Java Interview Guide : 200+ Interview Questions and Answers - Asserts and Garbage Collection

The video tutorial covers two main topics: assertions and garbage collection in Java. It begins by explaining assertions, introduced in Java 1.4, as a way to check for conditions that should never occur in a program. Assertions are not meant for input validation; instead, exceptions like IllegalArgumentException should be used. The tutorial then shifts to garbage collection, describing how Java automatically manages memory by removing objects without references. It explains when garbage collection occurs, such as when memory is low or the CPU is idle, and advises against using System.gc() in code.

What are assertions in Java and when were they first introduced?

Explain the purpose of using assertions in a method.

What is the difference between an assertion error and an exception?

When should assertions not be used in Java?

Describe how garbage collection works in Java.

What triggers the garbage collection process in the JVM?

Why is it not recommended to call the System GC method from a program?