# Common Libraries/classes

## Object

* Always overide equals, toString, hascode
  * use a library to do this ie apache??? or guava???

### equals()

### toString()

### hashcode()

### clone()

## String

### Common methods

* toLowerCase() or toUpperCase()
  * useful for comparasions
* split()
  * use regex to split by, ie by , or whitespace

### Links

* [https://self-learning-java-tutorial.blogspot.co.uk/2014/07/basic-java.html](https://self-learning-java-tutorial.blogspot.co.uk/2014/07/basic-java.html)
  * Third way down page

## String Builder

????

## REGEX

????

## ArrayList/List

See

## Map/HashMap

See

## ZoneDateTime

See
