具体代码如下所示：

public class Student { private String id; private String name; private String age; private String address; public Student(String id, String name, String age, String address) { this.id = id; this.name = name; this.age = age; this.address = address; } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } @Override public String toString() { return "Student{" + "id='" + id + '\'' + ", name='" + name + '\'' + ", age='" + age + '\'' + ", address='" + address + '\'' + '}'; }}public class TestStrean { public static void main(String[] args){ Student stuA = new Student("1", "A", "M", "184"); Student stuB = new Student("2", "B", "G", "163"); Student stuC = new Student("3", "C", "M", "175"); Student stuD = new Student("4", "D", "G", "158"); Student stuE = new Student("5", "E", "M", "175"); List<Student> list = new ArrayList<>(); list.add(stuA); list.add(stuB); list.add(stuC); list.add(stuD); list.add(stuE); // list.forEach(item -> item.setId(item.getAddress()+"test") ); // List<Student> newList=list.stream().filter(item -> item.getAge().contains("G")).collect(Collectors.toList()); // list.stream().filter(new Predicate<Student>(){//// @Override// public boolean test(Student student) {// if(student.getName() !=null){// return student.getName().contains("30");// }else{// return true;// }// }// }).collect(Collectors.toList()); // List<Student> newList=list.stream().skip(4).limit(3).collect(Collectors.toList()); // List<Student> newList=list.stream().map(item ->{// return new Student(// item.getAddress(),// item.getAge(),// item.getName(),// item.getId()// );// }).collect(Collectors.toList()); // List<Student> newList=list.stream().map(item ->{// item.setId("1");// return item;// }).collect(Collectors.toList()); // List<Student> newList= list.stream().flatMap(item ->{// String[] split =item.getAddress().split("");// String[] s2 = (String[]) Arrays.stream(split).filter(s -> s.contains("1")).toArray();// return s2;// }); // List<Student> newList=list.stream().sorted((o1,o2)->{// if(o1.getAddress().equals(o2.getAddress())){// return Integer.parseInt(o1.getId())-Integer.parseInt(o2.getId());// }else{// return o1.getAddress().compareTo(o2.getAddress());// }// }).collect(Collectors.toList()); // List<Student> newList=list.stream().sorted(// Comparator.comparing(Student::getAddress).reversed()// ).collect(Collectors.toList()); // List<Student> newList=list.stream().sorted(// Comparator.comparing(Student::getAddress).thenComparing(Comparator.comparing(Student::getId).reversed())// ).collect(Collectors.toList());// boolean b=list.stream().anyMatch(item -> item.getAge().contains("G"));// System.out.println(b); // Map<String, String> newList=list.stream().sorted(// Comparator.comparing(Student::getAddress).thenComparing(Comparator.comparing(Student::getId).reversed())// ).collect(Collectors.toMap(Student::getId,Student::getAddress)); Map<String, List<Student>> ageMap = list.stream().collect(Collectors.groupingBy(Student::getAddress)); System.out.println(ageMap ); }}

知识点扩展：

jdk 1.8 Lambda 表达式 遍历数组

Lambda 表达式可以把回调函数作为参数传递

常用的遍历数组的方式如下

List<String> datas = new ArrayList<>(); //遍历 datas.forEach(item->{ System.out.println(item); });

说明：

item就是每次遍历的当前元素

总结

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