去除字符串里的空格

public static void trim(StringBuffer sb){int i = 0;int k = 0;boolean flag1 = true;//是否第一个空格boolean flag2 = true;//是否已标记第一个空格while(i<sb.length()){if(sb.charAt(i)==' '&&flag1){k = i;flag2 = true;flag1 = false;}if(sb.charAt(i)!=' '&&flag2){sb.delete(k, i);flag1 = true;flag2 = false;i = k;}i++;}}