Software design patterns in two pages

In software engineering, a software design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.

Java theory to prepare to Java interview

Overriding hashCode() and equals()

Exclude primitives, everything in Java is an object. Not just an object, but an Object with a capital O. Every exception, every event, every array extends from java.lang.Object. Main methods of Object in Java