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;
	}
}