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  1. 求和(Sum):
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);int sum = numbers.stream().mapToInt(Integer::intValue).sum();System.out.println("Sum: " + sum);
  1. 求平均值(Average):
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);double average = numbers.stream().mapToInt(Integer::intValue).average().orElse(0.0);System.out.println("Average: " + average);
  1. 最大值(Max):
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);int max = numbers.stream().mapToInt(Integer::intValue).max().orElse(0);System.out.println("Max: " + max);
  1. 最小值(Min):
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);int min = numbers.stream().mapToInt(Integer::intValue).min().orElse(0);System.out.println("Min: " + min);
  1. 计数(Count):能够应用count()办法来计算Stream中元素的个数。
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);long count = numbers.stream().count();System.out.println("Count: " + count);
  1. 连贯字符串(Joining):能够应用collect()办法联合Collectors.joining()来将Stream中的元素连接成一个字符串。
List<String> names = Arrays.asList("Alice", "Bob", "Charlie");String joinedNames = names.stream().collect(Collectors.joining(", "));System.out.println("Joined Names: " + joinedNames);
  1. 分组(Grouping):能够应用collect()办法联合Collectors.groupingBy()来依据某个属性对Stream中的元素进行分组。
List<Person> people = Arrays.asList(    new Person("Alice", 25),    new Person("Bob", 30),    new Person("Charlie", 25));Map<Integer, List<Person>> peopleByAge = people.stream().collect(Collectors.groupingBy(Person::getAge));System.out.println("People grouped by age: " + peopleByAge);
  1. 求和(Summarizing):能够应用collect()办法联合Collectors.summarizingInt()等办法来获取元素的汇总信息,如求和、平均值、最大值、最小值等。
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);IntSummaryStatistics stats = numbers.stream().collect(Collectors.summarizingInt(Integer::intValue));System.out.println("Sum: " + stats.getSum());System.out.println("Average: " + stats.getAverage());System.out.println("Max: " + stats.getMax());System.out.println("Min: " + stats.getMin());

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