This article will show you how to convert Java Array to List. There are two method in below java code. One method convert a Java String Array to String List, the other convert Java Object Array to Object List.
public class JavaArrayToListConverter {
public static void main(String[] args) {
/* Declare and initiate a String array. */
String strArr[] = {"TestNG", "Selenium", "WebDriver", "Hibernate", "Spring"};
JavaArrayToListConverter.stringArrayToList(strArr);
JavaArrayToListConverter.objArrayToList(strArr);
}
/* Convert a String array to an editable list. */
private static List<String> stringArrayToList(String strArr[])
{
/* Declare return object. */
List<String> retObj = new ArrayList<String>();
if(strArr!=null)
{
/* This method will covert the array to a not editable list which can not add or delete item because the list's length is fixed. */
retObj = Arrays.asList(strArr);
/* So below method will throw a java.lang.UnsupportedOperationException exception.
retObj.add("Hadoop");*/
/* Create a new editable list. */
List<String> retList = new ArrayList<String>();
/* Add all items in retObj (not editable) to retList (editable).*/
retList.addAll(retObj);
/* Point retObj to the retList. */
retObj = retList;
/* Now can add element in retObj. */
retObj.add("Hadoop");
/* Add element at specified index. */
retObj.add(2, "Sql Server");
/* Loop in retObj.*/
int size = retObj.size();
for(int i=0;i<size;i++)
{
String str = retObj.get(i);
/* Print out each item. */
System.out.println(str);
}
System.out.println("-----------------------------");
}
return retObj;
}
/* Convert an Object array to Object list. */
private static List<Object> objArrayToList(Object objArr[])
{
/* Declare return object. */
List<Object> ret = new ArrayList<Object>();
if(objArr!=null)
{
/* Get objArr size. */
int objArrSize = objArr.length;
/* Loop in the array, add each item to ret. */
for(int i=0;i<objArrSize;i++)
{
ret.add(objArr[i]);
}
/* ret is editable. So can add item to it. */
ret.add("Solr");
/* Add String at specified index. */
ret.add(2, "Lucent");
/* Loop in ret.*/
int size = ret.size();
for(int i=0;i<size;i++)
{
Object obj = ret.get(i);
/* Print out each item's value. */
System.out.println(obj.toString());
}
}
return ret;
}
}
[download id=”1804″]
