安装javac
$ sudo apt-get install openjdk-8-jdk
$ java -version
openjdk version "1.8.0_275"
OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~18.04-b01)
OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)
编辑测试java程序
$ vi HelloWorld.java
public class HelloWorld{
public static void main(String[] args){
System.out.println("Hello World");
}
}
$ javac HelloWorld.java
$ ls
HelloWorld.class HelloWorld.java
$ java HelloWorld
Hello World