零基础学Java优学网Stream API课：从入门到实战，轻松掌握数据处理

List list = Arrays.asList("a", "b", "c"); Stream stream = list.stream();

List highSalaryEmployees = employees.stream()

.filter(emp -> emp.getSalary() > 10000)
.collect(Collectors.toList());

List numbers = Arrays.asList(1, 2, 3, 4, 5); int sum = numbers.stream()

.reduce(0, (a, b) -> a + b);

// 结果：15

List numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

// 方式一：直接创建并行流 long parallelCount = numbers.parallelStream()

.filter(n -> n % 2 == 0)
.count();

// 方式二：将顺序流转成并行流 long parallelCount2 = numbers.stream()

.parallel()
.filter(n -> n % 2 == 0)
.count();

class Employee {

private String name;
private String department;
private int salary;
private int age;

// 构造方法、getter、setter省略

}

List names = Arrays.asList("John", "Jane", "Jack"); Stream stream = names.stream(); names.add("Jill"); // 这行会怎样？ long count = stream.distinct().count();