定义枚举的构造函数、方法和字段

import org.junit.Test;  
  
public class lan {  
    @Test  
    public void test(){  
        print(Grade.D);  
    }  
  
    public void print(Grade g) {  
        String valueString = g.getValue();  
        System.out.println(valueString);  
    }  
}  
  
enum Grade{  
    A("100-90"),B("89-80"),C("79-70"),D("69-60"),E("59-0");  
  
    private String value;  
    private Grade(String value){  
        this.value = value;  
    }  
      
    public String getValue(){  
        return this.value;  
    }  
}