Better way to call Function multiple times

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Performance of static methods vs instance methods 3 answers

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the performance differences of the give two options is negligible. but the main difference is in the usage of the methods.

if you need a method to do any general tasks independant of class objects then you will consider static methods in your design. else for object dependant tasks you should consider the instance methods.

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You should create an object if you need some initialisation, like maybe getting values or parameters from a datasource.

The static is the way to go in your exemple as they are atomic function which return always the same result, whatever the context (stateless)

However, in C# (I don't know in java), there is a better way : Extention methods. Basicly, you will add method to the string object which will allow to call them directly on the string object, and, if yor return object is also a string, chain them if you need to :

public static string reverse(this string str)
{
    // Code to reverse your string
    return result;
}

.........

"something".reverse().addPadding()

For more info : https://msdn.microsoft.com/en-us/library/bb383977.aspx

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I believe this will be efficient

StringManipulation sm = new StringManipulation(); 
sm.reverse("something").addPadding("something").addPeriod("something");

Creating one instance which will get it worked.

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