UdaCity学习Java记录（1）继承

January 19, 2022

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2331 words

##Person 类
```java
public class Person {
    private String firstName;
    private String lastName;

public Person(String firstName, String lastName) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
    }

public String getFirstName() {
        return firstName;
    }

public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

public String getLastName() {
        return lastName;
    }

public void setLastName(String lastName) {
        this.lastName = lastName;
    }

@Override
    public String toString() {
        return "Name: " + lastName +" "+ firstName;
    }
}
```
##学生类，继承至Person
```Java
public class Student extends Person {
    private String studentId;

public Student(String firstName, String lastName, String studentId) {
        super(firstName, lastName);
        this.studentId = studentId;
    }

public String getStudentId() {
        return studentId;
    }

public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

@Override
    public String toString() {
        return super.toString() + "  StudentId: " + studentId;
    }
}
```
##学工类，继承至学生类
```Java
public class StudentEmployee extends Student {
    private double rateOfPayPerHour;
    private String employeeId;

public StudentEmployee(String firstName, String lastName, String studentId, double rateOfPayPerHour, String employeeId) {
        super(firstName, lastName, studentId);
        this.rateOfPayPerHour = rateOfPayPerHour;
        this.employeeId = employeeId;
    }

@Override
    public String toString() {
        return super.toString() + "  Employee ID: " + employeeId + "  Pay: " + rateOfPayPerHour;
    }
}
```
##测试类
用于测试各类的具体对象通过继承之后所具有的特殊状态
```Java
public class PersonTester {

public static void main(String[] args) {
        Person wangZuXian = new Person("ZuXian", "Wang");
        System.out.println(wangZuXian.toString());
        Student zhangSan =new Student("San","Zhang","KT0707007");
        System.out.println(zhangSan.toString());
        StudentEmployee liSi=new StudentEmployee("Si","Li","KT7854123",2.5,"ET0202001");
        System.out.println(liSi.toString());
    }
}
```

UdaCity学习Java记录（1）继承