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Java Basics

Logical Operator

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You learn how Java combines multiple conditions into a single decision using logical operators. Instead of only asking one question at a time, we can now build logic that depends on several conditions working together.

In a real coffee shop system, decisions are rarely simple — whether the system gives a discount, accepts an order, or shows a special message usually depends on more than one factor.

Operators

  • && — AND: returns true only if both conditions are true;
  • || — OR: returns true if at least one condition is true;
  • ! — NOT: reverses a boolean value — true becomes false and vice versa.

Example

Main.java

Main.java


              
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package com.example;

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

       int orderValue = 8;

       boolean isDeliveryAvailable = true;
       boolean isLoyalCustomer = false;
       boolean isWeekendPromo = true;

       boolean freeDelivery = isDeliveryAvailable && (orderValue > 10);
       boolean discount = isLoyalCustomer || isWeekendPromo;
       boolean showRegularPrice = !isWeekendPromo;

       System.out.println(freeDelivery);    // false
       System.out.println(discount);        // true
       System.out.println(showRegularPrice); // false
   }
}

The example sets up three conditions about the order state. freeDelivery uses && — both delivery must be available AND the order must exceed 10, but since orderValue is 8, the result is false. discount uses || — even though the customer is not loyal, the weekend promo is active, so the result is true. showRegularPrice uses ! to reverse isWeekendPromo, which gives false.

Logical operators are important because they allow combining multiple rules into a single decision instead of writing separate checks.

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What does the && operator do?

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Section 2. Chapter 5

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Section 2. Chapter 5
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