java 如何比较Arraylist 和list的值

Question

java 如何比较Arraylist 和list 的值
arraylist 如何转变为list集合

Answer 1

比较：先排序，在比较

ArrayList<String> arrayList = new ArrayList<String>();
arrayList.add("foo");
arrayList.add("bar");

List<String> list = new ArrayList<String>();
list.add("bar");
list.add("foo");

Collections.sort(arrayList);
Collections.sort(list);

if(arrayList.equals(list)) {
    System.out.println("ArrayList and List have the same elements");
} else {
    System.out.println("ArrayList and List have different elements");
}

arraylist 如何转变为list集合

ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(1);
arrayList.add(2);

// Convert ArrayList to List using constructor
List<Integer> list1 = new ArrayList<Integer>(arrayList);

// Convert ArrayList to List using addAll() method
List<Integer> list2 = new ArrayList<Integer>();
list2.addAll(arrayList);