Java 类“无法解析为类型" [英] Java class "cannot be resolved to a type"

问题描述

这是我得到的错误:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:  
    TeamLeader cannot be resolved to a type

    at TeamLeadDemo.main(TeamLeadDemo.java:26)

这是我的代码:

import java.util.Scanner;

public class Employee {
    public String empName, empNumber, hireDate;    

    public class TeamLeadDemo {}

    public Employee(String empName, String empNumber, String hireDate) {
        this.setEmpName(empName);
        this.setEmpNumber(empNumber);
        this.setHireDate(hireDate);
    }

    public void setEmpName(String empName) {
         this.empName = empName;
    }
        public void setEmpNumber(String empNumber) {
         this.empNumber = empNumber;
    }
    public void setHireDate(String hireDate) {
         this.hireDate = hireDate;
    }
    public String getEmpName() {
        return empName;
    }
    public String getEmpNumber() {
        return empNumber;
    }
    public String getHireDate() {
        return hireDate;
    }

    public class ShiftSupervisor extends Employee {
        public double annualSalary, annualProduction;
        //constructor
        public ShiftSupervisor(String empName, String empNumber,
                               String hireDate, double annualSalary,
                               double annualProduction) {
            super(empName,empNumber, hireDate);
            this.setAnnualSalary(annualSalary);
            this.setAnnualProduction(annualProduction);
        }

        public double getAnnualSalary() {
            return annualSalary;
        }
        public double getAnnualProduction() {
            return annualProduction;
        }
        public void setAnnualSalary(double annualSalary) {
            this.annualSalary = annualSalary;
        }
        public void setAnnualProduction(double annualProduction) {
            this.annualProduction = annualProduction;
        }

        public String toString() {
            return "Name: "+ getEmpName() + "
EmpID: "+ getEmpNumber()
                   + "
Hire Date: "+ getHireDate() + "
Annual Salary: "
                   + annualSalary + "
Production: "+ annualProduction;
        }

        public class employeeStart {
            public void main(String[] args) {
                String name, id, date;
                double sal, prod;

                //create scanner object
                Scanner keyboard = new Scanner(System.in);

                //inputting data
                System.out.println("Enter Name: ");
                name = keyboard.nextLine();
                System.out.println("Enter id: ");
                id = keyboard.nextLine();
                System.out.println("Enter Hire Date: ");
                date = keyboard.nextLine();
                System.out.println("Enter Annual: ");
                sal = keyboard.nextDouble();
                System.out.println("Enter production: ");
                prod = keyboard.nextDouble();

                //instantiating object
                ShiftSupervisor pw = new ShiftSupervisor(name, id, date, sal, prod);

                //outputting data
                System.out.println("Employee Details: 
" + pw);
            }
        }
        public class TeamLeader {
            public double monthlyBonus;
            public int minTraining, trainingPresent;    

            public TeamLeader(double monthlyBonus, int minTraining, int trainingPresent) {
                this.setMonthlyBonus(monthlyBonus);
                this.setMinTraining(minTraining);
                this.addtrainingPresent(trainingPresent);                    
            }

            public void setMonthlyBonus(double monthlyBonus) {
                this.monthlyBonus = monthlyBonus;
            }
            public void setMinTraining(int minTraining) {
                this.minTraining = minTraining;
            }
            public void setTrainingPresent(int t) {
                trainingPresent = t;
            }
            public void addtrainingPresent(int hours) {
                trainingPresent += hours;
            }
            public double getMonthlyBonus() {
                return monthlyBonus;
            }
            public int getMinTraining() {
                return minTraining;
            }
            public int getTrainingPresent() {
                return trainingPresent;
            }
            public String toString() {
                return "Bonus: "+ getMonthlyBonus() + "
Minimum Training: "
                + getMinTraining() + "
Attendence: "+ getTrainingPresent();
            }
        }
    }
}

另外，我在一个单独的类中声明了这一点:

In addition, I declared this in a separate class:

import java.util.Scanner;

public class TeamLeadDemo extends Employee {
    public TeamLeadDemo(String empName, String empNumber, String hireDate) {
        super(empName, empNumber, hireDate);
        // TODO Auto-generated constructor stub
    }

public static void main(String[] args) {
    double sal;
    int min, atten;

    //create scanner object
    Scanner keyboard = new Scanner(System.in);

    //inputting data
    System.out.println("Enter minimum training: ");
    min = keyboard.nextInt();
    System.out.println("Enter id: ");
    atten = keyboard.nextInt();
    System.out.println("Enter Bonus: ");
    sal = keyboard.nextDouble();

    //instantiating object
    ShiftSupervisor pw = new TeamLeader(sal, min, atten);

    //outputting data
    System.out.println("Employee Details:
" + pw);

    }
}

是什么导致了这个错误，我该如何解决?

What is causing this error and how might I resolve it?

缩进、空格、命名约定和可读性问题已在一定程度上得到解决.

Indentation, whitespace, naming conventions and readability issues have been somewhat addressed.

推荐答案

问题在于 TeamLeader 似乎是一个内部类(很难说，你的缩进不好)，而且由于它不是静态的，你不能自己实例化它.

The problem is that TeamLeader appears to be an inner class (hard to tell, your indentation is bad), and since it's not static, you can't instantiate it by itself.

你要么需要让 TeamLeader 成为它自己的类，或者让它成为一个 static 类并将其实例化为 Employee.TeamLeader(或其他任何父类是，你的缩进在这里真的没有帮助).

You either need to make TeamLeader its own class, or make it a static class and instantiate it as Employee.TeamLeader (or whatever the parent class is, your indentation is really not helpful here).

这篇关于Java 类“无法解析为类型"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！