Java中的Java流收集器toCollection()
Collection()Java中Collectors类的to方法返回一个Collector，该Collector以遇到的顺序将输入元素累积到一个新的Collection中。语法如下-
static <T,C extends Collection<T>> Collector<T,?,C> toCollection(Supplier<C> collectionFactory)
在这里，T-是输入元素的类型，C是结果集合的类型，Supplier是结果的供应商，Collection工厂是返回适当类型的新的空Collection的Supplier
示例
现在让我们看一个例子-
import java.util.Collection;
import java.util.TreeSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
Stream<String> stream = Stream.of("25", "10", "15", "20", "25");
Collection<String> collection = stream.collect(Collectors.toCollection(TreeSet::new));
System.out.println("Collection = "+collection);
}
}输出结果
Collection = [10, 15, 20, 25]
示例
让我们看另一个例子-
import java.util.Collection;
import java.util.TreeSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
Stream<String> stream = Stream.of("Jack", "Tom", "Brad", "Tim", "Kevin", "Bradley", "Ryan");
Collection<String> collection = stream.collect(Collectors.toCollection(TreeSet::new));
System.out.println("Collection = "+collection);
}
}输出结果
Collection = [Brad, Bradley, Jack, Kevin, Ryan, Tim, Tom]