Java8里的HashMap對象lambda遍歷方法

Java demo：

        Map<String, User> map = new HashMap<>();
        map.put("id1", new User(1,"name1"));
        map.put("id2", new User(2,"name2"));

        String str = map.entrySet().stream().map(entry ->
            "id[" + entry.getKey() + "], code=" + entry.getValue().getCode() + ", text=" + entry.getValue().getText()
        ).collect(Collectors.joining("; "));
        System.out.println("str==="+str);

 

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