Java8新特性 Collection新增方法（五）

系统管理员 2022-12-19 06:06 188阅读 0赞

// Collection新增方法
    public class Lambda1 {
    
        public static List<Integer> createListByInteger() {
            List<Integer> list = Lists.newArrayList(1, 2, 32, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0);
            return list;
        }
    
        public static List<String> createListByString() {
            List<String> list = Lists.newArrayList("1", "2", "32", "3", "4", "5", "6", "7", "8", "9", "10", "11", "0");
            return list;
        }
    
        public static void collectionAdd() {
            List<Integer> list = createListByInteger();
    
            // 删除列表中大于5的数
            list.removeIf(item -> item > 5);
            System.out.println(list.toString());
    
            System.out.println("*******************************************");
    
            // 对每个元素进行替换
            List<Integer> list1 = createListByInteger();
            list1.replaceAll(item -> {
                return item > 5 ? item - 10 : item;
            });
            System.out.println(list1.toString());
    
            System.out.println("*******************************************");
    
            // 排序
            List<Integer> list2 = createListByInteger();
            // 正序排列
            list2.sort((a1, a2) -> a1 - a2);
            System.out.println(list2.toString());
    
            System.out.println("###########################################");
    
            // 倒叙排列
            Comparator<Integer> comparator = (a1, a2) -> a1.compareTo(a2);
            list2.sort(comparator.reversed());
            System.out.println(list2.toString());
    
            System.out.println("*******************************************");
        }
    
    
        public static void main(String[] args) {
            collectionAdd();
        }
    }

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