JAVA中字符串函数subString的用法小结

string str;
str＝str.substring(int beginindex);截取掉str从首字母起长度为beginindex的字符串，将剩余字符串赋值给str；

str＝str.substring(int beginindex，int endindex);截取str中从beginindex开始至endindex结束时的字符串，并将其赋值给str;

demo:

class test
{
 public static void main(string[] args)
 {
  string s1 ="1234567890abcdefgh";
  s1 = s1.substring(10);
  system.out.println(s1);
 }
}

运行结果：abcdefgh

class test
{
 public static void main(string[] args)
 {
  string s1 ="1234567890abcdefgh";
  s1 = s1.substring(0,9);
  system.out.println(s1);
 }
}

运行结果：123456789

下面是个典型例子：

public class stringdemo{

public static void main(string agrs[]){

   string str="this is my original string";

   string todelete=" original";

   if(str.startswith(todelete))
    str=str.substring(todelete.length());
   else
    if(str.endswith(todelete))
     str=str.substring(0, str.length()-todelete.length());
    else
    {
     int index=str.indexof(todelete);
     if(index!=-1)
     {
      string str1=str.substring(0, index);
      string str2=str.substring(index+todelete.length());
      str=str1+str2;
     }
     else
      system.out.println("string /""+todelete+"/" not found");
    }
   system.out.println(str);
}
}

运行结果：
this is my string