定义一个Person类,其中包括:1.定义属性:姓名、年龄、民族作为成员变量。定义静态成员变量：人数2.定义构造方法：对成员变量进行初始化。3.定义多个方法：分别显示相应的属性值，例如getName(){System.out.print("名称="+name+"；"); }4.定义一个方法“成长”：实现年龄的增加，每执行一次年龄增加1 题目显示不全，完整题目描述：

完整代码如下:

package naizi;

class Person {

protected String Name;
protected int Age;
protected String Nationality;
public static int count=0;

Person(String Name,int Age,String Nationality){
	this.Name = Name;
	this.Age = Age;
	this.Nationality = Nationality;
	count++;
}

//显示属性值
public void getName() {
	System.out.println("Name="+Name+";");
}
public void getAge() {
	System.out.println("Age="+Age+";");
}
public void getNationality() {
	System.out.println("Nationality="+Nationality+";");
}

//成长方法
public void growUp(){
	Age++;
}

//显示人数方法
public void show(){
	System.out.println("Person count:"+count+";");
}
}


//定义Nationality接口 
interface Nationality{
	public void custom();
	public void policy();
}


//定义一个Student类继承Person类，实现Nationality接口
public class Student extends Person implements Nationality{

	//子类的新成员变量
	protected String Education;

	//子类的构造方法调用父类的构造方法
	Student(String Name,int Age,String Nationality,String Education){
		super(Name, Age, Nationality);
		this.Name = Name;
		this.Age = Age;
		this.Nationality = Nationality;
		this.Education = Education;
	}

	//构造方法的重载，并且默认如果一个学生没有传入民族，默认为汉族
	Student(String Name,String Education){
		this(Name, 0, "han", Education);
		this.Name = Name;
		this.Education = Education;
	}

	//覆盖父类的成长方法
	public void growUp(){
		if("Undergraduate".equals(Education)){
			System.out.println("Undergraduate;");
		}else {
			System.out.println("Postgraduate;");
		}
		Age++;
		super.growUp();
	}
	public void custom(){
		System.out.println("Spring Festival, Dragon Boat Festival, Mid-Autumn Festival");
	}
	public void policy(){
		if("han".equals(Nationality)){
			System.out.println("No preferential policies;");
		}else {
			System.out.println("Have preferential policies;");
		}
	}

	//请参考main函数的内容编写以上内容 
	public static void main(String args[]){ 
		Person a=new Person("zhangsan",19,"han"); 
		a.getName(); 
		a.getAge(); 
		a.getNationality(); 
		a.growUp(); 
		a.getAge(); 
		a.show(); 

		Person b=new Person("lisi",39,"man"); 
		b.getName(); 
		b.getAge(); 
		b.getNationality(); 
		b.growUp(); 
		b.getAge(); 
		b.show(); 

		Student c=new Student("wanger",33,"man","Postgraduate"); 
		c.growUp(); 
		c.custom(); 
		c.policy(); 
		c.show(); 

		Student d=new Student("wanger","Undergraduate"); 
		d.growUp(); 
		d.custom(); 
		d.policy(); 
		d.show(); 
		} 
	}

测试如图：