Since Java does not have the concept of methods as first-class entities, this is only possible using reflection, which is painful and error-prone. The best approximation would probably be to have the levels as enums with a per-instance implementation of a method:

Nov 9, 2011 · This code creates a stream over the indexes of the array with IntStream.range, filters the indexes to keep only those where the array's element at that index is equal to the value searched and finally keeps the first one matched with findFirst. findFirst returns an OptionalInt, as it is possible that no matching indexes were found.

Updated answer for Java 8 and onwards-Since the introduction of lambda expressions and method references in Java 8, storing various methods in variables is now possible. One main issue is that arrays don't currently support generic objects in Java, which makes storing the methods in arrays less

Nov 13, 2013 · It's not possible add an eleventh integer, without re-assign the reference to a new array, like the following: int[] i = new int[11]; In Java the package java.util contains all kinds of data structures that can handle adding and removing items from array-like collections. The classic data structure Stack has methods for push and pop.

Mar 13, 2015 · Pass the array to a method that sorts it with Arrays.sort() so it only sorts the array the method is using then sets min to array[0] and max to array[array.length-1]. Share Improve this answer

Jul 29, 2009 · You can either use array declaration or array literal (but only when you declare and affect the variable right away, array literals cannot be used for re-assigning an array). For primitive types: int[] myIntArray = new int[3]; // each element of the array is initialised to 0 int[] myIntArray = {1, 2, 3}; int[] myIntArray = new int[]{1, 2, 3 ...

Oct 20, 2011 · Java arrays have a fixed length. So indeed, what you want to do is impossible. You might make the method return an int[] array, but it would be a whole new array, containing all the elements of the initial one + the amount passed as argument. If you want to add something to an array-like structure, use an ArrayList<Integer>.

Nov 25, 2012 · If you need a process wide access to your array from many various class instances you may wrap it within singleton class. If you need to access array within only one object where "callArray" and "anotherMethod" methods is implemented you can simply declare array as a class field:

Apr 6, 2011 · java.util.Arrays only exposes static methods, so you simply pass in your array and whatever other params are necessary for the particular method you are calling. For instance Arrays.fill(myarray,true) would fill a boolean array with the value true. Here is …

Jan 9, 2020 · The equals() of arrays is inherited from Object, so it does not look at the contents of the arrrays, it only considers each array equal to itself. The Arrays.equals() methods do compare the arrays' contents. There's overloads for all primitive types, and the one for objects uses the objects' own equals() methods.