Reference or non-primitive data types have all the same size. and reference types can be used to call methods to perform certain operations. when declaring the reference type need to allocate memory.

The byte data type can be useful for saving memory in large arrays, where the memory savings actually matters. They can also be used in place of int where their limits help to clarify your code; the fact that …

Java.util.collections methods usually use the boxed (Object -wrapped) versions, because they need to work for any Object, and a primitive type, like int or long, is not an Object. Another difference is that …

May 24, 2017 · I am very new to Java having always issue with data types. So what are the default values for all data types in Java?

Oct 26, 2013 · List<String> sections = new ArrayList <String>(); that will be of String type. How can I create an ArrayList which can take both integer and string input types? Thank you.

Nov 5, 2013 · 7 From Primitives Data Types: float: The float data type is a single-precision 32-bit IEEE 754 floating point. Its range of values is beyond the scope of this discussion, but is specified in …

Sep 12, 2015 · Because Java is case sensitive and the class is String, not string. Try Int y = 4;, that won't work either. Primitive data types like int all start with lowercase, String isn't a primitive data type …

Feb 26, 2019 · In the JDBC docs of setObject I found this sentence: The JDBC specification specifies a standard mapping from Java Object types to SQL types. However, I cannot find where this mapping …

What can I use to store multiple different types of data, Int/String/etc.? I come from a PHP background where I can store different types of data into an array, but I don't know how to do that in Java.

Being new to Java, I'm confused between the concepts of class and type. For example, should the object "Hello World!" belong to the type String or class String? Or maybe both?