List to Array
List toArray provides interface, so you can directly call into object array
List<String> list = new ArrayList<String>(); Object[] array=list.toArray();
Flip a cast method described above in the presence of anomalies, such embodiment also recommend the following: you can specify the type
String[] array=list.toArray(new String[list.size()]);
Array to List
The easiest way seems to be so
String [] Array = { "Java", "C"};
List <String> list = Arrays.asList (Array);
// but there are some drawbacks to this method, the list returned by a static inner class Arrays inside, this class does not implement add, remove method, there is a limitation in the use of
public static <T> List <T> asList (A T ...) {
// Note that this is not ArrayList of java.util.ArrayList
// Java. util.Arrays.ArrayList.ArrayList <T> (T [])
return new new the ArrayList <> (A);
}
solution:
1, the construction method using ArrayList is at present the most perfect way, the code is simple and efficient: List <String> List = new new ArrayList <String> (Arrays.asList (Array));
List<String> list = new ArrayList<String>(Arrays.asList(array));
//ArrayList构造方法源码
public ArrayList(Collection<? extends E> c) {
elementData = c.toArray();
size = elementData.length;
// c.toArray might (incorrectly) not return Object[] (see 6260652)
if (elementData.getClass() != Object[].class)
elementData = Arrays.copyOf(elementData, size, Object[].class);
}
2, the use of Collections of addAll methods is also a good solution
List<String> list = new ArrayList<String>(array.length); Collections.addAll(list, array);