Simplify minimizing lateness (#4999)

src/main/java/com/thealgorithms/greedyalgorithms/MinimizingLateness.java

@@ -0,0 +1,43 @@
+package com.thealgorithms.greedyalgorithms;
+
+import java.util.Arrays;
+
+public class MinimizingLateness {
+
+    public static class Job {
+        String jobName;
+        int startTime = 0;
+        int lateness = 0;
+        int processingTime;
+        int deadline;
+
+        public Job(String jobName, int processingTime, int deadline) {
+            this.jobName = jobName;
+            this.processingTime = processingTime;
+            this.deadline = deadline;
+        }
+
+        public static Job of(String jobName, int processingTime, int deadline) {
+            return new Job(jobName, processingTime, deadline);
+        }
+
+        @Override
+        public String toString() {
+            return String.format("%s, startTime: %d, endTime: %d, lateness: %d", jobName, startTime, processingTime + startTime, lateness);
+        }
+    }
+
+    static void calculateLateness(Job... jobs) {
+
+        // sort the jobs based on their deadline
+        Arrays.sort(jobs, (a, b) -> a.deadline - b.deadline);
+
+        int startTime = 0;
+
+        for (Job job : jobs) {
+            job.startTime = startTime;
+            startTime += job.processingTime;
+            job.lateness = Math.max(0, startTime - job.deadline); // if the job finishes before deadline the lateness is 0
+        }
+    }
+}

src/main/java/com/thealgorithms/minimizinglateness/MinimizingLateness.java

@@ -1,55 +0,0 @@
-package com.thealgorithms.minimizinglateness;
-
-import java.io.BufferedReader;
-import java.io.FileReader;
-import java.io.IOException;
-import java.util.StringTokenizer;
-
-public class MinimizingLateness {
-
-    private static class Schedule { // Schedule class
-
-        int t = 0; // Time required for the operation to be performed
-        int d = 0; // Time the job should be completed
-        public Schedule(int t, int d) {
-            this.t = t;
-            this.d = d;
-        }
-    }
-
-    public static void main(String[] args) throws IOException {
-        StringTokenizer token;
-
-        BufferedReader in = new BufferedReader(new FileReader("MinimizingLateness/lateness_data.txt"));
-        String ch = in.readLine();
-        if (ch == null || ch.isEmpty()) {
-            in.close();
-            return;
-        }
-        int indexCount = Integer.parseInt(ch);
-        System.out.println("Input Data : ");
-        System.out.println(indexCount); // number of operations
-        Schedule[] array = new Schedule[indexCount]; // Create an array to hold the operation
-        int i = 0;
-        while ((ch = in.readLine()) != null) {
-            token = new StringTokenizer(ch, " ");
-            // Include the time required for the operation to be performed in the array and the time
-            // it should be completed.
-            array[i] = new Schedule(Integer.parseInt(token.nextToken()), Integer.parseInt(token.nextToken()));
-            i++;
-            System.out.println(array[i - 1].t + " " + array[i - 1].d);
-        }
-
-        int tryTime = 0; // Total time worked
-        int lateness = 0; // Lateness
-        for (int j = 0; j < indexCount - 1; j++) {
-            tryTime = tryTime + array[j].t; // Add total work time
-            // Lateness
-            lateness = lateness + Math.max(0, tryTime - array[j].d);
-        }
-        System.out.println();
-        System.out.println("Output Data : ");
-        System.out.println(lateness);
-        in.close();
-    }
-}

src/main/java/com/thealgorithms/minimizinglateness/lateness_data.txt

@@ -1,7 +0,0 @@
-6
-3 6
-2 8
-1 9
-4 9
-3 14
-2 15

src/test/java/com/thealgorithms/greedyalgorithms/MinimizingLatenessTest.java

@@ -0,0 +1,43 @@
+package com.thealgorithms.greedyalgorithms;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import com.thealgorithms.greedyalgorithms.MinimizingLateness.Job;
+import org.junit.jupiter.api.Test;
+
+public class MinimizingLatenessTest {
+
+    @Test
+    void testCalculateLateness() {
+        // Test case with three jobs
+        Job job1 = new Job("Job1", 4, 6);
+        Job job2 = new Job("Job2", 2, 8);
+        Job job3 = new Job("Job3", 1, 9);
+        Job job4 = new Job("Job4", 5, 9);
+        Job job5 = new Job("Job5", 4, 10);
+        Job job6 = new Job("Job6", 3, 5);
+
+        MinimizingLateness.calculateLateness(job1, job2, job3, job4, job5, job6);
+
+        // Check lateness for each job
+        assertEquals(6, job4.lateness);
+        assertEquals(0, job6.lateness);
+        assertEquals(1, job2.lateness);
+    }
+
+    @Test
+    void testCheckStartTime() {
+
+        Job job1 = new Job("Job1", 2, 5);
+        Job job2 = new Job("Job2", 1, 7);
+        Job job3 = new Job("Job3", 3, 8);
+        Job job4 = new Job("Job4", 2, 4);
+        Job job5 = new Job("Job5", 4, 10);
+
+        MinimizingLateness.calculateLateness(job1, job2, job3, job4, job5);
+
+        assertEquals(2, job1.startTime);
+        assertEquals(5, job3.startTime);
+        assertEquals(8, job5.startTime);
+    }
+}