JavaArrays.stream使用与实战技巧

// 整型数组
int[] numbers = {1, 2, 3, 4, 5};
Arrays.stream(numbers)
      .forEach(System.out::println);

// 字符串数组
String[] names = {"Alice", "Bob", "Charlie"};
Arrays.stream(names)
      .filter(name -> name.length() > 4)
      .forEach(System.out::println); // 输出 Alice Charlie

int[] scores = {85, 92, 78, 96, 88, 70};
Arrays.stream(scores, 1, 4) // 取索引1到3的元素
      .max()
      .ifPresent(System.out::println); // 输出 96

String[] mixed = {"Hello", null, "World", "", "Java"};
Arrays.stream(mixed)
      .filter(java.util.Objects::nonNull)
      .filter(s -> !s.isEmpty())
      .map(String::toUpperCase)
      .forEach(System.out::println);

int[][] matrix = {{1, 2}, {3, 4}, {5, 6}};
Arrays.stream(matrix)
      .flatMapToInt(Arrays::stream) // 将每行转为IntStream并合并
      .sum(); // 得到总和 21