函数的重载 Equals用法

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public class Person {
public String name;
protected int age;
public String sex;
public int Id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
if(age>30){
System.out.println(“太小”);
}
return this.age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public void sleep(){
System.out.println(“在家睡觉”);
}
public void eat(){
System.out.println(“在家吃饭”);
}
public String getId() {
return name;
}
public void setId(String name) {
this.name = name;
}

public class Student extends Person {
public static String address;
public static Dog wangCai=new Dog();
public Student() {
System.out.println(“这是子类的构造器”);
System.out.println(“子类的属性age” + age);
}
// super();//只能在子类的构造器中调用并写在第一行
// super.属性名
// super.方法名()
// 构造器先构造父类再弄子类
public int getAge() {
return super.getAge();
}
public static void nightwork(){
System.out.println(“上晚自习”);

}public  void study(){    System.out.println("学习");}@Overridepublic boolean equals(Object obj) {    if(obj!=null){        if (obj instanceof Student){            boolean isTheSameId=((Student)obj).Id==this.Id;            return isTheSameId;        }    }    return false;}public static void main(String[] args) {    Student lisi = new Student();// 子类构造器    lisi.setId("123");    lisi.setName("李四");    Student zhangsan=new Student();    zhangsan.setId("123");    zhangsan.setName("张三");    System.out.println(zhangsan.equals(lisi));

// lisi.getAge();
// Student.address = “青岛”;
// System.out.println(Student.address);
// Student.nightwork();
// Student.wangCai.voice();
}

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