JAVA Paper Solution
Que. Explain the Features of Java (or Java Buzzwords) Ans. Simple Secure Portable Object-oriented Robust Multithreaded Architecture-neutral Interpreted High performance Distributed Dynamic Simple Java was designed to be easy for the professional programmer to learn and use effectively. If we already understand the basic concepts of object-oriented programming, learning Java will be even easier.
Because Java inherits the C/C++ syntax and many of the object-oriented features of C++, most programmers have little trouble learning Java. Secure Most users worried about the possibility of infecting their systems with a virus. This type of program can gather private information, such as credit card numbers, bank account balances, and passwords, by searching the contents of your computer‟s local file system. Java answers of these concerns by providing a “firewall” between a networked application and your computer. (Prof. Viral S. Patel) When we use a Java-compatible Web browser, we can safely download Java applets without fear of viral infection or malicious intent. Java achieves this protection by confining a Java program to the Java execution environment and not allowing it access to other parts of the computer. Portable Many types of computers and operating systems are in use throughout the world—and many are connected to the Internet. For programs to be dynamically downloaded to all the various types of platforms connected to the Internet, some means of generating portable executable code is needed. Java interpretation of bytecode is the easiest way to create truly portable programs. Robust Two of the main reasons for program failure: memory management mistakes and mishandled exceptional conditions (run-time errors). The program must execute reliably in a variety of systems. Java is robust as deallocation is completely automatic in Java, because Java provides garbage collection for unused objects and providing object-oriented exception handling. Multithreaded Java supports multithreaded programming, which allows to write programs that do many things simultaneously. The Java run-time system comes with an elegant yet sophisticated solution for multiprocess synchronization that enables you to construct smoothly running interactive systems. Architecture-Neutral A central issue for the Java designers was that of code longevity and portability. One of the main problems facing programmers is that no guarantee exists that if you write a program today, it will run tomorrow—even on the same machine. Operating system upgrades, processor upgrades, and changes in core system resources can all combine to make a program malfunction. The Java designers made several hard decisions in the Java language and the Java Virtual Machine in an attempt to alter this situation. Their goal was “write once; run anywhere, any time, forever.” Interpreted and High Performance Java enables the creation of cross-platform programs by compiling into an intermediate representation called Java bytecode. This code can be interpreted on any system that provides a Java Virtual Machine.
Java, however, was designed to perform well on very low-power CPUs. As explained earlier, while it is true that Java was engineered for interpretation, the Java bytecode was carefully designed so that it would be easy to translate directly into native machine code for very high performance by using a just-in-time compiler. Distributed Java is designed for the distributed environment of the Internet, because it handles TCP/IP protocols. Java allowed objects on two different computers to execute procedures remotely. Java revived these interfaces in a package called Remote Method Invocation (RMI). This feature brings client/server programming. Dynamic Java programs carry with them substantial amounts of run-time type information that is used to verify and resolve accesses to objects at run time. This is crucial to the robustness of the applet environment, in which small fragments of bytecode may be dynamically updated on a running system.
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Que. Explain the Features of Java (or Java Buzzwords)
Ans.
Simple
Secure
Portable
Object-oriented
Robust
Multithreaded
Architecture-neutral
Interpreted
High performance
Distributed
Dynamic
Simple
Java was designed to be easy for the professional programmer to learn and use effectively. If
we already understand the basic concepts of object-oriented programming, learning Java will be
even easier.
Because Java inherits the C/C++ syntax and many of the object-oriented features of C++,
most programmers have little trouble learning Java.
Secure
Most users worried about the possibility of infecting their systems with a virus. This type of
program can gather private information, such as credit card numbers, bank account balances, and
passwords, by searching the contents of your computer‟s local file system.
Java answers of these concerns by providing a “firewall” between a networked application
and your computer. (Prof. Viral S. Patel)
When we use a Java-compatible Web browser, we can safely download Java applets without
fear of viral infection or malicious intent.
Java achieves this protection by confining a Java program to the Java execution environment
and not allowing it access to other parts of the computer.
Portable
Many types of computers and operating systems are in use throughout the world—and many
are connected to the Internet. For programs to be dynamically downloaded to all the various
types of platforms connected to the Internet, some means of generating portable executable code
is needed. Java interpretation of bytecode is the easiest way to create truly portable programs.
Robust
Two of the main reasons for program failure: memory management mistakes and mishandled
exceptional
conditions (run-time errors). The program must execute reliably in a variety of systems.
Java is robust as deallocation is completely automatic in Java, because Java provides garbage
collection for unused objects and providing object-oriented exception handling.
Multithreaded
Java supports multithreaded programming, which allows to write programs that do many
things simultaneously. The Java run-time system comes with an elegant yet sophisticated
solution for multiprocess synchronization that enables you to construct smoothly running
interactive systems.
Architecture-Neutral
A central issue for the Java designers was that of code longevity and portability. One of the
main problems facing programmers is that no guarantee exists that if you write a program today,
it will run tomorrow—even on the same machine. Operating system upgrades, processor
upgrades, and changes in core system resources can all combine to make a program malfunction.
The Java designers made several hard decisions in the Java language and the Java Virtual
Machine in an attempt to alter this situation. Their goal was “write once; run anywhere, any
time, forever.”
Interpreted and High Performance
Java enables the creation of cross-platform programs by compiling into an intermediate
representation called Java bytecode. This code can be interpreted on any system that provides a
Java Virtual Machine.
Java, however, was designed to perform well on very low-power CPUs. As explained earlier,
while it is true that Java was engineered for interpretation, the Java bytecode was carefully
designed so that it would be easy to translate directly into native machine code for very high
performance by using a just-in-time compiler.
Distributed
Java is designed for the distributed environment of the Internet, because it handles TCP/IP
protocols. Java allowed objects on two different computers to execute procedures remotely. Java
revived these interfaces in a package called Remote Method Invocation (RMI). This feature
brings client/server programming.
Dynamic
Java programs carry with them substantial amounts of run-time type information that
is used to verify and resolve accesses to objects at run time. This is crucial to the robustness
of the applet environment, in which small fragments of bytecode may be dynamically
updated on a running system.
Click blow link for download
Click blow link for download
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