🚀 How to Ensure Threads Run Alternately in Java (Thread Synchronization Guide)

👋 Introduction

When working with multi-threading, there are situations where two or more threads need to execute in an alternating manner.
For example, consider two threads:

🚀 How to Ensure Threads Run Alternately in Java (Thread Synchronization Guide)

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🔹 Thread A: Prints “Ping”
🔹 Thread B: Prints “Pong”

The expected output should be:

Ping  
Pong  
Ping  
Pong

This requires proper thread synchronization to prevent race conditions and ensure correct execution order.

⚠️ The Problem with Uncontrolled Execution

If you run the threads without synchronization, their execution order is unpredictable due to context switching by the JVM: