Merge pull request #84 from Joshua-Lu/patch-2

跟新 0027.移除元素 Java版本

problems/0027.移除元素.md

@@ -126,16 +126,18 @@ Java：
 ```java
 class Solution {
     public int removeElement(int[] nums, int val) {
-        int p2 = 0;
 
-        for (int p1 = 0; p1 < nums.length; p1++) {
-            if (nums[p1] != val) {
-                nums[p2] =  nums[p1];
-                p2++;
+        // 快慢指针
+        int fastIndex = 0;
+        int slowIndex;
+        for (slowIndex = 0; fastIndex < nums.length; fastIndex++) {
+            if (nums[fastIndex] != val) {
+                nums[slowIndex] = nums[fastIndex];
+                slowIndex++;
             }
         }
+        return slowIndex;
 
-        return p2;
     }
 }
 ```