回答編集履歴
1
コメントを受けて追記
answer
CHANGED
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@@ -25,4 +25,36 @@
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25
25
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.forEach(System.out::println); // 3(a) -> 1(b) -> 4(c) -> 2(d) の順にソートされてる
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}
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}
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28
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```
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----
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31
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32
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MapのvalueだけのListにしたいなら↓
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33
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```java
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import java.util.*;
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36
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import java.util.stream.Collectors;
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37
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class Playground {
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private static class Obj {
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public String val;
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public Obj(String val) {
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this.val = val;
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}
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}
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public static void main(String[ ] args) {
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Map<String, Playground.Obj> map = new HashMap();
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map.put("1", new Playground.Obj("b"));
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map.put("2", new Playground.Obj("d"));
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map.put("3", new Playground.Obj("a"));
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map.put("4", new Playground.Obj("c"));
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List<Playground.Obj> list = map.values().stream()
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.sorted((e1, e2) -> e1.val.compareTo(e2.val))
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.collect(Collectors.toList());
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}
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}
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```
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