➖The work of compiler is, it compares user declared java program with standard java syntex(present inside java library).
➖This comparison is perform to detect syntactical mistakes. If any mistakes perform then compiler display fully qualified mistakes on screen.
➖If no mistakes perform, then compiler generate new file(compilation successful)
➖The newly generated file is considered to be as .class file or intermediate file.
➖The content of .class file is bytecode.
➖Once .class file is generated programmer need to invoke JRE or JVM for execution.
➖The below declared cmd is used to invoke JRE or JVM.
java ClassName
➖This comparison is perform to detect syntactical mistakes. If any mistakes perform then compiler display fully qualified mistakes on screen.
➖If no mistakes perform, then compiler generate new file(compilation successful)
➖The newly generated file is considered to be as .class file or intermediate file.
➖The content of .class file is bytecode.
➖Once .class file is generated programmer need to invoke JRE or JVM for execution.
➖The below declared cmd is used to invoke JRE or JVM.
java ClassName
➖JRE is just a folder name, inside JRE there is a powerful tool present called JVM (Java Virtual Machine).
➖JVM is responsible for executing .class file.
➖Inside JVM, there are three imp blocks. They are,
1. Class Loader
➖Responsible for loading .class file from system memory to JVM memory.
➖One .class file can be loaded only once throught lifetime of the app.
➖Class loader loads .class file only
➖JVM is responsible for executing .class file.
➖Inside JVM, there are three imp blocks. They are,
1. Class Loader
➖Responsible for loading .class file from system memory to JVM memory.
➖One .class file can be loaded only once throught lifetime of the app.
➖Class loader loads .class file only
2. Byte Code Checker
➖For security reason the loaded .class file is again cross verified in it.
➖For security reason the loaded .class file is again cross verified in it.
3. JIT - Just in Time Compiler
➖It is responsible for converting machine understandable language into user understandable language.
➖It performs the operation line by line and hence JIT is also known as interpreter.
➖It is responsible for converting machine understandable language into user understandable language.
➖It performs the operation line by line and hence JIT is also known as interpreter.
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Starting one Java programming batch from tomorrow at 9:00 am and will cover these topics.
1. Control statements
2. Loops
3. Logical numerical programs
4. Pattern programs
5. String - Array programs
6. One real time based project using collection framework.
Just in ₹ 499/-
Dm me or you can contact me on this number.
📱 : +91-9099887667