stringtoken.java

java词法分析程序

package com.Compiler.token;

public class StringToken {
	private String str;
	private int len;
	private int pointer;

	public StringToken(String str) {
		this.str = str;
		this.len = this.str.length();
		this.pointer = 0;
	}

	public char getChar() {
		if (pointer < len) {
			return this.str.charAt(pointer);
		}
		return ' ';
	}

	public boolean hasChar() {
		if (pointer == len) {
			return false;
		} else {
			return true;
		}
	}

	public void addChar() {
		pointer++;
	}

	public void subChar() {
		pointer--;
	}

	public static void main(String[] args) {
		StringToken st = new StringToken("iamok");
		char r;
		while (st.hasChar()) {
			System.out.println(st.getChar());
		}
	}
}