1. 程式人生 > >關於JAVA中字串函式subString()的用法

關於JAVA中字串函式subString()的用法

String str;

str=str.substring(int beginIndex);擷取掉str從首字母起長度為beginIndex的字串,將剩餘字串賦值給str;

str=str.substring(int beginIndex,int endIndex);擷取str中從beginIndex開始至endIndex結束時的字串,並將其賦值給str;

demo:

class Test
{
 public static void main(String[] args)
 {
  String s1 ="1234567890abcdefgh";
  s1 = s1.substring(10);
  System.out.println(s1);
 }
}

執行結果:abcdefgh

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

執行結果:123456789

下面是個典型例子:

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);
}
}

執行結果:

this is my string