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public class Jb01_HelloWorld //类名与文件名保持一致，由26个大小写字母、数字及_$组成。不能以数字开头，禁止使用关键字，
{
//定义主函数
public static void main(String[] args) //args即arguments
System.out.println("HelloWorld"); //打印输出HelloWorld,ln表示换行!
//public class等表示关键字，由Java定义
}
