something about Java

Java's primitive data types 
How to convert ArrayList containing Integers to primitive int array?
What's difference between Math.pow(9, 18) and 9^18?
Reading integers from a file into an array
2D dynamic array using ArrayList 
When to use LinkedList<> over ArrayList<> or vice-versa? 
Java Hashtable versus HashMap. 
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
What are some Java memory management best practices? 
Publications and regular columns from Brain Goetz
Struct like object in Java.