package Java8Test;
import java.util.Arrays;
import java.util.IntSummaryStatistics;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;
/**
* @Classname StreamTest
* @Description TODO
* @Date 19-7-5 上åˆ11:00
* @Created by mao
*/
public class StreamTest {
public static void main(String[] args){
List strings = Arrays.asList("abc", "", "bc", "efg", "abcd","", "jkl");
List numbers = Arrays.asList(3, 2, 2, 3, 7, 3, 5);
List integers = Arrays.asList(1,2,13,4,15,6,17,8,19);
Random random = new Random();
System.out.println("使用 Java 8: ");
System.out.println("列表: " +strings);
long count = strings.stream().filter(string->string.isEmpty()).count();
System.out.println("空å—符串数é‡ä¸º: " + count);
count = strings.stream().filter(string -> string.length() == 3).count();
System.out.println("å—符串长度为 3 çš„æ•°é‡ä¸º: " + count);
List filtered = strings.stream().filter(string ->!string.isEmpty()).collect(Collectors.toList());
System.out.println("ç›é€‰åŽçš„列表: " + filtered);
String mergedString = strings.stream().filter(string ->!string.isEmpty()).collect(Collectors.joining(", "));
System.out.println("åˆå¹¶å—符串: " + mergedString);
List squaresList = numbers.stream().map( i ->i*i).distinct().sorted().collect(Collectors.toList());
System.out.println("平方åŽå¹¶æŽ’åºçš„列表: " + squaresList);
System.out.println("列表: " +integers);
IntSummaryStatistics stats = integers.stream().mapToInt((x) ->x).summaryStatistics();
System.out.println("列表ä¸æœ€å¤§çš„æ•° : " + stats.getMax());
System.out.println("列表ä¸æœ€å°çš„æ•° : " + stats.getMin());
System.out.println("所有数之和 : " + stats.getSum());
System.out.println("å¹³å‡æ•° : " + stats.getAverage());
System.out.println("éšæœºæ•°: ");
random.ints().limit(10).sorted().forEach(System.out::println);
// 并行处ç†
count = strings.parallelStream().filter(string -> string.isEmpty()).count();
System.out.println("空å—符串的数é‡ä¸º: " + count);
}
}