ArrayList Size vs Capacity: Understanding the Difference

ArrayList Capacity vs Size 📦 ArrayList Size vs Capacity – Not the Same! Many developers think size = capacity. 🔹 Size → Number of elements actually present 🔹 Capacity → Internal array length Example: ArrayList<String> list = new ArrayList<>(10); 👉 Size = 0 👉 Capacity = 10 When size exceeds capacity → resizing happens. ⚠ Frequent resizing = performance cost. #Java #ArrayList #CollectionsFramework #BackendDevelopment #SoftwareEngineering #JavaDeveloper #Programming #TechTips #PerformanceOptimization #day43ofJavaandSpringboot

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