Java 集合去重的三种方法

List<MyObject> list = ...; // 假设这是你的原始列表
Set<MyObject> uniqueSet = new HashSet<>(list);
List<MyObject> uniqueList = new ArrayList<>(uniqueSet);

List<MyObject> list = ...;
List<MyObject> uniqueList = list.stream()
    .collect(Collectors.collectingAndThen(
        Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(MyObject::getProperty))),
        ArrayList::new
    ));

// 或者简化版本，如果MyObject直接或间接实现了Comparable接口：
List<MyObject> uniqueList = list.stream()
    .distinct()
    .collect(Collectors.toList());

List<MyObject> list = ...;
Map<String, MyObject> map = list.stream()
    .collect(Collectors.toMap(
        MyObject::getProperty, // key extractor function
        Function.identity(),   // value mapping function
        (o1, o2) -> o1       // merge function - 如果有冲突则保留第一个对象
    ));
List<MyObject> uniqueList = new ArrayList<>(map.values());