Lesson 8	Using numeric operators
Objective	Use Java's commonly-used Numeric Operators

Numeric Operators in Java Programming

Numeric operators are used to manipulate numbers, and are divided across three different types: unary, binary, and relational.
Unary operators operate on a single number, with the two most commonly used unary operators being ++ and --.
These operators are used to increment or decrement a number by 1.
Unary operators in an expression can be used as either prefix or postfix operators. A prefix operator is applied before the expression is evaluated, while a postfix operator is applied after the expression is evaluated.
Following are the commonly used binary operators:

Binary Arithmetic Operators in Java

Addition and string concatenation — 1) Addition: Adds two numbers or concatenates two strings.

2) Subtraction: Subtracts a number from another number.

3) Multiplication: Multiples two numbers.

4) Division: Divides a number by another number.

5) Modulus: Determines the remainder of a division

Relational Operators

The following slide show presents a series of relational operators that are commonly used, which compare two numbers and return a Boolean (true or false) result:

Less-than: Compares two values and returns true if the first is less than the second.
Greater-than: Compares two values and returns true if the first is greater than the second
Less-than-or-equal-to: Compares two values and returns true if the first is less than or equal to the second.
Greater-than-or-equal-to: Compares two values and returns true if the first is greater than or equal to the second.
Equal-to: Compares two values and returns true if they are equal
Not-equal-to: Compares two values and returns true if they are not equal.

Relational Operators

Relational Operators

Relational operators are used to check one condition. You can use these operators to determine whether a primitive value is equal to another value or whether it is less than or greater than the other value. These relational operators can be divided into two categories:

Comparing greater (>, >=) and lesser values (<, <=)
Comparing values for equality (==) and nonequality (!=)

The operators <, <=, >, and >= work with all types of numbers, both integers (including char) and floating point, that can be added and subtracted.
Examine the following code:

int i1 = 10;
int i2 = 20;
System.out.println(i1 >= i2);

false

long long1 = 10;
long long2 = 20;
System.out.println(long1 <= long2);

true
The second category of operators is covered in the following section.