Added exercise sieve

config.json

@@ -28,7 +28,8 @@
     "accumulate",
     "crypto-square",
     "trinary",
-    "rna-transcription"
+    "rna-transcription",
+    "sieve"
   ],
   "deprecated": [
   ],

sieve/build.gradle

@@ -0,0 +1,11 @@
+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.10"
+}

sieve/example.java

@@ -0,0 +1,37 @@
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class Sieve {
+
+    private int maximalPrime;
+    private List<Integer> primes;
+
+    public Sieve(int maximalPrime) {
+        this.maximalPrime = maximalPrime;
+        this.primes = calculatePrimes();
+    }
+
+    public List<Integer> getPrimes() {
+        return primes;
+    }
+
+    private List<Integer> calculatePrimes() {
+        List<Integer> primes = new ArrayList<>();
+        LinkedList<Integer> candidates = IntStream.range(2, maximalPrime + 1)
+                .boxed()
+                .collect(Collectors.toCollection(LinkedList::new));
+
+        while (candidates.size() > 0) {
+            Integer prime = candidates.remove();
+            primes.add(prime);
+            candidates = candidates.stream()
+                    .filter(x -> x % prime != 0)
+                    .collect(Collectors.toCollection(LinkedList::new));
+        }
+
+        return primes;
+    }
+}

sieve/src/main/java/Sieve.java

@@ -0,0 +1,2 @@
+public class Sieve {
+}

sieve/src/test/java/SieveTest.java

@@ -0,0 +1,41 @@
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class SieveTest {
+
+    @Test
+    public void findFirstPrime() {
+        Sieve sieve = new Sieve(2);
+        List<Integer> expectedOutput = Arrays.asList(new Integer[]{2});
+
+        assertEquals(expectedOutput, sieve.getPrimes());
+    }
+
+    @Test
+    public void findPrimesUpTo10() {
+        Sieve sieve = new Sieve(10);
+        List<Integer> expectedOutput = Arrays.asList(2, 3, 5, 7);
+
+        assertEquals(expectedOutput, sieve.getPrimes());
+    }
+
+    @Test
+    public void findPrimesUpTo1000() {
+        Sieve sieve = new Sieve(1000);
+        List<Integer> expectedOutput = Arrays.asList(2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61,
+                67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173,
+                179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283,
+                293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421,
+                431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563,
+                569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683,
+                691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829,
+                839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983,
+                991, 997);
+
+        assertEquals(expectedOutput, sieve.getPrimes());
+    }
+}