09 2021 档案
摘要：list.stream().collect(Collectors.toMap(Class::getParam, Function.identity(), (a, b) -> { a.setParam(a.getParam() + b.getParam()); .... return a; }));例
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摘要：private String getStackTraceAsString() { // StringWriter将包含堆栈信息 StringWriter stringWriter = new StringWriter(); //必须将StringWriter封装成PrintWriter对象， //以
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摘要：public static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) { Map<Object,Boolean> seen = new ConcurrentHashMap<>(); return t ->
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