How to compile and execute java using jar in cmd?

Question

我创建了一个Java文件，然后将其转换为jar，现在我想在另一个Java类中使用它，如何导入该jar以及如何编译和执行。

Answer 1

Given a "library" class pkg/LibClass.java :

package pkg;

public class LibClass {
    public static void sayHello() {
        System.out.println("Hello world");
    }
}

Compile and create a jar file:

$ javac pkg/LibClass.java 
$ jar cvf lib.jar pkg/LibClass.class
added manifest
adding: pkg/LibClass.class(in = 404) (out= 284)(deflated 29%)

(creates a lib.jar in the current directory)

Create an application that uses the library:

import pkg.LibClass;

public class MainClass {
    public static void main(String[] args) {
        LibClass.sayHello();
    }
}

Compile and run the application using lib.jar :

$ javac -cp lib.jar MainClass.java 
$ java -cp lib.jar:. MainClass

Answer 2

当另一个Java文件正在被编译/执行时，您需要在编译时和运行时使该jar文件在classpath中可用。

Answer 3

Set the jar in your class path or pass as an argument and compile or execute -

Compile - javac -classpath your.jar other.java

Execute - java -classpath your.jar other