java - 标识符预期问题

Question

我似乎找不到这里的错误。显然，所有常量的“final”后面都应该有一个标识符。有人可以帮忙吗？

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Letter
{
    private static final int 30G_PRICE = 40; 
    private static final int 50G_PRICE = 55;  
    private static final int 100G_PRICE = 70; 
    private static final int ADDITIONAL_50G_PRICE = 25;
    public static void main (String[] args) throws IOException
    {
    BufferedReader console = 
        new BufferedReader(new InputStreamReader(System.in));
    }   
}

Answer 1

变量(或任何其他标识符)名称不能以数字开头。

From the tutorials

Variable names are case-sensitive. A variable's name can be any legal identifier — an unlimited-length sequence of Unicode letters and digits, beginning with a letter, the dollar sign "$", or the underscore character "_".