diff --git a/DIRECTORY.md b/DIRECTORY.md
index f1a531486..19301ee33 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -504,6 +504,7 @@
* [FCFSScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/FCFSScheduling.java)
* [HighestResponseRatioNextScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/HighestResponseRatioNextScheduling.java)
* [JobSchedulingWithDeadline](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/JobSchedulingWithDeadline.java)
+ * [LotteryScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java)
* [MLFQScheduler](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/MLFQScheduler.java)
* [NonPreemptivePriorityScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/NonPreemptivePriorityScheduling.java)
* [PreemptivePriorityScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/PreemptivePriorityScheduling.java)
@@ -1039,6 +1040,7 @@
* [FCFSSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/FCFSSchedulingTest.java)
* [HighestResponseRatioNextSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/HighestResponseRatioNextSchedulingTest.java)
* [JobSchedulingWithDeadlineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/JobSchedulingWithDeadlineTest.java)
+ * [LotterySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java)
* [MLFQSchedulerTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/MLFQSchedulerTest.java)
* [NonPreemptivePrioritySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/NonPreemptivePrioritySchedulingTest.java)
* [PreemptivePrioritySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/PreemptivePrioritySchedulingTest.java)
diff --git a/pom.xml b/pom.xml
index 673be6cd4..812f46c70 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,6 +40,13 @@
${assertj.version}
test
+
+ org.mockito
+ mockito-core
+ 5.14.1
+ test
+
+
org.junit.jupiter
diff --git a/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java
new file mode 100644
index 000000000..cea0c793d
--- /dev/null
+++ b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java
@@ -0,0 +1,141 @@
+package com.thealgorithms.scheduling;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * The LotteryScheduling class implements the Lottery Scheduling algorithm, which is
+ * a probabilistic CPU scheduling algorithm. Processes are assigned tickets, and
+ * the CPU is allocated to a randomly selected process based on ticket count.
+ * Processes with more tickets have a higher chance of being selected.
+ */
+public final class LotteryScheduling {
+ private LotteryScheduling() {
+ }
+
+ private List processes;
+ private Random random;
+
+ /**
+ * Constructs a LotteryScheduling object with the provided list of processes.
+ *
+ * @param processes List of processes to be scheduled using Lottery Scheduling.
+ */
+ public LotteryScheduling(final List processes) {
+ this.processes = processes;
+ this.random = new Random();
+ }
+
+ /**
+ * Constructs a LotteryScheduling object with the provided list of processes and a Random object.
+ *
+ * @param processes List of processes to be scheduled using Lottery Scheduling.
+ * @param random Random object used for generating random numbers.
+ */
+ public LotteryScheduling(final List processes, Random random) {
+ this.processes = processes;
+ this.random = random;
+ }
+
+ /**
+ * Schedules the processes using the Lottery Scheduling algorithm.
+ * Each process is assigned a certain number of tickets, and the algorithm randomly
+ * selects a process to execute based on ticket count. The method calculates the
+ * waiting time and turnaround time for each process and simulates their execution.
+ */
+ public List scheduleProcesses() {
+ int totalTickets = processes.stream().mapToInt(Process::getTickets).sum();
+ int currentTime = 0;
+ List executedProcesses = new ArrayList<>();
+
+ while (!processes.isEmpty()) {
+ int winningTicket = random.nextInt(totalTickets) + 1;
+ Process selectedProcess = selectProcessByTicket(winningTicket);
+
+ if (selectedProcess == null) {
+ // This should not happen in normal circumstances, but we'll handle it just in case
+ System.err.println("Error: No process selected. Recalculating total tickets.");
+ totalTickets = processes.stream().mapToInt(Process::getTickets).sum();
+ continue;
+ }
+
+ selectedProcess.setWaitingTime(currentTime);
+ currentTime += selectedProcess.getBurstTime();
+ selectedProcess.setTurnAroundTime(selectedProcess.getWaitingTime() + selectedProcess.getBurstTime());
+
+ executedProcesses.add(selectedProcess);
+ processes.remove(selectedProcess);
+
+ totalTickets = processes.stream().mapToInt(Process::getTickets).sum();
+ }
+
+ return executedProcesses;
+ }
+
+ /**
+ * Selects a process based on a winning ticket. The method iterates over the
+ * list of processes, and as the ticket sum accumulates, it checks if the
+ * current process holds the winning ticket.
+ *
+ * @param winningTicket The randomly generated ticket number that determines the selected process.
+ * @return The process associated with the winning ticket.
+ */
+ private Process selectProcessByTicket(int winningTicket) {
+ int ticketSum = 0;
+ for (Process process : processes) {
+ ticketSum += process.getTickets();
+ if (ticketSum >= winningTicket) {
+ return process;
+ }
+ }
+ return null;
+ }
+
+ /**
+ * The Process class represents a process in the scheduling system. Each process has
+ * an ID, burst time (CPU time required for execution), number of tickets (used in
+ * lottery selection), waiting time, and turnaround time.
+ */
+ public static class Process {
+ private String processId;
+ private int burstTime;
+ private int tickets;
+ private int waitingTime;
+ private int turnAroundTime;
+
+ public Process(String processId, int burstTime, int tickets) {
+ this.processId = processId;
+ this.burstTime = burstTime;
+ this.tickets = tickets;
+ }
+
+ public String getProcessId() {
+ return processId;
+ }
+
+ public int getBurstTime() {
+ return burstTime;
+ }
+
+ public int getTickets() {
+ return tickets;
+ }
+
+ public int getWaitingTime() {
+ return waitingTime;
+ }
+
+ public void setWaitingTime(int waitingTime) {
+ this.waitingTime = waitingTime;
+ }
+
+ public int getTurnAroundTime() {
+ return turnAroundTime;
+ }
+
+ public void setTurnAroundTime(int turnAroundTime) {
+ this.turnAroundTime = turnAroundTime;
+ }
+ }
+}
diff --git a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java
new file mode 100644
index 000000000..00fd8adcd
--- /dev/null
+++ b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java
@@ -0,0 +1,64 @@
+package com.thealgorithms.scheduling;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+public class LotterySchedulingTest {
+
+ private Random mockRandom;
+
+ @BeforeEach
+ public void setup() {
+ mockRandom = mock(Random.class);
+ }
+
+ @Test
+ public void testLotterySchedulingWithMockedRandom() {
+ List processes = createProcesses();
+ LotteryScheduling lotteryScheduling = new LotteryScheduling(processes, mockRandom);
+
+ // Mock the sequence of random numbers (winning tickets)
+ // This sequence ensures that P1 (10 tickets), P3 (8 tickets), and P2 (5 tickets) are selected.
+ when(mockRandom.nextInt(23)).thenReturn(5, 18, 11); // winning tickets for P1, P3, and P2
+
+ List executedProcesses = lotteryScheduling.scheduleProcesses();
+
+ assertEquals(3, executedProcesses.size());
+
+ // Assert the process execution order and properties
+ LotteryScheduling.Process process1 = executedProcesses.get(0);
+ assertEquals("P1", process1.getProcessId());
+ assertEquals(0, process1.getWaitingTime());
+ assertEquals(10, process1.getTurnAroundTime());
+
+ LotteryScheduling.Process process2 = executedProcesses.get(1);
+ assertEquals("P2", process2.getProcessId());
+ assertEquals(10, process2.getWaitingTime());
+ assertEquals(15, process2.getTurnAroundTime());
+
+ LotteryScheduling.Process process3 = executedProcesses.get(2);
+ assertEquals("P3", process3.getProcessId());
+ assertEquals(15, process3.getWaitingTime());
+ assertEquals(23, process3.getTurnAroundTime());
+ }
+
+ private List createProcesses() {
+ LotteryScheduling.Process process1 = new LotteryScheduling.Process("P1", 10, 10); // 10 tickets
+ LotteryScheduling.Process process2 = new LotteryScheduling.Process("P2", 5, 5); // 5 tickets
+ LotteryScheduling.Process process3 = new LotteryScheduling.Process("P3", 8, 8); // 8 tickets
+
+ List processes = new ArrayList<>();
+ processes.add(process1);
+ processes.add(process2);
+ processes.add(process3);
+
+ return processes;
+ }
+}