Update 0343.整数拆分.md Java版本增加贪心算法，清晰注释

problems/0343.整数拆分.md

@@ -243,6 +243,29 @@ class Solution {
     }
 }
 ```
+贪心
+```Java
+class Solution {
+    public int integerBreak(int n) {
+        // with 贪心
+        // 通过数学原理拆出更多的3乘积越大，则
+        /**
+         @Param: an int, the integer we need to break.
+         @Return: an int, the maximum integer after breaking
+         @Method: Using math principle to solve this problem
+         @Time complexity: O(1)
+        **/
+        if(n == 2) return 1;
+        if(n == 3) return 2;
+        int result = 1;
+        while(n > 4) {
+            n-=3;
+            result *=3;
+        }
+        return result*n;
+    }
+}
+```
 
 ### Python
 动态规划（版本一）