# পাঠ ১৯: ক্লাস ফাইল এবং বাইটকোড * ক্লাসলোডিং এবং ক্লাস অবজেক্ট * MethodHandle * MethodType * Looking up method handles * Examining class files * বাইটকোড * disassembling a class * রানটাইম ইনভারনমেন্ট * অপকোড * লোড অপকোড * অ্যারিথম্যাটিক অপকোড * Execution control opcodes * Invocation opcodes * Platform operation opcodes * উদাহরণ—string concatenation * Invokedynamic * ইনভোটডাইনামিক কি এবং কিভাবে কাজ করে * উদাহরণ --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://java.howtocode.dev/19.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.