add main.java

src/main/java/Main.java

+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+    public static void main(String[] args) throws InterruptedException {
+
+        int rangeStart = 1;
+        int rangeEnd = 100_000_000;
+        int threadsNumber = 4;
+        int partialRange = (rangeEnd-rangeStart)/threadsNumber;
+        List<PrimeNumberGenerator> primeNumberGeneratorList = new ArrayList<PrimeNumberGenerator>();
+        List<Thread> threadList = new ArrayList<Thread>();
+        List<Integer> primeNumbers = new ArrayList<Integer>();
+
+        for(int i = 0 ; i<threadsNumber ; i++){
+            int partialRangeStart = rangeStart + partialRange* i;
+            int partialRangeEnd = partialRangeStart + partialRange - 1;
+            PrimeNumberGenerator primeNumberGenerator = new PrimeNumberGenerator(partialRangeStart,partialRangeEnd);
+            Thread thread = new Thread(primeNumberGenerator);
+            threadList.add(thread);
+            primeNumberGeneratorList.add(primeNumberGenerator);
+            thread.start();
+        }
+        long startTime = System.currentTimeMillis();
+
+        for (Thread thread : threadList) {
+            thread.join();
+        }
+
+        long endTime = System.currentTimeMillis();
+
+        for (PrimeNumberGenerator primeNumberGenerator : primeNumberGeneratorList) {
+            primeNumbers.addAll(primeNumberGenerator.getGeneratedPrimeNumbers());
+        }
+
+        System.out.println("Number of prime numbers found: " + primeNumbers.size());
+        System.out.println("Execution time: " + (endTime - startTime) + " milliseconds");
+    }
+}

src/main/java/PrimeNumberGenerator.java

+import java.util.ArrayList;
+import java.util.List;
+
+public class PrimeNumberGenerator implements Runnable{
+
+    public PrimeNumberGenerator(int rangeStart, int rangeEnd) {
+        this.setRangeStart(rangeStart);
+        this.setRangeEnd(rangeEnd);
+        generatedPrimeNumbers = new ArrayList<Integer>();
+    }
+
+    public PrimeNumberGenerator() {
+
+    }
+
+    public int getRangeStart() {
+        return rangeStart;
+    }
+
+    public int getRangeEnd() {
+        return rangeEnd;
+    }
+
+    public void setRangeStart(int rangeStart) {
+        this.rangeStart = rangeStart;
+    }
+
+    public void setRangeEnd(int rangeEnd) {
+        this.rangeEnd = rangeEnd;
+    }
+
+    public List<Integer> getGeneratedPrimeNumbers() {
+        return generatedPrimeNumbers;
+    }
+
+    public boolean checkPrime(int number){
+        if(number <= 1) return false;
+        else if (number == 2) return true;
+        else{
+            for(int i = 2 ; i <= Math.sqrt(number) ; i++){
+                if(number % i == 0){
+                    return false;
+                }
+            }
+            return true;
+        }
+    }
+
+    private int rangeStart;
+    private int rangeEnd;
+    private List<Integer> generatedPrimeNumbers;
+
+
+    @Override
+    public void run() {
+        int i = this.getRangeStart();
+        for( ; i < this.getRangeEnd() ; i++){
+            if(this.checkPrime(i)) generatedPrimeNumbers.add(i);
+        }
+    }
+}

src/test/java/PrimeNumberGeneratorTest.java

+import junit.framework.TestCase;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+public class PrimeNumberGeneratorTest extends TestCase {
+
+    @Test
+    public void testcheckPrime() {
+        PrimeNumberGenerator primeNumberGenerator = new PrimeNumberGenerator();
+        assertTrue(primeNumberGenerator.checkPrime(23));
+    }
+}
\ No newline at end of file