OOP-Java-02
Java开发工具
Java开发工具(Java SE Development Kits,JDK)由Java API、Java运行环境(JRE,Java Runtime Environment)和一组建立、测试工具的Java实用程序等组成。其核心是Java API(Application Programming Interface)。
简单来讲:JDK=JRE+Tools, JRE=JVM+API
public class App2_1{ //主类
public static void main(String[] args){
System.out.println("Hello Java!");
}
}
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