04 2022 档案
摘要：String candidate = "this is a test, A TEST."; String regex = "[a-zA-Z]+"; Pattern p = Pattern.compile(regex); Matcher m = p.matcher(candidate);
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摘要：public static void main(String[] args) { Map<String, Integer> map = new HashMap(); map.put("13213", 8); Set<String> set=map.keySet(); map.entrySet();
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摘要：Arrays.copyof() int[] copied = Arrays.copyOf(arr, 10); //10 the the length of the new array System.out.println(Arrays.toString(copied)); copied = Arra
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