遇到主要问题时，请告知

抱歉，我是Java新手，我的代码有问题。我通读了这些线程，并看到了许多有关此特定错误的示例(java.lang.NoSuchMethodError: main Exception in thread "main")。我似乎无法绕开将（static void main(String[] args)）添加到代码的位置。如果你们能指出正确的方向，我将非常感激。

这是我所拥有的：

public class Employee {


String name;
String department;

double hourlyRate;

Employee(String name, String department, double hourlyRate) {
    this.name = name;
    this.department = department;
    this.hourlyRate = hourlyRate;
}

public void setDepartment(String department) {
    this.department = department;
}

public void setHourlyRate(double hourlyRate) {
    this.hourlyRate = hourlyRate;
}

public String getNameAndDepartment() {
    return name + " " + department;
}

double weeklyPay(int numOfHourWorked) {
    if (numOfHourWorked < 40) {
        return (numOfHourWorked * hourlyRate);
    } else
        return (40 * hourlyRate);

}
}

class UnionEmployee extends Employee {

double dues;

UnionEmployee(String name, String department, double hourlyRate, double dues) {
    super(name, department, hourlyRate);
    this.dues = dues;
}

public void setDues(double dues) {
    this.dues = dues;
}

double weeklyPay(int numOfHourWorked) {
    if (numOfHourWorked <= 40) {
        return (super.weeklyPay(numOfHourWorked));
    } else
return ((super.weeklyPay(40) + ((numOfHourWorked - 40) * hourlyRate * 1.5)) - dues);
}
}

class CommissionEmployee extends Employee {

double commisionRate;
double salesAmount;

CommissionEmployee(String name, String department, double hourlyRate) {
    super(name, department, hourlyRate);
}

public void setCommisionRate(double commisionRate) {
    this.commisionRate = commisionRate;
}

public void setSalesAmount(double salesAmount) {
    this.salesAmount = salesAmount;
}

double weeklyPay(int numOfHourWorked) {
    return (super.weeklyPay(numOfHourWorked) + (commisionRate * salesAmount));
}

}

class TestEmployee {
UnionEmployee uEmp = new UnionEmployee(null, null, 0, 0);
CommissionEmployee cEmp = new CommissionEmployee(null, null, 0);
Employee emp = new Employee(null, null, 0);

void display(Employee emp, int numOfHourWorked) {
    System.out.println("Name and department :" + emp.getNameAndDepartment    ());
    System.out.println("Weekly pay of employee :"
            + emp.weeklyPay(numOfHourWorked));
}

void display(UnionEmployee uEmp, CommissionEmployee cEmp,
        int numOfHourWorked) {
    System.out.println("Weekly Pay for UnionEmployee"
            + uEmp.weeklyPay(numOfHourWorked));
    System.out.println("Weekly Pay for UnionEmployee"
            + cEmp.weeklyPay(numOfHourWorked));
}

}

好的，所以我首先将每个类分成一个不同的文件。在浏览Java教程时，它说要按照教程的设置方式添加静态void main（String [] args），如下所示：

public class Misc {
static void main(String[] args) {

//body
   }
}

所以我这样做：

class TestEmployee {

static void main(String[] args) {

UnionEmployee uEmp = new UnionEmployee(null, null, 0, 0);
CommissionEmployee cEmp = new CommissionEmployee(null, null, 0);
Employee emp = new Employee(null, null, 0);

void display(Employee emp, int numOfHourWorked) {
    System.out.println("Name and department :" + emp.getNameAndDepartment    ());
    System.out.println("Weekly pay of employee :"
            + emp.weeklyPay(numOfHourWorked));
}

void display(UnionEmployee uEmp, CommissionEmployee cEmp,
        int numOfHourWorked) {
    System.out.println("Weekly Pay for UnionEmployee"
            + uEmp.weeklyPay(numOfHourWorked));
    System.out.println("Weekly Pay for UnionEmployee"
            + cEmp.weeklyPay(numOfHourWorked));
}

}

}

仍然出现相同的错误：（java.lang.NoSuchMethodError：线程“ main”中的main异常）。

好的，我添加了public，但是现在我得到了：

线程“主”中的异常java.lang.Error：未解决的编译问题：

void is an invalid type for the variable display
Syntax error on token "(", ; expected
Duplicate local variable emp
Syntax error on token ",", ; expected
Syntax error on token ")", ; expected
void is an invalid type for the variable display
Syntax error on token "(", ; expected
Duplicate local variable uEmp
Syntax error on token ",", ; expected
Duplicate local variable cEmp
Syntax error on token ",", ; expected
Duplicate local variable numOfHourWorked
Syntax error on token ")", ; expected

at TestEmployee.main(TestEmployee.java:9)