package com.unit2.test; public class Test4 { public static void main(String[] args) { Salary s=new Salary("员工A","北京",3,3600.00); Employee e=new Salary("员工B","上海",2,2400.00); System.out.println("使用Salary的引用调用mailcheck--"); s.mailCheck(); System.out.println("\n使用employee的引用调用mailcheck--"); e.mailCheck(); } public class Employee{ private String name; private String address; private int number; private double salary; public Employee(String name,String address,int number) { System.out.println("Employee 构造函数"); this.name=name; this.address=address; this.number=number; } public void mailCheck() { System.out.println("邮寄支票给："+this.name+" "+this.address); } public String toString() { return name+" "+address+" "+number; } public String getName() { return name; } public String getAddress() { return address; } public void setAddress(String newAddress) { address=newAddress; } public int getNumber() { return number; } public double getSalary() { return salary; } public void setSalary(double newSalary) { if(newSalary>=0.0) { salary=newSalary; } } } public class Salary extends Employee { private double salary;//全年工资 public Salary(String name,String address,int number,double salary) { super(name,address,number); setSalary(salary); } public void mailCheck() { System.out.println("Salary类的mailcheck方法"); System.out.println("邮寄支票给："+getName()+",工资为"+salary); } public double getSalary() { return salary; } public void setSalary(double newSalary) { if(newSalary>=0.0) { salary=newSalary; } } public double computePay() { System.out.println("计算工资，付给："+getName()); return salary/52; } } }更正以上代码错误

在以上代码中，需要做出如下更正：

1. 将Test4类中的两个内部类Employee和Salary移出Test4类，并分别保存为Employee.java和Salary.java文件。

2. 修改Employee和Salary的构造函数，使得它们的第三个参数number改为protected类型，以便在Salary类中访问。

3. 在Test4类中，将Employee e=new Salary("员工B","上海",2,2400.00); 改为Employee e=new Employee("员工B","上海",2); 以避免类型不匹配错误。

下面是更正后的代码：

Employee.java

package com.unit2.test;

public class Employee {
    private String name;
    private String address;
    protected int number;
    
    public Employee(String name,String address,int number) {
        System.out.println("Employee 构造函数");
        this.name=name;
        this.address=address;
        this.number=number;
    }
    
    public void mailCheck() {
        System.out.println("邮寄支票给："+this.name+" "+this.address);
    }
    
    public String toString() {
        return name+" "+address+" "+number;
    }
    
    public String getName() {
        return name;
    }
    
    public String getAddress() {
        return address;
    }
    
    public void setAddress(String newAddress) {
        address=newAddress;
    }
    
    public int getNumber() {
        return number;
    }
}

Salary.java

package com.unit2.test;

public class Salary extends Employee {
    private double salary;//全年工资
    
    public Salary(String name,String address,int number,double salary) {
        super(name,address,number);
        setSalary(salary);
    }
    
    public void mailCheck() {
        System.out.println("Salary类的mailcheck方法");
        System.out.println("邮寄支票给："+getName()+",工资为"+salary);
    }
    
    public double getSalary() {
        return salary;
    }
    
    public void setSalary(double newSalary) {
        if(newSalary>=0.0) {
            salary=newSalary;
        }
    }
    
    public double computePay() {
        System.out.println("计算工资，付给："+getName());
        return salary/52;
    }
}

Test4.java

package com.unit2.test;

public class Test4 {
    public static void main(String[] args) {
        Salary s=new Salary("员工A","北京",3,3600.00);
        Employee e=new Employee("员工B","上海",2);
        
        System.out.println("使用Salary的引用调用mailcheck--");
        s.mailCheck();
        
        System.out.println("\n使用employee的引用调用mailcheck--");
        e.mailCheck();
    }
}