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                ## List轉換為Map 以Student對象為例存進List中 ``` public class Student{ private int id; private String name; set,get方法省略; } ``` - 方式一 以List存放的對象的某一字段值為轉換后Map的鍵 以List存放的對象的某一字段值為轉換后Map的值 ``` list.stream().collect(HashMap::new,(k, v) ->k.put(v.getId(),v.getName()),HashMap::putAll); ``` - 方式二 以List存放的對象的某一字段值為轉換后Map的鍵 以List存放的對象為轉換后Map的值 ``` (Map<Integer, Student>) list.stream().collect(Collectors.toMap(Student::getId, v -> v, (k1, k2) -> k1)); ```
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