java你能用方法创建一个类的对象吗?
我尝试使用一个方法创建一个类的对象,该方法使用Scanner方法接受用户输入。问题是,如果我试图将其创建到main中,它会给我一个错误,告诉我不能从静态上下文引用非静态方法。如果我尝试使该方法成为静态的,并尝试从main()使用它,它将要求向其传递参数。我能做什么
下面是该类的源代码,该方法名为createSalaried()
:
package com.company;
import java.util.ArrayList;
import java.util.Scanner;
public class SalariedEmployee extends Employee {
public ArrayList<SalariedPayslip> salaried_payslips = new ArrayList<>();
int annual_salary;
String work_mode;
String job_department;
public SalariedEmployee(
int id,
String title,
String first_name,
String last_name,
String date_birth,
String national_insurance,
String job_titles,
String job_department,
String work_mode,
int salary) {
this.employee_id = id;
this.employee_title = title;
this.first_name = first_name;
this.last_name = last_name;
this.date_of_birth = date_birth;
this.national_insurance = national_insurance;
this.job_titles = job_titles;
this.job_department = job_department;
this.work_mode = work_mode;
this.annual_salary = salary;
}
public int getSalary() {
return annual_salary;
}
public int getId() {
return employee_id;
}
// Returns a string with all the data of the specified employee.
public String toString() {
return String.format(
" Employee id: %d\n Title: %s\n First name: %s\n Last name: %s\n Date of birth: %s\n National Insurance: %s\n Job titles: %s\n Job department: %s\n Work mode: %s\n Annual salary: %d",
employee_id,
employee_title,
first_name,
last_name,
date_of_birth,
national_insurance,
job_titles,
job_department,
work_mode,
annual_salary);
}
public SalariedEmployee createSalaried(int id_assign) {
Scanner input_scanner = new Scanner(System.in);
System.out.println("Title:");
String employee_title = input_scanner.nextLine();
System.out.println("First name:");
String first_name = input_scanner.nextLine();
System.out.println("Last name");
String last_name = input_scanner.nextLine();
System.out.println("Date of birth:");
String date_of_birth = input_scanner.nextLine();
System.out.println("National insurance number");
String national_insurance = input_scanner.nextLine();
System.out.println("Job titles:");
String job_titles = input_scanner.nextLine();
System.out.println("Job department:");
String job_department = input_scanner.nextLine();
System.out.println("Full-time or part-time?:");
String work_mode = input_scanner.nextLine();
System.out.println("Salary:");
int salary = input_scanner.nextInt();
return new SalariedEmployee(
id_assign,
employee_title,
first_name,
last_name,
date_of_birth,
national_insurance,
job_titles,
job_department,
work_mode,
salary);
}
}
# 1 楼答案
createSalaried看起来应该是工厂方法,所以将其设置为静态
然后像这样使用:
# 2 楼答案
如果你不想通过一个实例来使用这个方法,你应该像这样使你的方法是静态的
这样你就可以很容易地使用它了