Add Solution for Summation of primes Problem (#115)

* Create Solution.java

* Create Test.java

* Create Readme.md

javaProblems/problem17/Readme.md

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+# Summation of Primes Problem Statement
+
+## Problem Description
+
+Find the sum of all the prime numbers below a given integer.
+
+The sum of the primes below `10` is `2 + 3 + 5 + 7 = 17.`
+
+### Input Format
+
+The program should take a single integer as input:
+
+```
+N
+```
+
+### Output Format
+
+The program should output a single integer:
+
+```
+SUM
+```
+
+## Constraints
+- `10` ≤ `N` ≤ `2,000,000`
+
+## Example
+
+### Input
+```
+10
+```
+
+### Output
+```
+17
+```
+
+## Notes
+
+- The sum of all the prime numbers below 10 is 17.

javaProblems/problem17/Solution.java

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+public class Solution {
+    public long sumPrimes(int n) {
+        boolean[] isPrime = new boolean[n];
+        for (int i = 2; i < n; i++) {
+            isPrime[i] = true;
+        }
+
+        for (int i = 2; i*i < n; i++) {
+            if (isPrime[i]) {
+                for (int j = i*i; j < n; j += i) {
+                    isPrime[j] = false;
+                }
+            }
+        }
+
+        long sum = 0;
+        for (int i = 2; i < n; i++) {
+            if (isPrime[i]) {
+                sum += i;
+            }
+        }
+        return sum;
+    }
+}

javaProblems/problem17/Test.java

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+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class Test {
+    public static void main(String[] args) {
+        Logger logger = Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);
+        Solution solution = new Solution();
+        long result;
+
+        // Test 1
+        try {
+            result = solution.sumPrimes(10);
+        } catch (Exception e) {
+            logger.log(Level.SEVERE, "Runtime error");
+            System.exit(1);
+            throw new Error("Runtime Error");
+        }
+        if (result != 17) {
+            logger.log(Level.SEVERE, "Wrong solution! Expected: 17, Got: " + result);
+            System.exit(1);
+        }
+
+        // Test 2
+        try {
+            result = solution.sumPrimes(20);
+        } catch (Exception e) {
+            logger.log(Level.SEVERE, "Runtime error");
+            System.exit(1);
+            throw new Error("Runtime Error");
+        }
+        if (result != 77) {
+            logger.log(Level.SEVERE, "Wrong solution! Expected: 77, Got: " + result);
+            System.exit(1);
+        }
+
+        // Test 3
+        try {
+            result = solution.sumPrimes(30);
+        } catch (Exception e) {
+            logger.log(Level.SEVERE, "Runtime error");
+            System.exit(1);
+            throw new Error("Runtime Error");
+        }
+        if (result != 129) {
+            logger.log(Level.SEVERE, "Wrong solution! Expected: 129, Got: " + result);
+            System.exit(1);
+        }
+
+        System.out.print("All test cases passed!");
+    }
+}