JAVA實現EXCEL公式專題（四）——字串函數

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直接上代碼：

/** *  項目名稱： *  檔案說明： ExCEL公式類型：字串公式 *  主要特點： *  版本：1.0 *  製作人：劉晨曦 *  建立時間：2013-12-3 **/package EXCEL;/** * @author lcx * */public class StringFunctions {public static String right(String str,int len){if(len>str.length())throw new IllegalArgumentException("截取長度不能大於數組長度");return str.substring(str.length()-len, str.length());}public static String left(String str,int len){if(len>str.length())throw new IllegalArgumentException("截取長度不能大於數組長度");return str.substring(0, len);}public static String mid(String str,int start,int len){if(start+len-1>str.length())throw new IllegalArgumentException("截取越限");return str.substring(start-1, start+len-1);}public static int len(String str){if(str==null)return 0;return str.length();}public static String concatenate(String...strs){StringBuffer buffer=new StringBuffer();for(String str:strs)buffer.append(str);return buffer.toString();}public static boolean exact(String str1,String str2){return str1.equals(str2);}public static String upper(String str1){if(str1==null)return "";return str1.toUpperCase();}public static int find(String find_text,String within_text,int start_num){if(start_num<=0||start_num>within_text.length())throw new IllegalArgumentException("start_num參數輸入問題");if(find_text.length()>within_text.length())return -1;String tag=within_text.substring(start_num-1);int index=tag.indexOf(find_text);if(index<0)return -1;return index+start_num;}public static void main(String[] args) {/*******************測試字串*****************************/System.out.println(mid("我想要編程",2,2));System.out.println(left("我想要編程",2));System.out.println(right("我想要編程",3));System.out.println(concatenate("a","b","c","d"));System.out.println(exact(new String("aaa"),new String("aaa")));System.out.println(upper("aaaa"));System.out.println(find("b","abcabc",3));}}

JAVA實現EXCEL公式專題（四）——字串函數