Java ArrayList subList() Method
What is ArrayList in java ?
Arraylist is a part of collection framework in java. It contains several inbuilt function like subList() method which can be found in the java.util.ArrayList Package. It implements the List interface of the collections framework.
Java ArrayList subList() Method :
Gives a view of the part of the list between the fromIndex and toIndex values that are specified. (The returned list is empty if the fromIndex and toIndex values are equal.)
Since this list supports the returned list, any non-structural changes made to the returned list will also be reflected in the other way around. The returned list supports all of the optional list operations.
Syntax :
public List subList(int fromIndex, int toIndex)
Parameters :
- fromIndex – low endpoint (inclusive) of the subList
- toIndex – high endpoint (exclusive) of the subList
Return value:
This method returns a view of the specified range within this list.
Example 1 :
import java.util.ArrayList;
public class Main{
public static void main(String[] args) {
ArrayList list = new ArrayList<>();
//Adding elements to the list
list.add("A");
list.add("B");
list.add("C");
list.add("D");
list.add("E");
list.add("F");
//Printing the subList from index 2 to 5
System.out.println(list.subList(2, 5));
}
}
Output :
[C, D, E]
Example 2 :
import java.util.ArrayList;
public class Main{
public static void main(String[] args) {
ArrayList list = new ArrayList<>();
//Adding elements to the list
list.add("A");
list.add("B");
list.add("C");
list.add("D");
list.add("E");
list.add("F");
//Printing the subList from index 2 to 7
System.out.println(list.subList(2, 7));
}
}
Output :
Exception in thread "main" java.lang.IndexOutOfBoundsException: toIndex = 7
at java.base/java.util.AbstractList.subListRangeCheck(AbstractList.java:509)
at java.base/java.util.ArrayList.subList(ArrayList.java:1108)
at ArrayListSubList.main(ArrayListSubList.java:16) Prime Course Trailer
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