In Java, trash, or garbage, is heap memory that a program allocates for objects but no longer references; such memory serves no useful purpose.

In most cases, loitering objects arise from simple coding oversights or omissions, such as the failure to nullify a class-based or instance-based reference variable or neglecting to remove an object ...

Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.

Java stores object values in heap memory; references to the value are stored in the stack. Another way to create strings is to use the new keyword, as in the following example. String s1 = new String( ...

The "Understanding Java threads" series concludes by uncovering some of the loose ends of threading: thread groups, volatility, thread-local variables, timers, and thread death.