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public class student{
private String name = "me";
private int age=18;
private int height=164;
private int weight=120;
private int num=3;
public student(String m,int a,int h,int w,int n){
name = m;
age=a;
height=h;
weight=w;
num=n;
}
public void display(){
System.out.println("my name is "+name);
System.out.println("my age is "+age);
System.out.println("my height is "+height);
System.out.println("my weight is "+weight);
System.out.println("my xuehao is "+num);
}
}

class go{
public static void main(String[] args){
//内建基本数据类型，声明的同时已经分配内存空间
int i;
//初始化，仅仅是给这个变量赋以一定的值
i=0;
//用户自定义的数据类型，声明的同时并没有分配内存空间
student xiaoming;
//初始化用户自定义类型的变量
//通过调用new操作运算符：首先分配内存存空间，然后初始化
//一个类的变量或对象(称作这个类的实例)
xiaoming = new student("Mr.Ming",88,187,240,7);
xiaoming.display();

System.out.println();
student zhang = new student("Miss.Z",18,168,100,1);
zhang.display();
}

}