2-java基础语法（2-java basic syntax）.docVIP

2-java基础语法（2-java basic syntax） A review: Java development environment 1.JDK download, install, configure and test 2. to write a simple Java program, familiar with the general process of programming the basic structure and application program of Java java: # # create.Java source program compile Java source program (using the javac command) Java bytecode file - run, debug and test # Compile and run # #.Java - .Class - run results # Pay attention to details: (1) create.Java source program: Confirm the suffix.Java The class name and source file name strictly consistent, including the size of writing Must contain main method (main method signature: public static void main (String[] args) {}, memorizing, must be strictly consistent) (2) compile the Java source program Compile command syntax: javac class.Java can be expressed as a javac source program name (including suffix) (3) run the Java bytecode file Run command syntax: Java class name (not including the suffix, the actual implementation of the corresponding class name of the.Class file) Java Applet program, called Java applets are generally embedded in web pages, out of date, now very rare, basically do not. The basic structure of Java Application program Public class {class name / / the main method Public static void main (String[] args) { The main body of the program / / } } The source file name: class name.Java The basic grammar Java Teaching contents: 1. the basic structure of the Java program 2. variables and constants 3. data types and type conversion 4. operator 5. three kinds of program structure: sequence, condition, circulation 6. array The 7. method This course should be very easy to master, Java C is still the essence of language language, basic grammar comes from the basic C language, in addition to the array declaration syntax. The basic structure of the 1. Java program The source file name: class name.Java Source program: Public class {class name / / the main method Public static void main (Str