java初学问题:错误: 找不到或无法加载主类
编译一个java程序:package wanghf;public class Helloworld {public static void main(String[] args){System.out.println("Hello world!");}}编译正常:D:\workspace-java\wanghf\src\wanghf>javac Helloworld.java但执行报错:D:\workspace-java\wanghf\src\wanghf>java Helloworld.class错误: 找不到或无...