Use abstract classes or interfaces. 💡 Pro tip: Favour composition over inheritance for more flexible and testable designs. These 4 concepts appear in almost every Java backend interview. Master them!
𝗨𝗻𝗶𝘁 𝗧𝗲𝘀𝘁 𝗔𝗜 𝗚𝘂𝗶𝗱𝗲: 𝗭𝗲𝗿𝗼 𝗛𝗮𝗹𝗹𝘂𝗰𝗶𝗻𝗮𝘁𝗶𝗼𝗻 AI often fails at unit testing ...
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