实现一个名为Person的类和它的两个子类Student和Employee。Employee有子类Faculty和Staff。Person中的人有姓名、地址和电话号码。 Student中的学生有班级状态（一、二、三、四年级）。将这些状态定义为常量。 Employee中的雇员有办公室、工资。Faculty中的教员有级别。Staff中的职员有职务称号。覆盖每个类中的toString方法，显示类名和人名。
public class Person {
private String name;
private String address;
private String number;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public String toString(){
return this.getClass()+"\nname::"+name+"\naddress::"+getAddress()+"\nnumber::"+getNumber();
}
}
package shiyanliu;
public class Student extends Person{
private final String GRADE_1 = "一年级";
private final String GRADE_2 = "二年级";
private final String GRADE_3 = "三年级";
private final String GRADE_4 = "四年级";
public String getGRADE_1() {
return GRADE_1;
}
public String getGRADE_2() {
return GRADE_2;
}
public String getGRADE_3() {
return GRADE_3;
}
public String getGRADE_4() {
return GRADE_4;
}
public String toString(){
return super.toString()+"\ngrade::"+getGRADE_2();
}
}
package shiyanliu;
public class Employee extends Person{
private String office;
private double pay;
public String getOffice() {
return office;
}
public void setOffice(String office) {
this.office = office;
}
public double getPay() {
return pay;
}
public void setPay(double pay) {
this.pay = pay;
}
public String toString(){
return super.toString()+"\noffice::"+getOffice()+"\npay::"+getPay()+"元";
}
}
package shiyanliu;
public class Faculty extends Employee{
private String title;
public String getTitle(){
return title;
}
public void setTitle(String title){
this.title = title;
}
public String toString(){
return super.toString()+"\ntitle::"+getTitle();
}
}
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