public class StingTrimDemo 
{
//模拟一个trim方法， 去掉一个字符串两边的空格】，
	public static void main(String[] args)
	{
		// TODO Auto-generated method stub
		String s = "        my  java           ";

		System.out.println("未去空格前的字符串+++：[ "+s+" ]");
		//调用自定义去空格的方法
		myTrim(s);
	}
   private static void myTrim(String s)
  {
	  // TODO Auto-generated method stub
	  int start = 0,end = s.length()-1;
	  while(start<=end&&s.charAt(start)==' ')
		  start++;
	  while(start<=end&&s.charAt(end)==' ')
		  end--;
	  s=s.substring(start,end+1);
	  System.out.println("去掉前后空格后的字符串[ "+s+" ]");
 }
}