关于JAVA中字符串函数subString()的用法

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