首次在JAVA中使用方法和构造函数，在程序中接收错误以确定加薪_Java_Methods_Constructor_Setter_Getter

首次在JAVA中使用方法和构造函数，在程序中接收错误以确定加薪

java methods

首次在JAVA中使用方法和构造函数，在程序中接收错误以确定加薪,java,methods,constructor,setter,getter,Java,Methods,Constructor,Setter,Getter,我正在编写一个相当简单的程序，只需输出两名员工的姓名、工资以及工资的10%。我有两个问题：1）工资打印为“$0.000000”2）我无法使加薪方法正常工作这是我的密码： public class Employee { // instance variable private String name; private String lastName; private double salary; // setters public St

我正在编写一个相当简单的程序，只需输出两名员工的姓名、工资以及工资的10%。我有两个问题：1）工资打印为“$0.000000”2）我无法使加薪方法正常工作

这是我的密码：

public class Employee {

    // instance variable
    private String name;
    private  String lastName;
    private  double salary;

    // setters
    public  String getLastName() { return lastName; }
    public  String getName() { return name; }
    public  double getSalary() { return salary; }

    public  void raise(double raise) { salary = salary + (salary * .1); }

    // getters
    public  Employee(String name, String lastName, double salary) {
        this.name = name;
        this.lastName = lastName;

        if (salary > 0.0) {
          this.salary = salary;
        }
    }
} 

public class EmployeeTest {

    public  static void main(String[] args) {

        Employee raise1 = new Employee("Betty", "Jones", 4000.0);
        Employee raise2 = new Employee("Sally", "Mae", 6000.0);

        // Print statements for the employee's name and salary
        System.out.printf("Employee #1\nFirst Name: %s\nLast Name: %s\n\n" + "Salary: $%f", raise1.getName(), raise1.getLastName(), raise1.getSalary());

        // THIS IS WHERE I'M HAVNG TROUBLE
        System.out.printf("Her raise will be: %d", raise1.raise(salary));

        System.out.printf("Employee #1\nFirst Name: %s\nLast Name: %s\n\n" + "Salary: %f", raise1.getName(), raise1.getLastName(), raise1.getSalary());

        raise2.raise(salary);
    }
}

提前感谢您的帮助

您的

raise（）

方法的返回类型为void，这意味着它根本不会返回任何内容。将返回类型更改为双倍，只需键入

返回此项。最后的工资

应该可以。应该是这样的：

public double raise(double salary)
{
    this.salary = salary + (salary * 0.1); 
    return this.salary;
}

this

关键字引用您正在使用的对象的实例。简单地说，您可能希望引用class

salary

变量，而不是方法中传递的参数，否则它将引用传入的参数

你还需要调用

this.salary=salary

在构造函数中，因为以前分配它的唯一方法是

salary

低于零，但4000不低于零

当你这样做的时候

Employee raise1= new Employee("Betty","Jones",4000.0);

调用具有以下条件的

Employee

类的构造函数：

 if (salary <0.0){
     this.salary = salary;
 }

if（salarysalary打印$0.00000的原因是因为您出于某种原因放置了if语句，而不是仅仅设置传递给构造函数的salary。第二件事，void方法不会返回任何东西，这就是raise方法无法按您希望的方式工作的原因。我为您修复了它，所以请看一看，希望我能帮助您理解其中的原因你做错了，如果你有任何问题，尽管问我，我在这里等你
员工考试类别：
public class EmployeeTest {

    public static void main(String[] args) {

        Employee raise1= new Employee("Betty","Jones",4000.0);
        Employee raise2= new Employee("Sally","Mae",6000.0);

        //Print statements for the employee's name and salary
        System.out.printf("Employee #1\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise1.getName(),
                raise1.getLastName(),
                raise1.getSalary());

        System.out.printf("\nHer raise will be: $%.2f",
                raise1.raise(raise1.getSalary()));


        System.out.printf("\n\nEmployee #2\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise2.getName(),
                raise2.getLastName(),
                raise2.getSalary());

        System.out.printf("\nHer raise will be: $%.2f\n",
                raise2.raise(raise2.getSalary()));

    }
}

public class Employee {

   //instance variable
   private String name;
   private String lastName;
   private double salary;

    //getters
    public String getLastName() {
        return lastName;
    }
    public String getName() {
        return name;
    }
    public double getSalary() {
        return salary;
    }

    public double raise(double raise){
        salary = salary + (salary*.1);
        return salary;
    }

    //constructor
    public Employee(String name, String lastName, double salary){

        this.name = name;
        this.lastName = lastName;
        this.salary = salary;

    }

}

员工类别：
public class EmployeeTest {

    public static void main(String[] args) {

        Employee raise1= new Employee("Betty","Jones",4000.0);
        Employee raise2= new Employee("Sally","Mae",6000.0);

        //Print statements for the employee's name and salary
        System.out.printf("Employee #1\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise1.getName(),
                raise1.getLastName(),
                raise1.getSalary());

        System.out.printf("\nHer raise will be: $%.2f",
                raise1.raise(raise1.getSalary()));


        System.out.printf("\n\nEmployee #2\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise2.getName(),
                raise2.getLastName(),
                raise2.getSalary());

        System.out.printf("\nHer raise will be: $%.2f\n",
                raise2.raise(raise2.getSalary()));

    }
}

public class Employee {

   //instance variable
   private String name;
   private String lastName;
   private double salary;

    //getters
    public String getLastName() {
        return lastName;
    }
    public String getName() {
        return name;
    }
    public double getSalary() {
        return salary;
    }

    public double raise(double raise){
        salary = salary + (salary*.1);
        return salary;
    }

    //constructor
    public Employee(String name, String lastName, double salary){

        this.name = name;
        this.lastName = lastName;
        this.salary = salary;

    }

}

打印上述程序的输出：
public class EmployeeTest {

    public static void main(String[] args) {

        Employee raise1= new Employee("Betty","Jones",4000.0);
        Employee raise2= new Employee("Sally","Mae",6000.0);

        //Print statements for the employee's name and salary
        System.out.printf("Employee #1\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise1.getName(),
                raise1.getLastName(),
                raise1.getSalary());

        System.out.printf("\nHer raise will be: $%.2f",
                raise1.raise(raise1.getSalary()));


        System.out.printf("\n\nEmployee #2\nFirst Name: %s\nLast Name: %s\n\n" +
                "Salary: $%.2f",
                raise2.getName(),
                raise2.getLastName(),
                raise2.getSalary());

        System.out.printf("\nHer raise will be: $%.2f\n",
                raise2.raise(raise2.getSalary()));

    }
}

public class Employee {

   //instance variable
   private String name;
   private String lastName;
   private double salary;

    //getters
    public String getLastName() {
        return lastName;
    }
    public String getName() {
        return name;
    }
    public double getSalary() {
        return salary;
    }

    public double raise(double raise){
        salary = salary + (salary*.1);
        return salary;
    }

    //constructor
    public Employee(String name, String lastName, double salary){

        this.name = name;
        this.lastName = lastName;
        this.salary = salary;

    }

}

员工#1
名字：贝蒂
姓：琼斯
薪金：4000美元
她的加薪是：4400美元
员工#2
名字：莎莉
姓：梅
薪金：6000美元
她的加薪将是：$6600.00
你的“getter”和“setters”评论有点……误导性。你的raise
方法是void
类型，这意味着它不会向你的系统.out.printf
行返回任何内容。如果（工资1.如PM77-1所述，您编写了代码以防止工资被初始化。2.什么是“正确的”你的raise
方法应该如何工作？我只是在解释我正在使用的书中的问题时有错误的逻辑。它说如果工资低于0，就不要传递它。我还想知道我如何修正关于加薪的打印声明。我编辑了上面的代码以显示我的更改，这就是我刚刚编辑它的原因。我意识到这个错误或者。仍然无法解决问题。零的110%仍然是零。该方法很好。不是在上下文中使用它。他在printf
语句中使用它，这要求返回类型不是void，而是void，以便它实际显示某个内容。System.out.printf（“她的加薪将是：%d”，raise1.raise（salary））
查看他的main（）方法。非常感谢。这是我第一次用Java编写代码，我还不熟悉语法。