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CollectDemo.java
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44 lines (35 loc) · 1.47 KB
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package stream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class CollectDemo {
public static void main(String[] args) {
String[] names = {"John", "Peter", "Susan", "Kim", "Jen",
"George", "Alan", "Stacy", "Michelle", "john"};
System.out.println("The number of characters for all names: " +
Stream.of(names).collect(StringBuilder::new,
StringBuilder::append, StringBuilder::append).length());
List<String> list = Stream.of(names).collect(ArrayList::new,
ArrayList::add, ArrayList::addAll);
System.out.println(list);
list = Stream.of(names).collect(Collectors.toList());
System.out.println(list);
Set<String> set = Stream.of(names).map(e -> e.toUpperCase()).
collect(Collectors.toSet());
System.out.println(set);
Map<String, Integer> map = Stream.of(names).collect(
Collectors.toMap(e -> e, e -> e.length()));
System.out.println(map);
System.out.println("The total number of characters is " +
Stream.of(names).
collect(Collectors.summingInt(e -> e.length())));
java.util.IntSummaryStatistics stats = Stream.of(names).
collect(Collectors.summarizingInt(e -> e.length()));
System.out.println("Max is " + stats.getMax());
System.out.println("Min is " + stats.getMin());
System.out.println("Average is " + stats.getAverage());
}
}