Relational Operators - Java Language Basics

Java examples for Language Basics:Operator

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Introduction

All relational operators are binary operators.

List of Relational Operators in Java

Operators Meaning Type UsageResult
== Equal to Binary 3 == 2 false
!= Not equal to Binary 3 != 2 true
> Greater than Binary 3 > 2true
>= Greater than or equal to Binary 3 >= 2 true
< Less thanBinary 3 < 2false
<= Less than or equal toBinary 3 <= 2 false 
double d1 = 0.0; 
double d2 = -0.0; 
boolean b = (d1 == d2); // Assigns true to b

A positive infinity is equal to another positive infinity.

A negative infinity is equal to another negative infinity. However, a positive infinity is not equal to a negative infinity. 

double d1 = Double.POSITIVE_INFINITY; 
double d2 = Double.NEGATIVE_INFINITY; 
boolean b1 = (d1 == d2); // Assigns false to b1 
boolean b2 = (d1 == d1); // Assigns true to b2

If either operand is NaN, the equality test returns false. 

double d1 = Double.NaN; 
double d2 = 5.5; 
boolean b = (d1 == d2); // Assigns false to b

Note that even if both the operands are NaN, the equality operator will return false. 

d1 = Double.NaN; 
d2 = Double.NaN; 
b = (d1 == d2); // Assigns false to b

Float and Double classes have an isNaN() method, which accepts a float and a double argument, respectively.

It returns true if the argument is NaN, Otherwise, it returns false. 

double d1 = Double.NaN; 
b = Double.isNaN(d1); // Assigns true to b. Correct way to test for a NaN value

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