Just don’t do it.

• Don’t create new strings
• Don’t instantiate resource heavy classes in a loop
• Mind the unnecessary auto-boxing
• Make use of static fields or caching
• Make use of singleton pattern
• Opt for immutable objects and reuse them.

This post is based on Joshua Bloch Effective Java Third Edition (get it on Amazon: https://www.amazon.com/Effective-Java-3rd-Joshua-Bloch/dp/0134685997)