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Integer[] aa = {1,2,3};
int a = aa[0];
aa[0] = null;//实现删除
for(Integer i : aa){
System.out.println(i);
}
ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(1);
arrayList.add(2);
arrayList.add(3);
int i = arrayList.get(0);
arrayList.remove(0);// 实现删除
for(int a : arrayList){
System.out.println(a);
}
ArrayList list = new ArrayList();
ArrayList list2 = new ArrayList();
ArrayList list3 = new ArrayList();
ArrayList[] lists = new ArrayList[] {list,list2,list3};