字符串处理功能类StringProcessor

public class StringProcessorTest {   public static void main(String[] args){    String s1=StringProcessor.getSubString("yangyali",1,5);    System.out.println(s1);    String s2="woshiyangyalidehaopengyouyangyalishishui";    String s3="yangyali";    String s4=StringProcessor.getSubString(s2, s3);    System.out.println(s4);    String s5="yangyali";    String s6=StringProcessor.reverse(s5);    System.out.println(s6);public class StringProcessor {     //取得原始字符串s的前beginNum和后endNum个字符之间的子字符串    public static String getSubString(String s,int beginNum,int endNum){        s=s.substring(beginNum,endNum);        return s;    }    //取得S1中第一次出现S2和最后一次出现S2之间的字符串，如果S1中没有出现S2，或只出现S2一次则抛出异常    public static String getSubString(String s1,String s2){        int beginIndex=s1.indexOf(s2);        int endIndex=s1.lastIndexOf(s2);        s1=s1.substring(beginIndex+s2.length(), endIndex);        return s1;    }    //将原始字符串S1所有字符倒排后返回    public static String reverse(String s1){        char[]c=s1.toCharArray();//将字符串转换为字符数组        String s2=new String();        for(int i=c.length-1;i>=0;i--){            s2+=c[i];        }        return s2;    }}