Java编写的编译器前端

				package lexer;		// File Word.java				public class Word extends Token {					public String lexeme = "";					public Word(String s, int tag) { super(tag); lexeme = s; }					public String toString() { return lexeme; }					public static final Word						and = new Word( "&&", Tag.AND ), or = new Word( "||", Tag.OR ),						eq  = new Word( "==", Tag.EQ  ), ne = new Word( "!=", Tag.NE ),						le  = new Word( "=", Tag.GE ),						minus = new Word( "minus", Tag.MINUS ),						True  = new Word( "true",  Tag.TRUE  ),						False = new Word( "false", Tag.FALSE ),						temp  = new Word( "t",     Tag.TEMP  );				}