refactor 640

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_640.java

@@ -34,35 +34,37 @@
 
  */
 public class _640 {
-    /**
-     * Reference: https://discuss.leetcode.com/topic/95203/concise-java-solution/7
-     */
-    public String solveEquation(String equation) {
-        String[] parts = equation.split("=");
-        int[] left = evaluate(parts[0]);
-        int[] right = evaluate(parts[1]);
-        if (left[0] == right[0] && left[1] == right[1]) {
-            return "Infinite solutions";
-        } else if (left[0] == right[0]) {
-            return "No solution";
+    public static class Solution1 {
+        /**
+         * Reference: https://discuss.leetcode.com/topic/95203/concise-java-solution/7
+         */
+        public String solveEquation(String equation) {
+            String[] parts = equation.split("=");
+            int[] left = evaluate(parts[0]);
+            int[] right = evaluate(parts[1]);
+            if (left[0] == right[0] && left[1] == right[1]) {
+                return "Infinite solutions";
+            } else if (left[0] == right[0]) {
+                return "No solution";
+            }
+            return "x=" + (right[1] - left[1]) / (left[0] - right[0]);
         }
-        return "x=" + (right[1] - left[1]) / (left[0] - right[0]);
-    }
 
-    private int[] evaluate(String part) {
-        int[] result = new int[2];//result[0] is the coefficient for x, result[1] is the coefficient for constants
-        String[] tokens = part.split("(?=[+-])");  // ()for match group; ?= for match and include in res; [+-] means + or -;
-        for (String token : tokens) {
-            if (token.equals("+x") || token.equals("x")) {
-                result[0]++;
-            } else if (token.equals("-x")) {
-                result[0]--;
-            } else if (token.contains("x")) {
-                result[0] += Integer.parseInt(token.substring(0, token.length() - 1));
-            } else {
-                result[1] += Integer.parseInt(token);
+        private int[] evaluate(String part) {
+            int[] result = new int[2];//result[0] is the coefficient for x, result[1] is the coefficient for constants
+            String[] tokens = part.split("(?=[+-])");  // ()for match group; ?= for match and include in res; [+-] means + or -;
+            for (String token : tokens) {
+                if (token.equals("+x") || token.equals("x")) {
+                    result[0]++;
+                } else if (token.equals("-x")) {
+                    result[0]--;
+                } else if (token.contains("x")) {
+                    result[0] += Integer.parseInt(token.substring(0, token.length() - 1));
+                } else {
+                    result[1] += Integer.parseInt(token);
+                }
             }
+            return result;
         }
-        return result;
     }
 }