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springboot_interview_notes

☕ Java Interview Preparation Guide

MongoDB & PostgreSQL in Spring Boot

• 📌 𝐖𝐡𝐲 𝐝𝐨𝐞𝐬 𝐉𝐚𝐯𝐚 𝐮𝐬𝐞 𝐩𝐮𝐛𝐥𝐢𝐜 𝐬𝐭𝐚𝐭𝐢𝐜 𝐯𝐨𝐢𝐝 𝐦𝐚𝐢𝐧(𝐒𝐭𝐫𝐢𝐧𝐠[] 𝐚𝐫𝐠𝐬)) ? – 𝐄𝐱𝐩𝐥𝐚𝐢𝐧𝐞𝐝!
• 💡𝐉𝐃𝐊 𝐯𝐬. 𝐉𝐕𝐌 𝐯𝐬. 𝐉𝐑𝐄 – 𝐖𝐡𝐚𝐭' 𝐬 𝐭𝐡𝐞 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞?
• 🔹 𝗝𝗮𝘃𝗮 𝗠𝗲𝗺𝗼𝗿𝘆 𝗠𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁: 𝗦𝘁𝗮𝗰𝗸 𝘃𝘀. 𝗛𝗲𝗮𝗽
• 🔹𝗝𝗮𝘃𝗮 𝗦𝘁𝗿𝗶𝗻𝗴 𝗣𝗼𝗼𝗹 – 𝗪𝗵𝗮𝘁 𝗜𝘀 𝗜𝘁 & 𝗪𝗵𝘆 𝗗𝗼𝗲𝘀 𝗜𝘁 𝗠𝗮𝘁𝘁𝗲𝗿?
• Deep Copy
• 🔹 𝗨𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝗶𝗻𝗴 𝗝𝗮𝘃𝗮 𝗗𝗮𝘁𝗮 𝗧𝘆𝗽𝗲𝘀 – 𝗔 𝗖𝗼𝗿𝗲 𝗖𝗼𝗻𝗰𝗲𝗽𝘁 𝗳𝗼𝗿 𝗘𝘃𝗲𝗿𝘆 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿
• 💡 Control Flow in Java – if, switch, loops & Common Pitfalls
• 💡 OOPs in Java with Real Life Analogy
• Deep Dive into Java Keywords: static, final, & this
• 📌 Access Modifiers In Java
• 📦 Understanding Packages in Java – In-Depth Guide
• 💡 String vs StringBuilder vs StringBuffer – Detailed Comparison with Examples
• 🚨 Java Exception Handling – Explained