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StreamsDemo.java
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StreamsDemo.java
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import java.util.*;
import java.util.stream.*;
class StreamsDemo{
public static void main(String args[]){
// create a list of integers
List<Integer> number = Arrays.asList(7, 3, 9, 2);
// demonstration of map method
List<Integer> MultThree = number.stream().map(x -> x*3).collect(Collectors.toList());
System.out.println(MultThree);
// create a list of String
List<String> names = Arrays.asList("Game","Startup","Leave");
// demonstration of filter method
List<String> result1 = names.stream().filter(s->s.startsWith("S")).collect(Collectors.toList());
System.out.println(result1);
List<String> result2 = names.stream().filter(s->s.endsWith("e")).collect(Collectors.toList());
System.out.println(result2);
// demonstration of sorted method
List<String> show = names.stream().sorted().collect(Collectors.toList());
System.out.println(show);
// create a list of integers
List<Integer> numbers = Arrays.asList(6, 2, 1);
// collect method returns a set
Set<Integer> MultFour = numbers.stream().map(x->x*4).collect(Collectors.toSet());
System.out.println(MultFour);
// demonstration of forEach method
number.stream().map(x->x*x).forEach(y->System.out.println(y));
// demonstration of reduce method
int even = number.stream().filter(x->x%2==0).reduce(0,(ans,i)-> ans+i);
System.out.println(even);
}
}