封装学生关联demo01

package com.com.FZAL;

public class test {
    public static void main(String[] args) {
        //new对象
        Studentf s0 = new Studentf("松松","173","男",23);
        ZY t0 = new ZY("机械工程","001",4);


        //设置学生所学专业
        s0.setZnames(t0);
        //修改学生所学专业
        ZY t1 = new ZY("材料","002",24);
        s0.setZnames(t1);
        //自我介绍
        String s = s0.introduce();
        System.out.println(s);
        System.out.println(s0.getZnames().getZid());

    }
}

package com.com.FZAL;

public class Studentf {
   private String sname;
   private String sid;
   private String sex;
   private int age;
   private ZY znames;

    public ZY getZnames() {
        return znames;
    }

    public void setZnames(ZY znames) {
        this.znames = znames;
    }

    public Studentf() {
    }

    public Studentf(String sname, String sid, String sex, int age) {
        this.sname = sname;
        this.sid = sid;
        this.sex = sex;
        this.age = age;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getSid() {
        return sid;
    }

    public void setSid(String sid) {
        this.sid = sid;
    }

    public String getSex() {
        return sex;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if (age < 0 || age > 100){
            System.out.println("sb");
            return;
        }
        this.age = age;
    }
    //没有设置专业 指针异常解决
    public String introduce(){
        ZY sub = this.znames;
        String s = "学生的信息如下：" + "姓名" + this.getSname() +
                "\n年龄" + this.getAge() +
                "\n学号" + this.getSid() +
                "\n性别" + this.getSex() +
                "\n专业名字" + (sub==null?"null":sub.getZname()) +
                "\n专业编号" + (sub==null?"null":sub.getZid())  +
                "\n专业年限" + (sub==null?"null":sub.getZage())
                ;
        return s;
    }
}

package com.com.FZAL;

public class ZY {
    private String zname;
    private String zid;
    private int zage;

    public ZY() {
    }

    public ZY(String zname, String zid, int zage) {
        this.zname = zname;
        this.zid = zid;
        this.zage = zage;
    }

    public String getZname() {
        return zname;
    }

    public void setZname(String zname) {
        this.zname = zname;
    }

    public String getZid() {
        return zid;
    }

    public void setZid(String zid) {
        this.zid = zid;
    }

    public int getZage() {
        return zage;
    }

    public void setZage(int zage) {
        this.zage = zage;
    }
    public String introduceZ(){
        String t = "专业信息如下" + "专业名称" + this.getZname()+
                "\n编号" + this.getZid() +
                "\n年限" + this.getZage();
        return  t;
    }
}

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