如何将列表转换为Java中的数组?
检查下面的代码:
ArrayList<Tienda> tiendas;
List<Tienda> tiendasList;
tiendas = new ArrayList<Tienda>();
Resources res = this.getBaseContext().getResources();
XMLParser saxparser = new XMLParser(marca,res);
tiendasList = saxparser.parse(marca,res);
tiendas = tiendasList.toArray();
this.adaptador = new adaptadorMarca(this, R.layout.filamarca, tiendas);
setListAdapter(this.adaptador);
我需要用tiendasList的值填充数组tiendas。
当前回答
你可以像下面这样使用toArray() api:
ArrayList<String> stringList = new ArrayList<String>();
stringList.add("ListItem1");
stringList.add("ListItem2");
String[] stringArray = new String[stringList.size()];
stringArray = stringList.toArray(stringList);
数组中的值为:
for(String value : stringList)
{
System.out.println(value);
}
其他回答
你可以像下面这样使用toArray() api:
ArrayList<String> stringList = new ArrayList<String>();
stringList.add("ListItem1");
stringList.add("ListItem2");
String[] stringArray = new String[stringList.size()];
stringArray = stringList.toArray(stringList);
数组中的值为:
for(String value : stringList)
{
System.out.println(value);
}
我认为这是最简单的方法:
Foo[] array = list.toArray(new Foo[0]);
对于ArrayList，以下工作:
ArrayList<Foo> list = new ArrayList<Foo>();
//... add values
Foo[] resultArray = new Foo[list.size()];
resultArray = list.toArray(resultArray);
示例取自此页:http://www.java-examples.com/copy-all-elements-java-arraylist-object-array-example
import java.util.ArrayList;
public class CopyElementsOfArrayListToArrayExample {
public static void main(String[] args) {
//create an ArrayList object
ArrayList arrayList = new ArrayList();
//Add elements to ArrayList
arrayList.add("1");
arrayList.add("2");
arrayList.add("3");
arrayList.add("4");
arrayList.add("5");
/*
To copy all elements of java ArrayList object into array use
Object[] toArray() method.
*/
Object[] objArray = arrayList.toArray();
//display contents of Object array
System.out.println("ArrayList elements are copied into an Array.
Now Array Contains..");
for(int index=0; index < objArray.length ; index++)
System.out.println(objArray[index]);
}
}
/*
Output would be
ArrayList elements are copied into an Array. Now Array Contains..
1
2
3
4
5
试试这个:
List list = new ArrayList();
list.add("Apple");
list.add("Banana");
Object[] ol = list.toArray();
