How to generate jar package in java and realize single process operation

java file package jar run

Effective steps:

1.cmd to the current directory (the directory where the default package main class is located, as an example ) set classpath = the directory where the default package main class is located

2.javac main class name.java

3.java main class name

4. Write the manifest file

Manifest-Version: 1.0 
Created-By: 1.8.0 (Sun Microsystems Inc.) 
Main-Class: 主类名

created-by The version number is unknown -> Enter cmd and enter java -version

5.jar cfm custom.jar MANIFEST.MF *.class

6.custom A bat file (the batch file is the default entrance if it is occupied by the decompression application)

Contents: javaw -jar custom.jar

7. Double-click the bat file to get the two above The file can only be run on a computer with jdk installed

What are the basic data types of java

The basic data types of Java are divided into:

1. Integer type, used to represent Integer data type.

2. Floating point type, a data type used to represent decimals.

3. Character type. The keyword of character type is "char".

4. Boolean type is the basic data type that represents logical values.

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