Vector is a member in Collections frame work of Java .It implements the List interface. It is a legacy class in java.Vector was in Java in the earlier versions itself.
Vector & ArrayList
Vector is almost same as that of ArrayList.Vector also based on index values for each items. But the methods in vector class are thread safe. This gives a little performance fall.Vector ,like ArrayList implements the interface RandomAccess .So the only difference between Vector and ArrayList is the thread safety of its methods.
Now let us see an example code and its output. It adds few string values to the vector .Displaying those values , then removing the strings.
import java.util.List;
import java.util.Vector;
public class VectorSample {
private List list = null;
public VectorSample() {
list = new Vector();
}
public void addItemsToList() {
String[] listItems = {"dog", "cat", "cow", "elephant", "sheep"};
for (int i = 0; i < listItems.length; i++) {
list.add(listItems[i]);
}
}
public void displayList() {
System.out.println("Displaying contents of vector");
for (String item : list) {
System.out.println("Item = " + item);
}
}
public void removeItems() {
System.out.println("Removing contents of list");
list.remove("dog");
list.remove("cat");
list.remove("cow");
list.remove("elephant");
list.remove("sheep");
System.out.println("Contents removed ,now size of vector = " + list.size());
}
public static void main(String[] args) {
VectorSample sample = new VectorSample();
sample.addItemsToList();
sample.displayList();
sample.removeItems();
}
}
Output
Displaying contents of vector
Item = dog
Item = cat
Item = cow
Item = elephant
Item = sheep
Removing contents of list
Contents removed ,now size of vector = 0