Basic difference between List and ArrayList is that List is an Interface and ArrayList is a Collection class. ArrayList implements List Interface.
Declaration and Initialization of List and ArrayList
import java.util.ArrayList;
import java.util.List;
public class Sample3 {
/**
* @param args
*/
public static void main(String[] args)
{
List<String> tempList=new ArrayList<String>();
tempList.add("Automation");
tempList.add("Manaual Testing");
tempList.add("Performance Testing");
}
}Traversing values in the List
import java.util.ArrayList;
import java.util.List;
public class Sample3
{
public static void main(String[] args)
{
List<String> tempList=new ArrayList<String>();
tempList.add("Automation");
tempList.add("Manaual Testing");
tempList.add("Performance Testing");
// Access specific value from the List using get(index) method
// where index starts from 0
// Below statement will return third value (Performance Testing) from the list
System.out.println(tempList.get(2));
// Using foreach loop to traverse all the values in a List
for (String string : tempList) {
System.out.println(string);
}
}
}Using List with Integer values
We can use all the methods as it is for integer values as well.
import java.util.ArrayList;
import java.util.List;
public class Sample3
{
public static void main(String[] args)
{
// Declare and Initialize for Integer values.
List<Integer> intList = new ArrayList<Integer>();
intList.add(50);
intList.add(80);
intList.add(100);
// Traversing all the integer values using foreach loop
for (Integer integer : intList) {
System.out.println(integer.intValue());
}
}
}Other Useful methods in the ArrayList
| Methods | Description | Example |
| List<DataType> var=new ArrayList<DataType>(); | Declaration of List having String and Integer datatypes. | List<String> tempList = new ArrayList<String>();List<Integer> intList = new ArrayList<Integer>(); |
| add(String) add(Integer) | To add values in the list. | tempList.add("Data1"); |
| add(index,value) | To add values at a specific position in the list. | tempList.add(3, "Data"); |
| isEmpty() | Return True if the list is empty. Else return False. | tempList.isEmpty(); |
| size() | Returns the total number of values present in the list | tempList.size(); |
| get(index) | Returns the value present at the given index. | tempList.get(2); |
| foreach loop | To traverse all the values in the list. | for (Integer value : intList) { System.out.println(value.intValue());} |
| clear() | Used to remove all values from the list. | intList.clear(); |
| remove(index) | Used to remove a value at the specified index. | intList.remove(2); |
| set(index, newValue) | It replaces existing value with newValue at given index. | intList.set(1, 110); |
| subList(fromIndex, toIndex) | Returns a sublist from the existing big list. It contains values fromIndex (including this index) till toIndex (excluding this index). | List<Integer> subList= intList.subList(0, 2);sublist will contain only 2 elements. |
| indexOf(value) | Searches the given value in a list and returns its index values. | tempList.indexOf("Data"));intList.indexOf(80); |
| lastIndexOf(value) | Searches the given value in a list and returns its last index values. | tempList.lastIndexOf("Data"));intList.lastIndexOf(80); |
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- Copy formatting & style of cells from one sheet to another.
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- User inputs via Command Prompt using arguments of main() method of a class.
- Program for List and ArrayList in Java.
- Useful methods and implementation under Scanner Class.
- Swapping two variable values without using any third variable.
- Difference between int x= 10 and y=010 in Java.
- Parameterized Constructors v/s Setter and Getter function in JAVA.
- Override a Static Method.
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