使用Java8流将Object减少为Map

Question

如果我有类似的课程

public class Property {
    private String id;
    private String key;
    private String value;

    public Property(String id, String key, String value) {
        this.id = id;
        this.key = key;
        this.value = value;
    }
    //getters and setters
}

我有Set<Property> properties一些属性,我想减少到Map这些Property对象的键和值.

我的大多数解决方案最终都不那么温文尔雅.我知道有一种方便的方法来做这些,Collector但我还不熟悉Java8.有小费吗？

Answer 1

    Set<Property> properties = new HashSet<>();
    properties.add(new Property("0", "a", "A"));
    properties.add(new Property("1", "b", "B"));
    Map<String, String> result = properties.stream()
        .collect(Collectors.toMap(p -> p.key, p -> p.value));
    System.out.println(result);