急求java程序,不管多简单的程序只要在每句后加上注释就行.

class Person{//"人"类
private String name;//姓名
private String sex;//性别
private String country;//国籍

public Person(){//构造函数
this.name = "手扶拖拉机司机";
this.sex = "不详";
this.country = "俄罗斯";
}

public String toString(){//重写Object的toString()方法
return "姓名:" + this.name + "\t性别:" + this.sex + "\t国籍:" + this.country;
}

public static void main(String[] args){//主函数
Person person = new Person();//实例化Person
System.out.println(person.toString());//输出控制台用以测试
}
}

楼上大大，你要回答的提问在下面两个catalog

public class Toy//创建类
{public static void main(String args[])
{System,out.println("Hello JAVA!");//输出Hello JAVA!
}
}

1.jdk1.5.0的下载地址
http://java.sun.com/j2se/1.5.0/download.jsp

2.jdk