In this chapter you will learn:
- What is logical/Conditional operator in Java?
- Logical operator symbol
- Programming example
What is logical operator in Java?
Logical operator is also known as conditional operator in java. It is And (&&), Or(||) andNot(!). The logical operator is very useful when you need to compare two statements.
| Operator | Description | Example |
| && | Conditional-AND – Compare two statement and return true if both are true | if(username==”user1″ && password==”pass123″) |
| || | Conditional-OR – compare two statement and return true if one of them is true | if(username==”user1″ || password==”pass123″) |
| ?: | Ternary (shorthand for if-then-else statement) | variable x = (expression) ? value if true : value if false |
You can understand the working of logical or conditional operator using this programming example:
Programming Example:
class LogicalOperator
{
public static void main(String[] args)
{
String username, password;
username="user1";
password="pass123";
if(username=="user1" && password=="pass123")
{
System.out.println("Authorized Login Successful");
}
else if(username=="user1" && password!="pass123")
{
System.out.println("Incorrect Password");
}
else if(username!="user1" && password=="pass123")
{
System.out.println("User Not Registered");
}
else
{
System.out.println("Incorrect UserID and Password");
}
}
}
Output
D:\JavaProgram>javac LogicalOperator.java
D:\JavaProgram>java LogicalOperator
Authorized Login Successful
D:\JavaProgram> __
Summary
In this chapter you have learned what is logical operator or conditional operator in Java. Mostly And(&&), Or(||) and Not(!) is considered as logical operator in Java. In the next chapter you will learn about Ternary Operator in Java.