toString及equals方法.docx

1. 重写前面定义的“Person”类和“Student”类的toString及equals方法，并编程测试。程序如下：class Person int i; Person()Person(int i)this.i=i;public String toString() return 我叫Mary; public boolean equals(Object obj) Person p1=(Person) obj;if(this.i=p1.i)return true;elsereturn false; class Student extends Person int x,y;Student(int x,int y )this.x=x;this.y=y; public String toString() return 我是计算机系计科09级学生;public boolean equals(Object obj) Student s1=(Student) obj;if(this.i=s1.i)return true;elsereturn false; public class TestPerson public static void main(String args) Person p1=new Person(2); Person p2=new Person(2); Student s1=new Student(3,4); Student s2=new Student(3,4); System.out.println(p1.equals(p2); System.out.println(s1.equals(s2); System.out.println(p1); System.out.println(s1); 运行结果：2根据上面的程序，构造“Teacher”类，继承“Person”类，要求：（1）增加“职称（String）”属性；（2）具有和“Student”类类似的构造重载方法；（3）重写“Person”类的info()方法，增加“职称”信息。程序如下：class Person String name; long id; int age; Person() Person(String name ,long id,int age) =name; this.id=id;this.age=age; void info() System.out.println(我的信息是：+姓名=+name+; +证件号=+id+; +年龄=+age); class Teacher extends PersonString name; long id; int age; String profession;Teacher(String _name,long _id,int _age,String profession) name=_name; id=_id; age=_age; fession=profession;void info() System.out.println(我的信息是：+姓名=+name+; +证件号=+id+; +年龄=+age+; +职称=+profession); public class TestPerson2public static void main(String args)Person p1=new Person(张