List<Integer> list = new ArrayList<Integer>();

list.add(2);

list.add(4);

list.add(0);

list.add(100);

System.out.println("----------------stream---------------------");

list.stream().filter(e -> e > 4).forEach(System.out::println);

Stream<Integer> list1 = list.stream().filter(e -> e > 0);

Iterator<Integer> iter = list1.iterator();

while (iter.hasNext()) {

System.out.println(iter.next());

}

System.out.println("--------------filter 条件查询--------------------");

list = list.stream().filter(e -> e > 2).collect(Collectors.toList());

list.forEach(System.out::println);

List<Student> studentlist=new ArrayList<Student>();

studentlist.add(new Student("A",12));

studentlist.add(new Student("B",5));

studentlist.add(new Student("C",16));

studentlist.add(new Student("D",2));

System.out.println("取出集合中对象指定属性");

studentlist.stream().map(Student::getName).forEach(System.out::println);

System.out.println("-----------------------------按对象属性正序---------------------------------------------");

studentlist.stream().sorted(Comparator.comparing(Student::getAge)).forEach(System.out::println);

System.out.println("-----------------------------按对象属性倒序---------------------------------------------");

studentlist.stream().sorted(Comparator.comparing(Student::getAge).reversed()).forEach(System.out::println);

studentlist=studentlist.stream().sorted(Comparator.comparing(Student::getAge).reversed()).collect(Collectors.toList());

System.out.println("----------------------------stream 转化为集合输出----------------------------------------------");

studentlist.forEach(System.out::print);

class Student{

private String name;

private Integer age;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public Student(String name, Integer age) {

super();

this.name = name;

this.age = age;

}

public Student() {

super();

}

@Override

public String toString() {

return "Student [name=" + name + ", age=" + age + "]";

}

}