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Equality, Relational, and Conditional 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
Equality, Relational, and Conditional Operators
The Equality and Relational Operators

The equality and relational operators determine if one operand is greater than, less than, equal to, or not equal to another operand. The majority of these operators will probably look familiar to you as well. Keep in mind that you must use "==", not "=", when testing if two primitive values are equal.

==	equal to
!=	not equal to
>	greater than
>=	greater than or equal to
<	less than
<=	less than or equal to
The following program, ComparisonDemo, tests the comparison operators:
class ComparisonDemo {

     public static void main(String[] args){
          int value1 = 1;
          int value2 = 2;
          if(value1 == value2) System.out.println("value1 == value2");
          if(value1 != value2) System.out.println("value1 != value2");
          if(value1 > value2) System.out.println("value1 > value2");
          if(value1 < value2) System.out.println("value1 < value2");
          if(value1 <= value2) System.out.println("value1 <= value2");
     }
}
Output:
value1 != value2
value1 < value2
value1 <= value2

The Conditional Operators

The && and || operators perform Conditional-AND and Conditional-OR operations on two boolean expressions. These operators exhibit "short-circuiting" behavior, which means that the second operand is evaluated only if needed.

&& Conditional-AND
|| Conditional-OR

The following program, ConditionalDemo1, tests these operators:

class ConditionalDemo1 {

     public static void main(String[] args){
          int value1 = 1;
          int value2 = 2;
          if((value1 == 1) && (value2 == 2)) System.out.println("value1 is 1 AND value2 is 2");
          if((value1 == 1) || (value2 == 1)) System.out.println("value1 is 1 OR value2 is 1");

     }
}

Another conditional operator is ?:, which can be thought of as shorthand for an if-then-else statement (discussed in the Control Flow Statements section of this lesson). This operator is also known as the ternary operator because it uses three operands. In the following example, this operator should be read as: "If someCondition is true, assign the value of value1 to result. Otherwise, assign the value of value2 to result."

The following program, ConditionalDemo2, tests the ?: operator:

class ConditionalDemo2 {

     public static void main(String[] args){
          int value1 = 1;
          int value2 = 2;
          int result;
          boolean someCondition = true;
          result = someCondition ? value1 : value2;

          System.out.println(result);

     }
}

Because someCondition is true, this program prints "1" to the screen. Use the ?: operator instead of an if-then-else statement if it makes your code more readable; for example, when the expressions are compact and without side-effects (such as assignments).

The Type Comparison Operator instanceof

The instanceof operator compares an object to a specified type. You can use it to test if an object is an instance of a class, an instance of a subclass, or an instance of a class that implements a particular interface.

The following program, InstanceofDemo, defines a parent class (named Parent), a simple interface (named MyInterface), and a child class (named Child) that inherits from the parent and implements the interface.

class InstanceofDemo {
  public static void main(String[] args) {

    Parent obj1 = new Parent();
    Parent obj2 = new Child();

    System.out.println("obj1 instanceof Parent: " + (obj1 instanceof Parent));
    System.out.println("obj1 instanceof Child: " + (obj1 instanceof Child));
    System.out.println("obj1 instanceof MyInterface: " + (obj1 instanceof MyInterface));
    System.out.println("obj2 instanceof Parent: " + (obj2 instanceof Parent));
    System.out.println("obj2 instanceof Child: " + (obj2 instanceof Child));
    System.out.println("obj2 instanceof MyInterface: " + (obj2 instanceof MyInterface));
  }
}

class Parent{}
class Child extends Parent implements MyInterface{}
interface MyInterface{}
Output:
obj1 instanceof Parent: true
obj1 instanceof Child: false
obj1 instanceof MyInterface: false
obj2 instanceof Parent: true
obj2 instanceof Child: true
obj2 instanceof MyInterface: true
When using the instanceof operator, keep in mind that null is not an instance of anything.
Previous page: Assignment, Arithmetic, and Unary Operators
Next page: Bitwise and Bit Shift 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.


Web Hosting, web hosting, JSP, Servlets, Tomcat, website hosting, web site hosting
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