Live Demo & Examples

1. Interest Calculator (Banking)

Original: 250 lines of COBOL | Converted: Clean Java class with BigDecimal precision

COBOL Input Sample:

IDENTIFICATION DIVISION.
PROGRAM-ID. INTEREST-CALCULATOR.

DATA DIVISION.
WORKING-STORAGE SECTION.
01 WS-PRINCIPAL        PIC 9(8)V99.
01 WS-RATE            PIC 9V9(4).
01 WS-TIME            PIC 99.
01 WS-INTEREST        PIC 9(8)V99.

PROCEDURE DIVISION.
    COMPUTE WS-INTEREST = WS-PRINCIPAL * WS-RATE * WS-TIME / 100.
    DISPLAY "INTEREST: " WS-INTEREST.
    STOP RUN.

Java Output Sample:

import java.math.BigDecimal;

public class InterestCalculator {
    private BigDecimal principal;
    private BigDecimal rate;
    private int time;
    private BigDecimal interest;
    
    public void calculateInterest() {
        interest = principal.multiply(rate)
                           .multiply(new BigDecimal(time))
                           .divide(new BigDecimal(100));
        System.out.println("INTEREST: " + interest);
    }
}

2. Premium Calculator (Insurance)

Original: 400 lines of COBOL with complex business rules
Converted: Structured Java classes with validation

Includes age-based calculations, coverage tiers, and discount rules.

3. Tax Calculator (Government)

Original: 350 lines of COBOL with bracket calculations
Converted: Java with clear tax bracket logic

Features progressive tax brackets, deductions, and credits.

4. Payment Processor (Finance)

Original: 500 lines of COBOL for payment handling
Converted: Java with transaction management

Includes validation, balance checking, and transaction logging.

5. Customer Validator (Enterprise)

Original: 300 lines of COBOL for data validation
Converted: Java with comprehensive validation rules

Validates customer IDs, dates, amounts, and business rules.