Credit Card Fraud Detection Engine using Predicate Functional Interface

Credit Card Fraud Detection Engine using Predicate Functional Interface | Java 8 Real-Time Example

June 28, 2026

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Credit Card Fraud Detection Engine using Predicate Functional Interface | Java 8 Real-Time Example

package org.practice.basicprgms;

public class CreditCardTransaction {

	private String cardNumber;
	private String customerName;
	private double amount;
	private String country;
	private boolean newDevice;
	private boolean midNightTransaction;
	
	public CreditCardTransaction(String cardNumber, String customerName, double amount, String country,
			boolean newDevice, boolean midNightTransaction) {
		super();
		this.cardNumber = cardNumber;
		this.customerName = customerName;
		this.amount = amount;
		this.country = country;
		this.newDevice = newDevice;
		this.midNightTransaction = midNightTransaction;
	}

	public String getCardNumber() {
		return cardNumber;
	}

	public void setCardNumber(String cardNumber) {
		this.cardNumber = cardNumber;
	}

	public String getCustomerName() {
		return customerName;
	}

	public void setCustomerName(String customerName) {
		this.customerName = customerName;
	}

	public double getAmount() {
		return amount;
	}

	public void setAmount(double amount) {
		this.amount = amount;
	}

	public String getCountry() {
		return country;
	}

	public void setCountry(String country) {
		this.country = country;
	}

	public boolean isNewDevice() {
		return newDevice;
	}

	public void setNewDevice(boolean newDevice) {
		this.newDevice = newDevice;
	}

	public boolean isMidNightTransaction() {
		return midNightTransaction;
	}

	public void setMidNightTransaction(boolean midNightTransaction) {
		this.midNightTransaction = midNightTransaction;
	}

	@Override
	public String toString() {
		return "CreditCardTransaction [cardNumber=" + cardNumber + ", customerName=" + customerName + ", amount="
				+ amount + ", country=" + country + ", newDevice=" + newDevice + ", midNightTransaction="
				+ midNightTransaction + "]";
	}	
}

package org.practice.basicprgms;

import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

public class CreditCardFraudDetection {

	public static void main(String[] args) {
		
		List<CreditCardTransaction> transactions =
				Arrays.asList(
					new CreditCardTransaction("TXN101", "4597-XXXX-XXXX-8745", 5000.00, "India", false, false),
					new CreditCardTransaction("TXN102", "4787-XXXX-XXXX-9345", 9000.00, "India", false, false),
					new CreditCardTransaction("TXN103", "4963-XXXX-XXXX-8743", 15000.00, "India", false, false),
					new CreditCardTransaction("TXN104", "4717-XXXX-XXXX-0005", 500000.00, "Koria", true, true),
					new CreditCardTransaction("TXN105", "9997-XXXX-XXXX-8793", 5000.00, "India", false, false)
						);
		
		Predicate<CreditCardTransaction> fradTransaction =
				txn -> txn.getAmount() > 100000 &&
						txn.isNewDevice() &&
						txn.isMidNightTransaction() &&
						!txn.getCountry().equalsIgnoreCase("India");
		
		transactions.stream()
					.filter(fradTransaction)
					.forEach(System.out::println);
		
		
	}
}

output:
CreditCardTransaction [cardNumber=TXN104, customerName=4717-XXXX-XXXX-0005, amount=500000.0, country=Koria, newDevice=true, midNightTransaction=true]