How to create a memory leak in Java? Examples and causes

Hello everyone. I'm a beginner Java developer, and I constantly hear that Java has a garbage collector that automatically cleans up memory. But I was told that even with GC you can get a memory leak. I tried to understand how this is possible, but all the examples I found are too complex or use old versions of Java.\n\nI need to write a small educational project that demonstrates a memory leak to better understand how the garbage collector works and how to avoid such problems in real work. I tried simply creating many objects in a loop without saving references — but GC cleans them up. How can I make objects stay in memory and not be deleted?\n\nHere's an example I tried, but it doesn't lead to a leak:\n\n```java\npublic class MemoryLeakTest {\n public static void m