private static int getNum(String originStr, String targetStr){ int result = 0; for (int i = 0; i < originStr.length(); i++) { if (targetStr.equals(originStr.substring(i, i + 1))){ result ++; } } return result;}
private static int getNum(String originStr, String targetStr){ int res = 0; int i = originStr.indexOf(targetStr); while (i != -1){ i = originStr.indexOf(targetStr,i+1); res++; } return res;}
private static int getNum(String originStr, String targetStr){ int start = originStr.startsWith(targetStr) ? 1 : 0; int end = originStr.endsWith(targetStr) ? 1 : 0; String[] split = originStr.split(targetStr); return split.length - 1 + start + end;}
split方法使用需要注意边界问题,如果不注意,容易漏计算。除了这些还有其他方案吗?
replaceAll方法
private static int getNum(String originStr, String targetStr){ String result = originStr.replaceAll(targetStr, ""); int i = originStr.length() - result.length(); return i;}
沙发等你来坐!