import java.awt.*;import java.util.Scanner;/** * Created by s2002 on 2016/9/30. */public class com {    public static void main(String[] args) {        //限制字符串最大值        final int MAX_LEN = 100;        //关键字        String[] key_word = new String[]{"begin","end","if","then","while","do"};        //录入用户输入        Scanner input = new Scanner(System.in);        System.out.print("Please input a string <end with ‘#‘>:");        String uString = input.nextLine();        char[] analyseData = http://www.mamicode.com/new char[MAX_LEN];"< " + key + " ," + words + " >");        } while (key != 0);    }    public static List extactCharacters(char temp, char[] analyseDate, String[] keywords, String uString, int index,                                        String compareStr) {        int keyID = -1, m = 0;        List list = new List();        //判断下一个读入的字符是否为空格，若读取到空格则跳过，提取下一个字符进行判断        while (temp != ‘ ‘) {            //判断当前字符是字母或者数字和字母的组合            if (temp >= ‘a‘ && temp <= ‘z‘) {                m = 0;                // 当读取到不是大小写字母或者数字时候判断为一个单词读取完成                while (temp >= ‘a‘ && temp <= ‘z‘ || temp >= ‘A‘ && temp <= ‘Z‘ || temp >= ‘0‘ && temp <= ‘9‘) {                    analyseDate[m++] = temp;                    compareStr += temp + "";                    temp = uString.charAt(++index);                }                // 与读取出来的字符判断是否为关键字                compareStr = compareStr.substring(4);                for (int i = 0; i < 6; i++) {                    if (compareStr.equals(keywords[i])) {                        keyID = i + 1;                        list.add(index + "");                        list.add(keyID + "");                        list.add(compareStr);                        return list;                    }                }                //若为非关键字就当作为标识符                keyID = 10;                list.add(index + "");                list.add(keyID + "");                list.add(compareStr);                return list;            }            //判断当前字符是否为数字            else if (temp >= ‘0‘ && temp <= ‘9‘) {                m = 0;                String tempTokens = null;                // 对后面的字符进行判断是否为数字                while (temp >= ‘0‘ && temp <= ‘9‘) {                    analyseDate[m++] = temp;                    tempTokens += temp;                    temp = uString.charAt(++index);                }                // 不是数字则返回种别码，结束当前方法                keyID = 11;                tempTokens = tempTokens.substring(4);                list.add(index + "");                list.add(keyID + "");                list.add(tempTokens + "");                return list;            }            m = 0;            //判断当前字符是否为其他关系运算符            String token = null;            switch (temp) {                case ‘<‘:                    // String token = null;                    analyseDate[m++] = temp;                    token += temp;                    if (uString.charAt(++index) == ‘=‘) {                        analyseDate[m++] = temp;                        keyID = 22;                        token += uString.charAt(index++);                    } else if (uString.charAt(++index) == ‘>‘) {                        analyseDate[m++] = temp;                        keyID = 21;                        token += uString.charAt(index++);                    } else {                        keyID = 23;                    }                    list.add(index + "");                    list.add(keyID + "");                    token = token.substring(4);                    list.add(token);                    return list;                case ‘>‘:                    analyseDate[m++] = temp;                    token += temp;                    if (uString.charAt(++index) == ‘=‘) {                        keyID = 24;                        analyseDate[m++] = temp;                        token += uString.charAt(index++);                    } else {                        keyID = 20;                    }                    list.add(index + "");                    list.add(keyID + "");                    token = token.substring(4);                    list.add(token);                    return list;                case ‘:‘:                    analyseDate[m++] = temp;                    token += temp;                    if (uString.charAt(++index) == ‘=‘) {                        keyID = 18;                        // analyseDate[m++] = temp;                        analyseDate[m++] = uString.charAt(index);                        token += uString.charAt(index++);                    } else {                        keyID = 17;                    }                    list.add(index + "");                    list.add(keyID + "");                    token = token.substring(4);                    list.add(token);                    return list;                case ‘*‘:                    keyID = 13;                    break;                case ‘/‘:                    keyID = 14;                    break;                case ‘+‘:                    keyID = 15;                    break;                case ‘-‘:                    keyID = 16;                    break;                case ‘=‘:                    keyID = 25;                    break;                case ‘;‘:                    keyID = 26;                    break;                case ‘(‘:                    keyID = 27;                    break;                case ‘)‘:                    keyID = 28;                    break;                case ‘#‘:                    keyID = 0;                    break;                default:                    keyID = -1;                    break;            }            analyseDate[m++] = temp;            list.add(++index + "");            list.add(keyID + "");            list.add(temp + "");            return list;        }        return list;    }}