示例代码:
public static void main(String[] args) {
List<TestObject> testObjectList = new ArrayList<>();
TestObject testObject = new TestObject();
testObject.setId(1);
testObject.setName("张三");
testObject.setSex("男");
testObjectList.add(testObject);
TestObject testObject1 = new TestObject();
testObject1.setId(2);
testObject1.setName("李四");
testObject1.setSex("男");
testObjectList.add(testObject1);
TestObject testObject2 = new TestObject();
testObject2.setId(3);
testObject2.setName("张三");
testObject2.setSex("男");
testObjectList.add(testObject2);
List<TestObject> result = testObjectList.stream().filter(distinctByKey(e -> e.getName())).collect(Collectors.toList());
System.out.println(JSONObject.toJSONString(result));
}
/**
* 〈功能描述〉属性去重
*
* @param keyExtractor
* @return java.util.function.Predicate<T>
* @throws
* @author caic
* @see
*/
private static <T> Predicate<T> distinctByKey(Function<? super T, ?> keyExtractor) {
Map<Object, Boolean> seen = new ConcurrentHashMap<>();
return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}
输出结果:
[{"id":1,"name":"张三","sex":"男"},{"id":2,"name":"李四","sex":"男"}]