设计一个User类，并定义类的三个构造方法，类中有三个变量有用户名、口令、记录用户个数

class User{
private String name;
private String key;
private static int num;

public User(String name,String key){
this.setName(name);
this.setKey(key);

}
public void setName(String n){
name=n;
}
public void setKey(String k){
key=k;
}
public String getName(){
return name;
}
public String getKey(){
return key;
}

public void info(){
num++;
System.out.println("用户名："+name+",登录口令："+key+",用户个数："+num);
}

}
public class Test{
public static void main(String[] args){

User d1=new User("张三","A1234");
d1.info();
User d2=new User("李四","12342");
   d2.info();
User d3=new User("李四","12342");
   d3.info();



}
}