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Assignment, Arithmetic, and Unary Operators (The Java™ Tutorials > Learning the Java Language > Language Basics)
Trail: Learning the Java Language
Lesson: Language Basics
Section: Operators
Home Page > Learning the Java Language > Language Basics
Assignment, Arithmetic, and Unary Operators
The Simple Assignment Operator

One of the most common operators that you'll encounter is the simple assignment operator "=". You saw this operator in the Bicycle class; it assigns the value on its right to the operand on its left:

 int cadence = 0;
 int speed = 0;
 int gear = 1;

This operator can also be used on objects to assign object references, as discussed in Creating Objects.

The Arithmetic Operators

The Java programming language provides operators that perform addition, subtraction, multiplication, and division. There's a good chance you'll recognize them by their counterparts in basic mathematics. The only symbol that might look new to you is "%", which divides one operand by another and returns the remainder as its result.

+ 	additive operator (also used for String concatenation)
- 	subtraction operator
*	multiplication operator
/ 	division operator
%	remainder operator
The following program, ArithmeticDemo, tests the arithmetic operators.
class ArithmeticDemo {

     public static void main (String[] args){
          
          int result = 1 + 2; // result is now 3
          System.out.println(result);

          result = result - 1; // result is now 2
          System.out.println(result);

          result = result * 2; // result is now 4
          System.out.println(result);

          result = result / 2; // result is now 2
          System.out.println(result);

          result = result + 8; // result is now 10
          result = result % 7; // result is now 3
          System.out.println(result);

     }
}
You can also combine the arithmetic operators with the simple assignment operator to create compound assignments. For example, x+=1; and x=x+1; both increment the value of x by 1.

The + operator can also be used for concatenating (joining) two strings together, as shown in the following ConcatDemo program:

class ConcatDemo {
     public static void main(String[] args){
          String firstString = "This is";
          String secondString = " a concatenated string.";
          String thirdString = firstString+secondString;
          System.out.println(thirdString);
     }
}
By the end of this program, the variable thirdString contains "This is a concatenated string.", which gets printed to standard output.

The Unary Operators

The unary operators require only one operand; they perform various operations such as incrementing/decrementing a value by one, negating an expression, or inverting the value of a boolean.

+ 	Unary plus operator; indicates positive value (numbers are positive without this, however)
- 	Unary minus operator; negates an expression
++  	Increment operator; increments a value by 1
--    	Decrement operator; decrements a value by 1
!     	Logical complement operator; inverts the value of a boolean

The following program, UnaryDemo, tests the unary operators:

class UnaryDemo {

     public static void main(String[] args){
          int result = +1; // result is now 1
          System.out.println(result);
          result--;  // result is now 0
          System.out.println(result);
          result++; // result is now 1 
          System.out.println(result);
          result = -result; // result is now -1
          System.out.println(result);
          boolean success = false;
          System.out.println(success); // false
          System.out.println(!success); // true
     }
}
The increment/decrement operators can be applied before (prefix) or after (postfix) the operand. The code result++; and ++result; will both end in result being incremented by one. The only difference is that the prefix version (++result) evaluates to the incremented value, whereas the postfix version (result++) evaluates to the original value. If you are just performing a simple increment/decrement, it doesn't really matter which version you choose. But if you use this operator in part of a larger expression, the one that you choose may make a significant difference.

The following program, PrePostDemo, illustrates the prefix/postfix unary increment operator:

class PrePostDemo {
     public static void main(String[] args){
          int i = 3;
	  i++;
	  System.out.println(i);	// "4"
	  ++i;			   
	  System.out.println(i);	// "5"
	  System.out.println(++i);	// "6"
	  System.out.println(i++);	// "6"
	  System.out.println(i);	// "7"
     }
}
Previous page: Operators
Next page: Equality, Relational, and Conditional Operators

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java, Tomcat, MySQL, Apache and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


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