Advanced/src/common/StreamE1.java · notfand/LearnJava

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src

common

StreamE1.java

StreamE1.java 3.82 KB

package common;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamE1 {
 static void old() {
 for (int i=0; i<10; i++) {
 int r = (int)(Math.random()*10);
 System.out.println(r);
 }
 }

static void new1() {
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 generate.limit(10).forEach(System.out::println);
 }

static void new2() {
 // 生成10个0-10的随机数,并输出
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 generate.limit(10).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static List<Integer> new3() {
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 return generate.limit(10).collect(Collectors.toList());
 }

static void distinct() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();

list.stream().distinct().forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void filter() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出大于5的数
 list.stream().filter(x -> x >= 5).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void map() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出 x的平方
 list.stream().map(x -> x*x).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void flatMap() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出x 和 x的平方
 list.stream().flatMap(x -> Stream.of(x, x*x)).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void peek() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 在输出x前,先输出2*x
 list.stream().peek(x -> System.out.print(2*x + " ")).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void skip() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 跳过前4个数
 list.stream().skip(4).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void sort1() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 排序
 list.stream().sorted().forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void sort2() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 逆序排序
 list.stream().sorted((x1, x2) -> x2-x1).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

static void reduce() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // reduce 求和
 int s = list.stream().reduce((sum, x) -> x+sum).get();
 System.out.println("sum = " + s);
 }

static void reduce2() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // reduce 求积
 int s = list.stream().reduce(1, (f, x) -> x*f);
 System.out.println("积 = " + s);
 }

public static void main(String[] args) {
 sort1();
 }
}

一键复制编辑原始数据按行查看历史

yswift 提交于 2019年05月06日 19:31 +08:00 . add stream demo

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package common;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamE1 {
 static void old() {
 for (int i=0; i<10; i++) {
 int r = (int)(Math.random()*10);
 System.out.println(r);
 }
 }

 static void new1() {
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 generate.limit(10).forEach(System.out::println);
 }

 static void new2() {
 // 生成10个0-10的随机数,并输出
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 generate.limit(10).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static List<Integer> new3() {
 Stream<Integer> generate = Stream.generate(() -> (int)(Math.random()*10));
 return generate.limit(10).collect(Collectors.toList());
 }

 static void distinct() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();

 list.stream().distinct().forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void filter() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出大于5的数
 list.stream().filter(x -> x >= 5).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void map() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出 x的平方
 list.stream().map(x -> x*x).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void flatMap() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 输出x 和 x的平方
 list.stream().flatMap(x -> Stream.of(x, x*x)).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void peek() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 在输出x前,先输出2*x
 list.stream().peek(x -> System.out.print(2*x + " ")).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void skip() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 跳过前4个数
 list.stream().skip(4).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void sort1() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 排序
 list.stream().sorted().forEach(x -> System.out.print(x + " "));
 System.out.println();
 }

 static void sort2() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // 逆序排序
 list.stream().sorted((x1, x2) -> x2-x1).forEach(x -> System.out.print(x + " "));
 System.out.println();
 }


 static void reduce() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // reduce 求和
 int s = list.stream().reduce((sum, x) -> x+sum).get();
 System.out.println("sum = " + s);
 }

 static void reduce2() {
 List<Integer> list = new3();
 list.forEach(x -> System.out.print(x + " "));
 System.out.println();
 // reduce 求积
 int s = list.stream().reduce(1, (f, x) -> x*f);
 System.out.println("积 = " + s);
 }

 public static void main(String[] args) {
 sort1();
 }
}