Ques-1-> What is java?
Ans-> Java is a robust, platform Independence, object oriented and inherent programming language.It used to Develop a software it may be Desktop base application or webbased application.
Ques-2-> What is jvm?
Ans-> It’s a set of mechanism issued by Sun Microsystem or code execution component of the Java Platform. It covers…
- An Instruction Set (Java Assembly).
- Format of class file.
- Memory Management.
- Class loading mechanism.
- Implementation of JVM provided by a Vendor.
Ques-3-> What is jre?
Ans-> JRE (Java Runtime Environment): it checks weather the application is violating any rules already mentioned in JRE on not. JRE usually called a private runtime environment. It is implemented by JVM.
- Byte code verifier
- Class loader
- JITC (justin-time complier)
- Class library
- Memory management module
Ques-4-> What is jdk?
Ans-> it tools for developing, monitoring and debugging Javaapplication. In other words JDK is a tool that facilitates to compile, packaging, execute java program and core java library etc. JDK contains JRE + development tools.
Ques-5-> What is the diff b/w int and Integer.
Ans-> int is a data type while Integer is class.