integer overflow done

Author: Ram swaroop

src/me/ramswaroop/bits/IntegerOverflow.java

@@ -0,0 +1,58 @@
+package me.ramswaroop.bits;
+
+/**
+ * Created by IntelliJ IDEA.
+ *
+ * @author: ramswaroop
+ * @date: 6/4/15
+ * @time: 4:28 PM
+ */
+public class IntegerOverflow {
+
+    /**
+     * Adds {@param a} and {@param b} and if the result can't
+     * be stored as an integer it throws an exception
+     *
+     * @param a
+     * @param b
+     * @return
+     */
+    public static int add(int a, int b) throws Exception {
+
+        if (a > Integer.MAX_VALUE - b) {
+            throw new Exception("Integer Overflow");
+        } else {
+            return a + b;
+        }
+    }
+
+    /**
+     * Adds {@param a} and {@param b} and if the result can't
+     * be stored as an integer it throws an exception
+     *
+     * @param a
+     * @param b
+     * @return
+     */
+    public static int add_V1(int a, int b) throws Exception {
+
+        if ((a > 0 && b > 0 && a + b < 0) || (a < 0 && b < 0 && a + b > 0)) {
+            throw new Exception("Integer Overflow");
+        } else {
+            return a + b;
+        }
+    }
+
+    public static void main(String a[]) {
+        try {
+            System.out.println(add(2, 3));
+            System.out.println(add(2147483647, 999999999));
+            System.out.println(add(-2147483647, -999999999));
+            System.out.println(add_V1(2, 3));
+            System.out.println(add_V1(2147483647, 999999999));
+            System.out.println(add_V1(-2147483647, -999999999));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}