java - What's the difference between primitive and reference types ...
51 These are the primitive types in Java: boolean byte short char int long float double All the other types are reference types: they reference objects. This is the first part of the Java tutorial about the basics …
java - How to declare an array of different data types - Stack Overflow
I am working with arrays in Java and I have got a question. I know that an array in Java is a collection of similar data types, as shown below: int[] x = new int[]{1,2,3}; The above declaration ca...
Why does Java's Arrays.sort method use two different sorting …
Jul 3, 2018 · 161 Java 6's Arrays.sort method uses Quicksort for arrays of primitives and merge sort for arrays of objects. I believe that most of time Quicksort is faster than merge sort and costs less …
java - Is an array a primitive type or an object (or something else ...
Oct 9, 2012 · The Java Language Specification should give you an idea: The direct superclass of an array type is Object. Every array type implements the interfaces Cloneable and java.io.Serializable. …
Java Array with multiple data types - Stack Overflow
Java is a strongly typed language. In PHP or Javascript, variables don't have a strict type. However, in Java, every object and primative has a strict type. You can store mutliple types of data in an Array, …
java - Create an ArrayList with multiple object types? - Stack Overflow
Oct 26, 2013 · How do I create an ArrayList with integer and string input types? If I create one as: List<Integer> sections = new ArrayList <Integer>(); that will be an Integer type ArrayList. If I ...
java - make arrayList.toArray () return more specific types - Stack ...
Feb 21, 2011 · So, normally ArrayList.toArray() would return a type of Object[]....but supposed it's an Arraylist of object Custom, how do I make toArray() to return a type of Custom[] rather than Object[]?
Converting an array of objects to an array of their primitive types
Feb 19, 2009 · If you have an array of Java objects which have a primitive type (for example Byte, Integer, Char, etc). Is there a neat way I can convert it into an array of the primitive type? In particular …
Java, easiest way to store mixed-data types in a multidimensional array ...
Apr 27, 2011 · Ive got a file with some String and ints I wish to store in a 2D 'array'. What is the best way of doing this? I havent done Java for a while and i've been using VBA (where you have no …
java - What is a raw type and why shouldn't we use it? - Stack Overflow
May 5, 2010 · Questions: What are raw types in Java, and why do I often hear that they shouldn't be used in new code? What is the alternative if we can't use raw types, and how is it better?