In Java, which collection classes are thread-safe?-javaTutorial-php.cn

In Java, which collection classes are thread-safe?

Athread-safeclass means that when multiple threads call it at the same time, it ensures that the internal state of the class and the value returned by the method are correct. . In Java, somethread-safecollection classes includeStack,Vector,Properties,Hashtable, etc.

Stack

TheStackclass in Java implements a stack data structure based on theLIFOprinciple. Therefore, theStackclass supports many operations, such aspush, pop, peek, search, empty, etc.

Example

import java.util.*; public class StackTest { public static void main (String[] args) { Stack stack = new Stack(); 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); } }

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Output

The element popped is: 9 The element on stack top is: 7

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##Vector

Vector ## in Java #Class implements anarray of objects that grows as needed. The Vector class can supportadd(), remove(), get(), elementAt(), size()and other methodsExample

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); } }

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Output

The vector is: [9, 3, ABC, 1, DEF] The vector after an element is removed is: [9, ABC, 1, DEF]

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