Java Second week learning experience

Time in a hurry, the second week of study on the past, for the Java program is not familiar with the writing

The Java Virtual machine JVM is the biggest feature of the Java language, and the JVM is a virtual computing system that can run Java bytecode. It has an interpreter component that enables the communication between Java bytecode and computer operating systems. It also includes a set of registers, a stack, a garbage-collected heap, and a storage method domain. The JVM masks information related to the operating system platform so that Java programs can run without modification on multiple platforms simply by generating bytecode that runs on a Java virtual machine. This is also the biggest feature of Java cross-platform, that is, a write, run everywhere. When the JVM executes the bytecode, it actually eventually interprets the bytecode as a machine instruction execution on a specific platform. The instruction set for compiling the virtual machine is very similar to the instruction set of the compiled microprocessor.

The basic components of a Java program are classes, which can include properties and methods in the class body. Each application must contain a main () method, and the class containing the main () method is called the main class.

Java Second week learning experience