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Which collection classes are thread-safe in Java?
A thread-safe class is a class that guarantees the internal state of the class as well as returned values from methods, are correct while invoked concurrently from multiple threads. The collection classes that are thread-safe in Java are Stack, Vector, Properties, Hashtable, etc.
Stack
The Stack class in Java implements the stack data structure that is based on the principle of LIFO. So, the Stack class can support many operations such as push, pop, peek, search, empty, etc.
Example
import java.util.*;
public class StackTest {
public static void main (String[] args) {
Stack<Integer> stack = new Stack<Integer>();
stack.push(5);
stack.push(7);
stack.push(9);
Integer num1 = (Integer)stack.pop();
System.out.println("The element popped is: " + num1);
Integer num2 = (Integer)stack.peek();
System.out.println("The element on stack top is: " + num2);
}
}
Output
The element popped is: 9 The element on stack top is: 7
Vector
An array of objects that grow as required is implemented by the Vector class in Java. The Vector class can support the methods like add(), remove(), get(), elementAt(), size(), etc.
Example
import java.util.*;
public class VectorTest {
public static void main(String[] arg) {
Vector vector = new Vector();
vector.add(9);
vector.add(3);
vector.add("ABC");
vector.add(1);
vector.add("DEF");
System.out.println("The vector is: " + vector);
vector.remove(1);
System.out.println("The vector after an element is removed is: " + vector);
}
}
Output
The vector is: [9, 3, ABC, 1, DEF] The vector after an element is removed is: [9, ABC, 1, DEF]
Updated on: 29-Nov-2023
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