请编写一个关于星期几的枚举WeekDay，要求： 枚举值：Mon,Tue,Wed,Thu,Fri,Sat,Sun 该枚举要有一个方法，调用该方法返回中文格式的星期。

package com.week.base;

public class Demo1 {

/**

* @param args

*/

public static void main(String[] args) {

Week s=new Week();

s.setName("今天");

s.setGrade(Grade.Mon);

String str=Grade.Mon.getValue();

String str1=Grade.Mon.toLocalGrade();

System.out.println(str+"...."+str1);

}

}

package com.week.base;

public class Week {

private String name;

private Grade grade;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Grade getGrade() {

return grade;

}

public void setGrade(Grade grade) {

this.grade = grade;

}

}

enum Grade{

Mon("Monday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期一";

}

},

Tue("Tuesday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期二";

}

},

Wed("Wednesday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期三";

}

},

Thu("Thursday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期四";

}

},

Fri("Friday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期五";

}

},

Sat("Saturday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期六";

}

},

Sun("Sunday") {

@Override

public String toLocalGrade() {

// TODO Auto-generated method stub

return "星期日";

}

}, ;

private String value;

private Grade(String value){

this.value=value;

}

public String getValue() {

return value;

}

public abstract String toLocalGrade();

}