FinCheck Variables, Data Types & Operators Implementation  

After successfully understanding Java Program Structure and Console Output inside the FinCheck Project, your manager now assigns you responsibility for handling Transaction-Related Testing Data using Java Variables and Operators.

During testing activities, QA Testers frequently work with :-

Customer Names
Account Numbers

Transaction Amounts
Transaction Status Values

Recently, new QA Team Members were unable to understand how Application Data is stored and processed inside Java Programs.
Because of this, testers were making mistakes while validating Balances and Transaction

Outputs.

Before starting testing activities, your manager clearly says :-
“If a QA Tester cannot understand how Data is stored and calculated inside Java Programs, Validation Logic becomes difficult to understand. “”

Your responsibility is to understand :-

How Variables Store Testing Data
How Different Data Types Work
How Operators Perform Calculations
How Transaction Balances are Updated
How Java Programs Process Validation Values

• Declare variables
• Use data types (int, double, String)
• Perform calculations
• Store transaction values​

Understand & Create Variables 

What is Variable?

Variable is a storage container used to store data inside Java programs.

QA testers use variables to store :-

• customer names

• account numbers

• transaction amounts

• balances

• validation results

How Variables Work

• Tester creates variable.

• Value gets stored inside memory.

• Program uses stored value during execution.

• Stored value displays inside console output.

Real Life Example

Tester stores :-

• customer name = Rahul

• account number = 101001

• transaction amount = 5000

inside Java variables. 

Syntax

VARIABLE DECLARATION AND ASSIGN SYNTAX

• Create Java class

• Create variables inside main method

• Store customer information

• Print stored values

Understand & create Data Types

What is Data Type?

Data type defines what kind of value a variable can store inside Java program.

Different testing data requires different data types.

Types of Java Data Types

• Primitive Data Types

      Primitive data types store simple values directly inside memory.

Types of primitive Data Types

• boolean

     Stores true or false values.

• char

     Stores single character value.

• float

     Stores decimal values with smaller precision.

• double

     Stores decimal values with larger precision.

• byte

     Stores very small whole numbers.

• short

     Stores small numeric values.

• int

     Stores whole numbers.

• long

     Stores very large whole numbers.

• Non primitive Data Types

Non-primitive data types store multiple values or complex information.

Types of non-primitive Data Types

• String

     Stores text values.

• Array

     Stores multiple values inside single variable.

• Class

     Used to create objects and program structure.

Real Life Example

Tester stores :-

• customer name using String

• transaction amount using int

• balance using double

Syntax

• Refer variable declaration syntax

• Create variables using multiple data types

• Store transaction values

• Print stored output

Understand Operators

What are Operators?

Operators are symbols used to perform calculations and operations inside Java programs.

QA testers use operators during :-

• balance calculations

• transaction validations

• amount verification

• testing logic execution

Types of Operators

• Arithmetic Operator

Arithmetic operators are used to perform mathematical calculations inside Java programs.

Types of Arithmetic Operators

• Addition Operator (+)

• Subtraction Operator (-)

• Multiplication Operator (*)

• Division Operator (/)

• Modulus Operator (%)

• Comparison Operators

Comparison operators are used to compare two values.

These operators return result as :- true or false

Types of Comparison Operators

• Equal To Operator (==)

• Not Equal To Operator (!=)

• Greater Than Operator (>)

• Less Than Operator (<)

• Greater Than Equal To (>=)

• Less Than Equal To (<=)

• Logical Operators

Logical operators are used to combine multiple conditions.

Types of Logical Operators

2. OR Operator (||)

At least one condition must be true otherwise if all conditions are false then end result will be false

  1. AND Operator (&&)

Both Condition must be true then end result will be true otherwise always it will be false

• NOT Operator (!)

    Reverses the result

• Real Life Example

  Customer balance = 10000

  Withdrawal amount = 2000

  Updated balance = 8000

• Create balance variable

• Create withdrawal amount variable

• Perform subtraction operation

• Display updated balance

Understand Transaction Calculations 

What is Transaction Calculation?

Transaction calculation means updating balance after debit or credit transaction.

Banking applications perform calculations whenever transaction occurs.

Types of Transaction Calculations

• Debit Calculation

Amount gets deducted from balance.

• Credit Calculation

Amount gets added to balance.

How Transaction Calculation Works

• System reads current balance.

• Transaction amount gets processed.

• Updated balance gets calculated.

• Output displays inside console.

Real Life Example

Current balance = 15000

Debit amount = 5000

Remaining balance = 10000 

Debit Transaction

• Create balance variable

• Create debit amount variable

• Create remaining balance variable

• Perform subtraction calculation

• Store calculation value into remaining balance variable

• Display remaining balance

Credit Transaction

• Create balance variable

• Create credit amount variable

• Create update balance variable

• Perform addition calculation

• Store calculation value into update balance variable

• Display updated balance

Good Job!!

In this lab, you learned Java Variables, Data Types, and Operators used for transaction calculations and validations.

You also practiced Storing Transaction Data, performing Calculations, and Verifying Console Output.

By completing this lab, you now understand how QA Testers Handle Data and Validate Transaction Outputs using Java.

• Use if-else conditions
• Validate transaction rules
• Handle valid/invalid scenarios
• Print results