Here is a code snippet that converts a command-line argument to an int :. All rights reserved. Hide TOC. The Platform Environment. You can use any data type for a parameter of a method or a constructor. This includes primitive data types, such as doubles, floats, and integers, as you saw in the computePayment method, and reference data types, such as objects and arrays. Here's an example of a method that accepts an array as an argument.
In this example, the method creates a new Polygon object and initializes it from an array of Point objects assume that Point is a class that represents an x, y coordinate :. You can use a construct called varargs to pass an arbitrary number of values to a method.
You use varargs when you don't know how many of a particular type of argument will be passed to the method. It's a shortcut to creating an array manually the previous method could have used varargs rather than an array. To use varargs, you follow the type of the last parameter by an ellipsis three dots, The method can then be called with any number of that parameter, including none. You can see that, inside the method, corners is treated like an array. The method can be called either with an array or with a sequence of arguments.
The code in the method body will treat the parameter as an array in either case. You will most commonly see varargs with the printing methods; for example, this printf method:. Skip to content. Change Language. Related Articles. Table of Contents. Save Article. Improve Article. And if another answer is the source of your improvement, so it goes.
At least he's honest about it and I assume he upvoted the other answers that helped him Will he's honest after I pointed it out which is fine enough. Thanks for looking. It's Varargs : The varargs short for variable-length arguments is a feature that allows the method to accept variable number of arguments zero or more. Advantages of varargs Offers a much simpler option.
Less code as no need to write overloaded methods. Restriction with varargs It is possible to have other parameters with varargs parameter in a method, however in that case, varargs parameter must be the last parameter declared by the method. Varargs method can be overloaded by - Types of its vararg parameter can be different.
This is the Java way to pass varargs variable number arguments. MichaelS MichaelS 2 2 silver badges 4 4 bronze badges. For example this is illigal: public void myMethod String Q 3, 3 3 gold badges 34 34 silver badges 37 37 bronze badges.
I am a C programmer. PhantomReference PhantomReference 1 1 gold badge 13 13 silver badges 25 25 bronze badges. Suppose we pass an Object array to the Must always give last order prefernces. Vishal Sheth Vishal Sheth 1 1 silver badge 6 6 bronze badges.
First of all its a optional parameter, coder is not bound to pass the parameter unlike other parameter other characteristics : It means zero or multiple parameter of same data type.
It must be the last parameter of the constructor or function. We can have only one of this type parameter in respective constructor or function. Shubham Jain Shubham Jain The Overflow Blog.
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