Java Programming Questions & Answers
My teacher gave me an assignment. It was about Java Programming. I completed it and now uploading it in my blog. It maybe helpful for the new Java programmers like me. It was given by Shah Mostafa Khaled (MTD) Sir as an assignment of CSE 135 (now known as CSE 215) course of North South University.- Why is Java a static language?
There are two forms of typed programming languages. One is
statically typed language and another is dynamically typed language. Statically
typed language requires you to declare what ‘type’ a variable is when you are writing
code. On the other hand, dynamically typed languages do not need to be declared
the type of the variable in the code.
Java is a statically typed language. Because all the type of variables inside the code must be declared. Moreover, Java is a well-established and old language. It is going through development. But the basic structures of the language and codes are the same for many years. They will remain almost same fort the next years. So, Java programmes written in twenty first century can be easily edited and supported in the future decades.
Java is a statically typed language. Because all the type of variables inside the code must be declared. Moreover, Java is a well-established and old language. It is going through development. But the basic structures of the language and codes are the same for many years. They will remain almost same fort the next years. So, Java programmes written in twenty first century can be easily edited and supported in the future decades.
- What is the benefit of it?
There are many benefits of static language. Suppose, someone wrote a code in dynamic language many years ago. A software is running with those codes. If the language is dynamic then the structure and rules of that language will change day by day. In the end, the coder will end up facing that his software is of no use for the current time. Upgrading the software may cause excessive costs. That’s why static language is better to use. It will remain almost same time to time.
Moreover, in statically typed language you have to declare
the type of an variable. This clears the confusion pretty early. Static
languages are fast and more reliable.
- What is Java Spec?
Java Spec is a complete reference to rules and conditions of
Java Language. Java Specifications Requests (JSRs) is formal documents that
describe proposed specifications and technologies for adding to the Java
platform. Formal public reviews of JSRs take place before a JSR becomes final
and the JCP Executive Committee votes on it. A
final JSR provides a reference implementation that is a
free implementation of the technology in source code form and a Technology Compatibility Kit to
verify the API
specification.
- How do changes come to Java Language?
Java is a community-based language. It is developed by not
only by a organization but also a bunch of users. These java users contribute
to the community and help tyo develop the language day by day. The changes in
the language occurs by the decision of the community members. If the members
agree to change something in the language then it is only considered to be
changed and developed.
- Is Java a compiled language or interpereted language?
Java is both a compiled language and interpreted language. Java uses a two
–step compilation process. First, Java source code is compiled into
‘’bytecode’’ by the Java compiler. The bytecode can be executed by Java Virtual
Machine (JVM). The current version of JVM is called Just In Time (JIT)
Compilation. Then the JIT compiler interpret the bytecode into native
instructions understood by the CPU to run the program.
- What is the difference between Compiled Language and Interpreted Language?
A compiled language is a programming language whose
implementations are generally compilers. It generates machine code from source
code. A compiler can translate the source code into some intermediate form
often called bytecode, which is then passed to an interpreter which executes
it. Compiled programs generally run faster than interpreted ones because
interpreted programs must be reduced to machine instructions at runtime.
An interpreted language is a programming language that executes
instructions directly, without previously compiling a program
into machine-language instructions. The interpreter executes the program directly,
translating each statement into a sequence of one or more subroutines
already compiled into machine code. An interpreted program runs slower than
compiled program because it translates every sequence of the code
simultaneously.
- What is JIT Compiler?
JIT Compiler is the short form for Just-In-Time Compiler. It
is a code generator that converts Java bytecode into machine language
instructions. Some Java Virtual Machine (JVM) have JIT Compiler included. Java
programs compiled by JIT runs much faster.
- How many commenting styles are there in Java? Give example.
There are three types of commenting styles in Java
programming.
1. 1. Single Line Comment: The simplest comment in
Java is the single line comment. It starts with two forward slashes and
continues to the end of the line.
Example: // This is a single line
comment.
2. Multi Line Comment: This type of comment starts with a forward slash followed by an asterisk, and end it with an asterisk followed by a forward slash.
Example: /* This is a
Multi
line
Commenting
style */
3.
3 3. Documentation Comment: This
type of comments begin with a forward slash followed by two asterisks, and end with an
asterisk followed by a forward slash.
Example: /** This is a documentation comment */
- Why main method is static in Java?
Main methos is static in Java Programming language. Java virtual machine can call it
without creating any instance of class which contains main methos. If main method
were not declared static then JVM has to create instance of main class and since
constructor can be overloaded and can have argumants there would not be any certain
and easy way for JVM to find main method in Java.
What is package in Java? Give example.
A Java package is a set of classes which are grouped together. Every class is part
of some package. All classes in a file are part of the same package.
Multiple files can specify the same package name. If no package is specified, the
classes in the files are stored into an unnamed package. If package name is specified,the
file must be in a subdirectory called the name which must match the package name.
Examples of Java Packages:
java.applet
java.awt
java.awt.color
java.awt.datatransfer
java.awt.dnd
java.awt.event
java.awt.font
java.awt.geom
java.awt.im
java.awt.im.spi
java.awt.image
java.awt.image.renderable
java.awt.print
java.beans
java.beans.beancontext
java.io
java.lang
java.lang.ref
java.lang.reflect
java.math
java.net
java.nio
java.nio.channels
java.nio.channels.spi
java.nio.charset
java.nio.charset.spi
Thanks Dost :D
ReplyDeleteThankyou brother.
ReplyDeleteI'm also MTD sir's student. This helped me a lot with the Assignment.
thans bro,,, really liked your artical,,,,very helpful and thanks a lot for your artical again.
ReplyDeletethans bro,,, really liked your article,,,,very helpful and thanks a lot for your article again.
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