import java.util.Arrays;
import java.util.stream.Stream;
import java.util.*;

public class StreamDemo {
	public static void main(String[] args) {
		String str="I am demo";
		List<String> list=Arrays.asList(str.split(" "));
		Stream<String> stream=list.stream();
		Optional<String> s= stream.filter(l->l.contains("m")).findFirst();
		System.out.println(s.orElse("No Patten"));//當沒有匹配值的時候進行返回
	}
}