java list两两合并的10种方式
public static<T> List<T> merge(List<T> list1, List<T> list2) { List<T> list = new ArrayList<>(); list.addAll(list1); list.addAll(list2); return list; } public static<T> List<T> merge2(List<T> list1, List<T> list2) { List<T> list = new ArrayList<>(list1); list.addAll(list2); return list; } public static<T> List<T> merge3(List<T> list1, List<T> list2) { return new ArrayList<T>() {{ addAll(list1); addAll(list2); }}; } public static List<String> merge4(List<String> list1, List<String> list2) { List<String> list = new ArrayList<>(); Collections.addAll(list, list1.toArray(new String[0])); Collections.addAll(list, list2.toArray(new String[0])); return list; } public static<T> List<T> merge5(List<T> list1, List<T> list2) { return Stream.of(list1, list2) .flatMap(x -> x.stream()) .collect(Collectors.toList()); } public static<T> List<T> merge6(List<T> list1, List<T> list2) { List<T> list = new ArrayList<>(); Stream.of(list1, list2).forEach(list::addAll); return list; } // Generic method to join two lists in Java public static<T> List<T> merge7(List<T> list1, List<T> list2) { List<T> list = list1.stream().collect(Collectors.toList()); list.addAll(list2); return list; } // Generic method to join two lists in Java public static<T> List<T> merge8(List<T> list1, List<T> list2) { return Lists.newArrayList(Iterables.concat(list1, list2)); } // Generic method to join two lists in Java public static<T> List<T> merge9(List<T> list1, List<T> list2) { List<T> list = Lists.newArrayList(); Iterables.addAll(list, list1); Iterables.addAll(list, list2); return list; } // Generic method to join two lists in Java public static<T> List<T> merge10(List<T> list1, List<T> list2) { return ListUtils.union(list1, list2); }
原文地址:https://blog.csdn.net/renshen4322/article/details/142577862
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