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It's truly useful for testing and demo purpose, but I have also used this to create an ArrayList of an initial set of fixed values. You can use this technique to declare an ArrayList of integers, String, or any other object. That's all about how to declare an ArrayList with values in Java.
#MAKE A LIST IN JAVA CODE#
Here is a nice summary of code examples of how to make an ArrayList of values in Java: You cannot add or remove elements into this list but when you create an ArrayList like new ArrayList(Arrays.asList()), you get a regular ArrayList object, which allows you to add, remove and set values. This is Ok to print values, but it's not an ArrayList. Some programmer's also like to declare a List with values in one line as: asList(3.14f, 6.28f, 9.56f)) ĭon't forget the suffix 'f', it's important because by default floating-point numbers are double in Java. Similarly here is how you should create ArrayList with float values:ĪrrayList floats = new ArrayList( Arrays. You can do the same to create an ArrayList with String objects as well, e.g.Īrrays. This is how you declare an ArrayList of Integer values. Here is a code example to show you how to initialize ArrayList at the time of declaration:ĪrrayList numbers = new ArrayList( Arrays. String, integers, floats, or doubles by using the Arrays.asList() method, which is nothing but a shortcut to convert an Array to ArrayList. But don't worry, there is a workaround to declare an ArrayList with values e.g. String names = īut unfortunately, ArrayList doesn't support such kind of declaration in Java. Sometimes you want to create an ArrayList with values, just like you initialize t at the time of declaration, as shown below: