Here is the syntax for declaring an array variable − The Apache Commons Lang offers class ArrayUtils that comprises of overloaded reverse() methods for the cause of reversing int, float as well as object type arrays in Java. Reverse array in Java can be appropriately implemented in line with the above three methods. The API provides easy-to-use overloaded methods for reversing different types of arrays in Java – be it int, log, double, float or object arrays.There are many methods to reverse an array in Java. for the specified value using the binary search algorithm. This returns true if the two arrays are equal. ArrayList arrL = new ArrayList(); Here Type is the type of elements in ArrayList to be created Alternatively, in the case of Maven is being used then the following dependency has to be included in the pom.xml file.At the very onset, values have to be provided to the array that needs to be reversed in Java.Next, the loop counter has to be initialized. To implement array reverse in Java Programming, the array size and thereafter the array elements have to be entered by the user. In another method of array reverse in Java, an array can be converted into an ArrayList, after which a specific code can be used for reversing the ArrayList.
Reverse Array in Place. The same method could be used by all other primitive data types ( Byte, short, Int, etc.) This method provides an ideal solution for interviewees as the remaining two methods are apt for practical purposes.This particular method of array reverse in Java converts the given array into an ArrayList and then utilizes the Collections.reverse() method that takes up the items in the list and reverses the elements in linear time. For example, the following method displays the elements in an You can invoke it by passing an array. In case you have to answer an interview question pertaining to a java program to reverse an array then use the in-place algorithm. This returns index of the search key, if it is contained in the list; otherwise, it returns ( – (insertion point + 1)).Returns true if the two specified arrays of longs are equal to one another. You may consider writing a function on your own that loops across the array and keep swapping all the elements until the full array is sorted. This particular method reverses any given array in its place; in other words, a new array is not created for the purposes of array reverse in the Java code.The ArrayUtils class belongs to Apache Commons Lang.

For example, the following method returns an array that is the reversal of another array −The java.util.Arrays class contains various static methods for sorting and searching arrays, comparing arrays, and filling array elements. In the next step, the array elements are swapped. Yet another method of array reverse in Java comprises of using the Apache Commons ArrayUtils.reverse() program for the sake of reversing any kind of Java array. This interesting class is used in association with the java.util.Arrays class for playing with object and primitive arrays in Java. The loop can be defined as:The above-mentioned methods go a long way in helping coders reverse int & String array in Java. As no additional buffers are used, this method of reversing an array in Java is also referred to as an array in-place.The time complexity of the above algorithm is O(n/2). )Assigns the specified int value to each element of the specified array of ints. The array must be sorted prior to making this call. These methods are overloaded for all primitive types.Searches the specified array of Object ( Byte, Int , double, etc.) Arrays of int, string or other types can be reversed with the help of this method.The following example depicts a reversal of a string type array in Java:As is evident from the output provided above, the original order of elements has been reversed in the final array as returned by the toArray() method of the List class.Apache commons refers is a collection of numerous utility libraries used for effective Java development. Here is the syntax for declaring an array variable −The following code snippets are examples of this syntax −You can create an array by using the new operator with the following syntax −It assigns the reference of the newly created array to the variable arrayRefVar.Declaring an array variable, creating an array, and assigning the reference of the array to the variable can be combined in one statement, as shown below −Following statement declares an array variable, myList, creates an array of 10 elements of double type and assigns its reference to myList −Following picture represents array myList.