为什么String的toUpperCase不是静态方法,但可以String::toUpperCase来调用?
List myList =
Arrays.asList("a1", "a2", "b1", "c2", "c1");
myList
.stream()
.filter(s -> s.startsWith("c"))
.map(String::toUpperCase)
.sorted()
.forEach(System.out::println);
泽涛คิดถึง
2019/04/14 15:39- java
- java-ee
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