Discussion :: Objects and Collections - General Questions (Q.No.3)
| Jagan M Reddy said: (Aug 29, 2011) | |
| What about java.util.list, I think its correct but I think its interface. I have doubt over here please can u solve it for me ? | |
| Omprakash said: (Jan 25, 2013) | |
| The current code will not compile due to the error introduced due to incorrect paranthesis. The correct code would be, java.io.PrintWriter out = new java.io.PrintWriter(new java.io.OutputStreamWriter(System.out), true); PrintWriter accepts OutputStream and boolean as its arguments in one its constructor. The above code will ensure that the PrintWriter obj acts as System.out |
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| Mac said: (May 10, 2015) | |
| @Jagan. Yes, java.util.List is an interface and it is a subtype of the java.util.Collection interface. |
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| Deepak said: (Nov 10, 2015) | |
| Methods are not synchronized? But vector has synchronized, then how to it not synchronized? |
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| Faruque said: (Nov 28, 2015) | |
| The java.util.ArrayList.get(int index) method returns the element at the specified position in this list. Following is the declaration for java.util.ArrayList.get() method public E get(int index) For example: import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { // create an empty array list with an initial capacity ArrayList<Integer> arrlist = new ArrayList<Integer>(5); // use add() method to add elements in the list arrlist.add(15); arrlist.add(22); arrlist.add(30); arrlist.add(40); System.out.println(arrlist); // let us print all the elements available in list for (Integer number : arrlist) { System.out.println("Number = " + number); } // retrieves element at 4th postion int retval=arrlist.get(3); System.out.println("Retrieved element is = " + retval); } } Output: [15, 22, 30, 40]. Number = 1. Number = 22. Number = 30. Number = 40. Retrieved element is = 40. |
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