Vector

01What is Vector?

Vector is an older implementation of the List interface, very similar to ArrayList, but with all its methods synchronized, meaning it is safe to use across multiple threads simultaneously.

02Why is it used?

Vector is used in situations where thread safety for list operations is genuinely required, though in modern Java, other approaches are often preferred for new projects.

03Real-Life Example

Think of a single shared notice board where only one person is allowed to write on it at a time, ensuring nothing gets overwritten or lost due to two people writing simultaneously. Vector behaves similarly across threads.

java
Vector<DataType> vectorName = new Vector<>();

java
import java.util.Vector;

public class VectorDemo {
    public static void main(String[] args) {
        Vector<String> colors = new Vector<>();
        colors.add("Red");
        colors.add("Blue");
        System.out.println(colors);
    }
}

[Red, Blue]