1️⃣
Collections.min() и Collections.max()
List<Integer> list = Arrays.asList(10, 5, 30, 7);
System.out.println(Collections.min(list)); // 5
System.out.println(Collections.max(list)); // 30
2️⃣
Collections.fill() — заполнение списка одним значением
List<String> list = new ArrayList<>(Arrays.asList("A", "B", "C"));
Collections.fill(list, "X");
System.out.println(list); // [X, X, X]
3️⃣
Collections.replaceAll() — замена значений
List<String> list = new ArrayList<>(Arrays.asList("яблоко", "груша", "яблоко"));
Collections.replaceAll(list, "яблоко", "банан");
System.out.println(list); // [банан, груша, банан]
4️⃣
Collections.frequency() — подсчет вхождений элемента
List<String> list = Arrays.asList("A", "B", "A", "C", "A");
int count = Collections.frequency(list, "A");
System.out.println(count); // 3
#java #Collections #min #max #fill #replaceAll #frequency
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