建立一个普通人员类person，包含name，gender，age，成员变量。

（1）建立person类，包含private成员，name，sex，age，成员变量。
（2）建立person得构造函数
（3）建立一个显示过程show（），显示该对象的数据。
（4）派生一个学生类student，增加班级class，major，设计这些类得构造函数。
（5）建立class，major，对应的属性函数Sclass（），SMajor（）。
（6）建立显示成员函数Show（），显示该学生对象说有成员数据。

class People {
private static final String Number = null;
//属性
String name;
String sex;
int age;
static long ID=120113000000000000L;
String address;
int peopleNumber;
static int COUNT=0;
//构造方法重载

            People(){
                this("Tom","nan",20,ID,"天津市滨海新区");
                ID=120113000000000000L;
                COUNT++;
            }
            People(long ID){
                this("Tom","nan",20,ID,"天津市滨海新区");
                COUNT++;
            }
            People(String name ,String sex ,int age , long ID, String address){
                this.name=name;
                this.sex =sex;
                this.age =age;
                People.ID = ID;
                this.address =address;
                COUNT++;
            }

            static void informations(int age,String address,long ID){
                age=0;

            }


            void setSex(String sex){    
                this.sex=sex;
            }
            String getSex(){
                return sex;
            }

            void setAge(int age){
                if(age>=0 && age<=150){
                    this.age=age;
                }
                else{
                    System.out.println("数据不合理！");
                }

            }
            int getAge(){
                return this.age;
            }

            void setID(long ID){
                if(Long.toString(ID).length()==18){
                    People.ID=ID;
                }
                else{
                    System.out.println("Number is long!");
                }

            }
            long getID(){
                return People.ID;
            }

            void setAddress(String newaddress){
                address=newaddress;
            }
            String getAddress(){
                return address;
            }

            public String information(){
                return "name="+ this.name+",sex=" + this.sex +",address="+this.address+",ID="+People.ID+",age:"+this.age;

            }


            public void family(People []f){
                for(int i=0; i<f.length;i++){
                    System.out.println(f[i].information());
                }
            }
}
import java.util.Scanner;

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

    People stu =new People();
    People stu2 = new People(102156789456325482L);
    People stu3 = new People();
    People stu4= new People("Tom","nan",20,1201332054698520142L,"天津市滨海新区");
    stu.name="王明旭";
    //stu.setAge(23);
    stu.setID(102156789456325482L);
    stu.setAddress("天津市滨海新区");
    stu.setSex("女");
    System.out.println(stu.name+"\tage:"+stu.getAge()+"\taddress:"+stu.getAddress()+"\t"+stu.getSex()+"\tnumber:"+stu.getID());
    //stu.information();
    stu2.setAge(-10);
    stu2.name ="wangmingxu";
    System.out.print("age:"+stu2.getAge()+"\t"+stu2.name+"\n");
    //stu2.setID(123460);
    //System.out.println(stu2.getID());
    People[] stu4_family=new People[2];//数组
    System.out.println("stu4_family:");
    stu4_family[0]=stu3;
    stu4_family[1]=new People("Mary","男",12,1201332054698520142L,"天津市滨海新区");
    stu4.family(stu4_family);