Java流操作功能详解.pdf
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2022-07-02
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java.util.stream.Stream
Stream
List<String> names = menu.stream()
.filter(d -> d.getCalories() > 300)
.map(Dish::getName)
.limit(3)
.collect(toList());
q
filter
map
limit
q
collect
4-5
4-5
filter
sorted
——
Lambda
Stream
List
List<String> names =
menu.stream()
.filter(d -> {
System.out.println("filtering" + d.getName());
return d.getCalories() > 300;
})
.map(d -> {
System.out.println("mapping" + d.getName());
return d.getName();
})
.limit(3)
.collect(toList());
System.out.println(names);
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