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import java.util.*; import java.util.stream.Collectors; import java.util.stream.Stream; import static java.util.List.*; class Actor { private String name; private Integer age; public Actor(String name, int age) { this.name = name; this.age = age; } public void setAge(Integer age) { this.age = age; } public Integer getAge() { return age; } public String getName() { return name; } public void setName(String name) { this.name = name; } } public class Main1 { public static void main(String[] args) { // System.out.println("Hello World!"); // // List<String> list = of("张三1", "李四", "王五", "张六2"); // list.stream().filter(name -> name.startsWith("张")).filter(name -> name.length() == 3).forEach(System.out::println); // ArrayList<String> list = new ArrayList<>(); // Collections.addAll(list,"a","b","c","d","e"); Stream<String> stream = list.stream(); // list.stream().forEach(System.out::println); ArrayList<String> list = new ArrayList<>(); Collections.addAll(list,"张无忌-男-15","周芷若-女-14","赵敏-女-13","张强-男-20","张三丰-男-100","张翠山-男-40","张良-男-35","王二麻子-男-37","谢广坤-男-41"); // String[] array = list.stream().toArray(value -> new String[value]); // System.out.println(Arrays.toString(array)); // list.stream().filter(e -> "男".equals(e.split("-")[1])).collect(Collectors.toList()).forEach(System.out::println); //System.out.println("---------------------"); // list.stream().filter(e -> "男".equals(e.split("-")[1])).collect(Collectors.toSet()).forEach(System.out::println); // System.out.println("-----------to Map-----------"); // list.stream().filter(e -> "男".equals(e.split("-")[1])).collect(Collectors.toMap(e -> e.split("-")[0], e -> e.split("-")[2])).forEach((k,v) -> System.out.println(k + ":" + v)); System.out.println("-----------Practice 1-----------"); ArrayList<Integer> integers = new ArrayList<>(); Collections.addAll(integers,1,2,3,4,5,6,7,8,9,10); integers.stream().filter(ele->ele%2==0).forEach(System.out::println); System.out.println("-----------Practice 2-----------"); ArrayList<String> list1 = new ArrayList<>(); Collections.addAll(list1,"zhangsan,23","lisi,24","wangwu,25"); list1.stream().filter(strEle->Integer.parseInt(strEle.split(",")[1])>=24).collect(Collectors.toMap(strEle->strEle.split(",")[0],strEle->strEle.split(",")[1])).forEach((k,v)->System.out.println(k+":"+v)); System.out.println("-----------Practice 3-----------"); ArrayList<String> L1 = new ArrayList<>(); Collections.addAll(L1,"蔡坤坤,24","叶齁咸,23","刘不甜,22","吴签,24","谷嘉,30”,“肖梁梁,27"); ArrayList<String> L2 = new ArrayList<>(); Collections.addAll(L2,"赵小颖,35","杨颖,36","高元元,43","张天天,31","刘诗,35","杨小幂,33"); Stream<String> stream1 = L1.stream().filter(e -> e.split(",")[0].length() == 3).limit(2); Stream<String> stream2 = L2.stream().filter(e -> e.split(",")[0].startsWith("杨")).skip(1); Stream.concat(stream1,stream2).map(e->new Actor(e.split(",")[0],Integer.parseInt(e.split(",")[1])) ).collect(Collectors.toList()).forEach(actor-> System.out.println(actor.getName()+"---"+actor.getAge())); } } 