基础编程之删除空格

转载请注明作者与出处：franciscolv http://www.cnblogs.com/franciscolv/archive/2011/11/20/2256140.html 

package SortSet;
/**
 * @author franciscolv
 * 干掉字符串前后的空格和字符串中间多余的空格（中间只保留一个）
 */
public class DeleteSpace {
    public static void main(String[] args) throws Exception {
        String s = "  new    ada   dads  a     ";
        System.out.println(deleteSpace(s));
    }
    
    public static String deleteSpace(String s) {
        if(s==null)
            return null;
        StringBuilder sb = new StringBuilder();
        int i=0;
        while(s.charAt(i++)!=' ')
            break;
        char tail = s.charAt(i);
        for (;i<s.length();i++) {
            if (s.charAt(i) != ' ') {
                sb.append(s.charAt(i));
                tail = s.charAt(i);
            } else {
                if (tail == ' ')
                    continue;
                sb.append(s.charAt(i));
                tail = s.charAt(i);
            }
        }
        if(tail ==' ')
            sb.deleteCharAt(sb.length()-1);
        return sb.toString();
    }
}