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
