Question

eclipse中为何无法运行源文件呢，，java

代码一个不错，在run as 后面没有java application 选项，
按alt shift x,j提示editor does not contain a main type，下面是源代码，就是运行不了，而有些就可以
package day12;

import java.util.Calendar;
import java.util.Comparator;

public class Employee implements Comparable<Employee>{
public static final Employee.EmployeeSalaryASC SALARYASC=new Employee.EmployeeSalaryASC();
public static final Employee.EmployeeBirthdayASC BIRTHDAYASC=new Employee.EmployeeBirthdayASC();
private String name;

private boolean genader;

private Calendar birthday;

private double salary;

public Employee(String name, boolean genader, Calendar birthday,
double salary) {
super();
this.name = name;
this.genader = genader;
this.birthday = birthday;
this.salary = salary;
}

public Employee() {
super();
}

public Calendar getBirthday() {
return birthday;
}

public void setBirthday(Calendar birthday) {
this.birthday = birthday;
}

public boolean isGenader() {
return genader;
}

public void setGenader(boolean genader) {
this.genader = genader;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public double getSalary() {
return salary;
}

@Override
public boolean equals(Object obj) {
if(obj instanceof Employee){
Employee e=(Employee)obj;
if(this.name.equals(e.name) && getBirth(this.birthday).equals(getBirth(e.birthday))){
return true;
}
}
return false;
}

@Override
public int hashCode() {
return name.hashCode()^birthday.hashCode()^0x1a2b3c4d;
}

public void setSalary(double salary) {
this.salary = salary;
}

public static String getBirth(Calendar c){
int year=c.get(Calendar.YEAR);
int month=c.get(Calendar.MONTH);
int day=c.get(Calendar.DAY_OF_MONTH);
String birthday=year+"-"+month+"-"+day;
return birthday;
}

@Override
public String toString() {
return name+":"+getBirth(birthday)+":"+salary;
}

public int compareTo(Employee o) {
char thisfirst=this.name.charAt(0);
char ofirst=o.name.charAt(0);
if(thisfirst<ofirst){
return -1;
}else if(thisfirst>ofirst){
return 1;
}
return 0;
}

private static class EmployeeSalaryASC implements Comparator<Employee>{
public int compare(Employee e1, Employee e2) {
if(e1.salary<e2.salary){
return -1;
}else if(e1.salary>e2.salary){
return 1;
}
return 0;
}
}

private static class EmployeeBirthdayASC implements Comparator<Employee>{
public int compare(Employee e1, Employee e2) {
if(e1.birthday.getTime().getTime()<e2.birthday.getTime().getTime()){
return 1;
}else if(e1.birthday.getTime().getTime()>e2.birthday.getTime().getTime()){
return -1;
}
return 0;
}
}
}

Answer 1

哥哥。。。。没有主函数。。。。。

再写一个public static void main(String[] args){
//你的代码，诸如new 啊什么的。。
}

Answer 2

没有public static void main(String args[]) {
}方法

Answer 3

(⊙o⊙)哦God

Answer 4

没有main方法的原因

Answer 5

你没写
main
方法