Core Operators 💡

Quick Index

Overview
Simple Assignment Operator
Arithmetic Operators
The Equality and Relational Operators
The Conditional or Logical Operators
Increment And Decrement Operators (++ and --)
Special Operators

Recall from algebra:

a + b
50 - 30
2 * z

Where +, -, * are operators.
And a, b, 50, 30, 2 and z are operands.

Simple Assignment Operator

Operator	Meaning
=	Simple assignment operator

Arithmetic Operators

Operator	Meaning
+	Additive operator (also used for String concatenation)
-	Subtraction operator
*	Multiplication operator
/	Division operator
%	Remainder operator

The Equality and Relational Operators

Operator	Meaning
==	equal to
!=	not equal to
>	greater than
>=	greater than or equal to
<	less than
<=	less than or equal to

The Conditional or Logical Operators

Operator	Meaning
&&	Conditional-AND
\|\|	Conditional-OR

Increment And Decrement Operators (++ and --)

Increment Operator Examples

The "++" operator is shorthand. These are equivalent:

z = z + 1;
z++;

Example

Output:

Before: 0
After: 1

		int z = 0;
		prn("Before: " + z);
		z++;
		prn("After: " + z);

Post vs Pre Options

Post foo++

This is probably the more common way to use the increment operator

foo++

Pre ++foo

but we can also use the pre-operator

++foo

Increment Operator Gotcha

Caution: As the output shows below, we go through the iteration fine with "index++" but cause a bounds exception for "++index". Can you see why? Copy the code into your lab and give it a play.

Output:

Printing using post incrment operator
Name: A
Name: B
Printing using pre incrment operator
Name: B
Exception in thread "main"
ArrayIndexOutOfBoundsException:

		String[] names = {"A", "B"};
		int index;

		prn("Printing using post incrment operator");
		index = 0;
		while (index < names.length)
			prn("Name: " + names[index++]);

		prn("Printing using pre incrment operator");
		index = 0;
		while (index < names.length)
			prn("Name: " + names[++index]);

Decrement Operator (--)

The "--" operator is shorthand. These are equivalent:

z = z - 1;
z--;

The examples and pre/post discussion for the "++" operator apply to the "--" operator as well.

Special Operators

Operator	Name	Definition	Example
?:	ternary operator	if condition ? value for true case : value for false case	max = (a < b) ? a : b;

Introduction To Objects With Java (Chapter 601 - Primitive Data)

Chapter 601 - Primitive Data Core Operators 💡

Contents Intro Prims Core Operators Advanced Operators Gotcha Examples

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