将全局的ArrayList 生成局部的ArrayList，全局arraylist

将全局的ArrayList 生成局部的ArrayList，全局arraylist

private List<String> list = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    list.add("111");
    list.add("222");
    list.add("333");
    list.add("4444");
    Log.i("MainActivity", " 000  list  =  " + list);
    initList(list);
}

public void initList(List<String> list) {
    List<String> liss = new ArrayList<>(list);
    Log.i("MainActivity", " 111  liss  =  " + liss);
}