有很多麻烦的;非法开始表达

Question

我对计算机编程非常陌生-实际上是在6周前开始的课程-我目前在Netbeans中遇到了非法开始表达式的麻烦。

整个代码如下(因为我甚至不知道从哪里开始):

public class Employees {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        public class Employee
        //properties
        private String name;
        private String ID;
        private String salary;
        //constructor
        public Employee (String name, String address, String dob) {
            this.name = name;
            this.ID = ID;
            this.salary = salary;
        }
        //method to print details on employees
        public void printDetails() {
            System.out.println("Employee name: " +this.name);
            System.out.println("ID: "+ this.ID);
            System.out.println("Annual Salary: " + this.salary);
        }
    }
}

Answer 1

不能在方法声明(public static void main(String[] args) {)中声明类(public class Employee)。

最好将class Employee的声明移到它自己的文件(Employee.java)中。如果您不想将其移动到另一个文件，您也可以将其移动到现有文件的末尾。但是你必须声明它是private而不是public。

或者你可以像这样把所有的东西都做成一个类:

public class Employees {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Employees employee = new Employees("name", "address", "dob");
        employee.printDetails();
    }
    //properties
    private String name;
    private String ID;
    private String salary;
    //constructor
    public Employees (String name, String address, String dob) {
        this.name = name;
        this.ID = ID;
        this.salary = salary;
    }
    //method to print details on employees
    public void printDetails() {
        System.out.println("Employee name: " +this.name);
        System.out.println("ID: "+ this.ID);
        System.out.println("Annual Salary: " + this.salary);
    }
}