Java automatically converts decimal numbers you write in your source program into binary numbers internally.
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Integers are whole numbers, for example, -35, 0, 2048, .... Integers are represented in binary inside the computer, and in decimal in Java source programs. Java automatically converts decimal numbers you write in your source program into binary numbers internally.
Four (or five) kinds of primtive integers and two integer classes.
Primitive types. The are four types of integers in Java: byte, short, int, long. The most common is int. All integers are stored in signed, two's-complement, format.
char! Technically, char is an unsigned integer type altho it is almost exclusively used to store characters. Making it integer is largely because of Java's legacy from C++. Don't use char for integers unless you are sure of what you're doing.
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Getting started with Java 2D - JavaWorld - July 1998