How does Vector implement synchronization?

Question Posted / maria

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How does Vector implement synchronization?..

Answer / azad bajaj

Almost all the methods in the Vector class are synchronized.
All the methods which either change (read or write) the
values, or change the size or the change the capacity of
the vector.
example method:

public synchronized void setElementAt(E obj, int index) {
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException
(index + " >= " + elementCount);
}
elementData[index] = obj;
}

or

public synchronized void removeElementAt(int index) {
modCount++;
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException
(index + " >= " +

elementCount);
}
else if (index < 0) {
throw new ArrayIndexOutOfBoundsException
(index);
}
int j = elementCount - index - 1;
if (j > 0) {
System.arraycopy(elementData, index + 1,
elementData, index, j);
}
elementCount--;
elementData[elementCount] = null; /* to let gc
do its work */
}

Is This Answer Correct ?

5 Yes

1 No

How does Vector implement synchronization?..

Answer / swamy

import java.util.Vector;

public class VectorExample {

public static void main(String[] args) {

Vector<String> vc=new Vector<String>();

// <E> Element type of Vector e.g. String, Integer, Object ...

// add vector elements
vc.add("Vector Element 1");
vc.add("Vector Element 2");
vc.add("Vector Element 3");
vc.add("Vector Element 4");
vc.add("Vector Element 5");

// add vector element at index
vc.add(3, "Element at fix position");

// vc.size() inform number of elements in Vector
System.out.println("Vector Size :"+vc.size());

// get elements of Vector
for(int i=0;i<vc.size();i++)
{
System.out.println("Vector Element "+i+" :"+vc.get(i));
}
}
}

Is This Answer Correct ?

1 Yes

1 No

How does Vector implement synchronization?..

Answer / bln

Vector class by defualt is thread safe, thus all methods of
Vector class are synchronized.

Is This Answer Correct ?

4 Yes

8 No

How does Vector implement synchronization?..

Answer / srinu

By default Vector class are Thread safe,thus all methods of
vector class are synchronized

Is This Answer Correct ?

1 Yes

7 No

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