Android去除字符串中空格制表符换行

约定不等于承诺〃 2022-06-09 05:19 942阅读 0赞

两种方法 去除字符串中空格制表符换行：

public String checkString(String str) {
            if (TextUtils.isEmpty(str)) return "";
            int len = str.length();
            int i = 0, j = 0;
            char[] strChar = str.toCharArray();
            for (; i < len; i++) {
                if (' ' == strChar[i] || '\t' == strChar[i] || '\n' == strChar[i])
                    continue;
                if (i != j) strChar[j] = strChar[i];
                j++;
            }
            //strChar[j] = 0;//C/C++中0是结束标志位需要添加该语句，Java中会越界，需要注释该句；
            return new String(Arrays.copyOf(strChar, j));
        }

利用正则表达式

public static String replaceBlank(String src) {
            String dest = "";
            if (src != null) {
                Pattern pattern = Pattern.compile("\t|\r|\n|\\s*");
                Matcher matcher = pattern.matcher(src);
                dest = matcher.replaceAll("");
            }
            return dest;
        }

补充两种去除的算法

//2.1 Delete
        int k = 0;
        int i = 0;
        while (i < NowListSize)
        {
            if (NowListFlag[i] == 0)
            {
                NowList[i]->deleteIcon();
            }
            else
            {
                NowList[k++] = NowList[i];
            }
            i++;
        }
        NowListSize = k;

或者

int pos = 0;
        for (int j = 0; j < NowListSize; j++)
        {
            if (NowListFlag[j + pos] == 0)
            {
                NowList[j + pos]->deleteIcon();
                pos++;
                NowListSize--;
                j--;
                continue;
            }
            NowList[j] = NowList[j + pos];
        }