Create README.md

Author: javaiskool

README.md

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+# codejava
+core java code
+One.java and BuySell java are two of the interview questions asked in PayTm interview.
+One.java
+the string "5+6*7-60" should be reversed in "60-7*6+5"
+========
+
+BuySell.java
+===================
+The cost of a stock on each day is given in an array, find the max profit that you can make by buying and selling in those days.
+For example, if the given array is {100,180,260,310,40,535,695} the maximum profit can earned by buying on day 0, selling on day 3. 
+Again buy on day 4 and sell on day 6. If the given array of prices is sorted in decreasing order, then profit cannot be earned at 
+all.