 is greater than op2 = = op1 is greater than or equal to op2 < = op1 is less than op2 <= = op1 is less than or equal to op2 </blockquote> Signup and view all the answers

What is the output of 'i < j' if i equals 2 and j equals 4?

true Signup and view all the answers

The expression 'i >= j' will be true if i is equal to j.

True Signup and view all the answers

If j equals 3 and x equals 3, what is the result of 'j < x'?

false Signup and view all the answers

The expression 'k >= j' is false if k is _______ than j.

less Signup and view all the answers

Which of the following relational operators will return false for values x = 7 and y = 7?

x > y Signup and view all the answers

Study Notes

Brief Background

Created in 1991 by James Gosling and others at Sun Microsystems.
Originally named Oak, intended for smart consumer electronics before changing to Java.
Launched in 1995 as a programming language for the Internet, gaining rapid popularity with the Web's rise.
Currently used by millions, operating on billions of devices globally, including computers and mobile phones.
Design goals include simplicity, security, distribution, object-oriented features, robustness, portability, and high performance.

The Java Technology

Java supports various application development similar to other conventional programming languages.
Java Virtual Machine (JVM): Interprets bytecode and converts it to machine language for different hardware platforms.
Java Application Programming Interfaces (Java API): A collection of prebuilt software components, organized into packages for versatile functionalities.
- Examples: java.lang for basic functions, java.io for input/output, java.util for utility classes, java.sql for database interactions, java.awt and javax.swing for GUI elements.
Java Platform Tools:
- javac: Compiler
- java: Bytecode interpreter
- jdb: Debugger
- javadoc: Documentation tool
- jar: Archive utility

Version History

Initial launch in May 1995, followed by several key versions:
- Jan 1996: JDK 1.0
- Feb 1998: JDK 1.1
- Dec 1998: J2SE 1.2 (Java 2 Platform)
- May 2000: J2SE 1.3
- Feb 2002: J2SE 1.4
- Sep 2004: J2SE 5.0 (Java 5)
- Java 8 introduced Lambda Expressions.
- Java 14 is the latest stable version.

Java Platform Editions

Java SE (Standard Edition): Basic Java development platform.
Java EE (Enterprise Edition): For distributed, multi-tier enterprise applications.
Java ME (Micro Edition): For resource-constrained devices like mobile phones and PDAs.
Java Card: Enables small applications to run securely on smart cards.

Types of Java Programs

Stand-alone Applications: Self-contained applications.
Applets: Small programs running within web browsers.
Servlets: Serve dynamic content for web servers.
Portlets: Components for web portals.
MIDlets: Intended for mobile devices like phones and PDAs.

Memory Management in Java

Primitive variables hold actual data; reference variables hold memory addresses of objects.
Example: int num = 10; stores 10 directly, while String name = "Hello"; holds the address of where "Hello" is stored.

Operators in Java

Different types: Arithmetic, relational, logical, and conditional operators, each following specific precedence rules.

Symbolic Constants

Defined with the final keyword, preventing reassignment.
Example: final double PI = 3.141592654; - changing PI after this declaration results in a semantic error.

Relational Operators

Used to compare values, yielding boolean results (true or false).
Key operators include >, >=, <, and <=.
Example Comparisons:
- j > i yields true or false based on their respective values.

Summary of Relational Operations

Operations compare integers stored in variables, and the output reflects their relationships, useful for decision-making in code.

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Description

Explore the origins and early development of the Java programming language, created by James Gosling and his team at Sun Microsystems in 1991. Understanding its initial purpose for platform independence in consumer electronics provides insight into its design principles and evolution.

Java Programming Language Module 2

Questions and Answers

What was the original name of the Java programming language?

Java was initially created for developing gaming applications.

In what year was Java launched as a programming language for the Internet?

Java supports ________ programming which allows for reusability and modular design.

Match the following Java design goals with their descriptions:

What is one of the main advantages of Java regarding where it can operate?

The Java Virtual Machine (JVM) executes bytecodes, enabling Java's portability.

Who was the creator of the Java programming language?

What does a variable of a certain class actually declare?

A primitive variable holds the address of its data in memory.

What keyword is used to declare a symbolic constant in Java?

The value of a symbolic constant cannot be changed after it is assigned a value, i.e., attempting to reassign a value will result in a _______.

Match the types of operators with their descriptions:

In the example given, what does the variable 'name' hold?

In Java, operators have a precedence rule that influences the order of evaluation.

What is the purpose of using a symbolic constant in programming?

What is the codename for Java SE 6?

Java EE is designed for developing applications on resource-constrained devices.

What feature was introduced in Java 8?

Java ME stands for Java __________ Edition.

Match the following Java editions with their primary purpose:

Which type of Java program is designed to run on web pages?

The most current stable version of Java is Java 14.

Which Java program type provides dynamic content for web servers?

What is the primary purpose of the Java Virtual Machine (JVM)?

The Java API contains a limited number of library classes.

What command is used to compile a Java program?

The package that provides input and output capabilities is called ______.

Match the following Java platform tools with their functions:

Which of the following Java API packages is used for network access?

J2SE 5.0 is also known as Java 2 Platform.

What codename was given to JDK 1.4?

What does the operator '>' signify?

The expression 'k < j' evaluates to true if k is less than j.

What is the result of evaluating the expression 'j >= i' if j equals 5 and i equals 3?

The operator '______' checks if one value is greater than or equal to another.

Match the following relational operators with their descriptions:

What is the output of 'i < j' if i equals 2 and j equals 4?

The expression 'i >= j' will be true if i is equal to j.

If j equals 3 and x equals 3, what is the result of 'j < x'?

The expression 'k >= j' is false if k is _______ than j.

Which of the following relational operators will return false for values x = 7 and y = 7?

Study Notes

Brief Background

The Java Technology

Version History

Java Platform Editions

Types of Java Programs

Memory Management in Java

Operators in Java

Symbolic Constants

Relational Operators

Summary of Relational Operations

Studying That Suits You

Description

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