Java program to Reverse a String using ListIterator It also helps iterate through the reversed list and printing each object to the output screen one-by-one.Īlso Read: What is Java API, its Advantages and Need for it Code To iterate over the array, use the ListIterator object. Then, using the listIterator() method on the ArrayList object, construct a ListIterator object. Since the reverse() method of the Collections class takes a list object, use the ArrayList object, which is a list of characters, to reverse the list.Ĭopy the String contents to an ArrayList object in the code below. The Collections class in Java also has a built-in reverse() function. Then, in the ArrayList object, add the array's characters. Using the built-in method toCharArray(), convert the input string into a character array. ( "Reversed String : " +new String(resultoutput)) Store result in reverse order into theįor (int i = 0 i < strAsByteArray.length i++) getBytes() is inbuilt method to convert stringīyte strAsByteArray = inputvalue.getBytes() īyte resultoutput = new byte There are two byte arrays created, one to store the converted bytes and the other to store the result in the reverse order. The getBytes() is also an in-built method to convert the string into bytes. In the code below, a byte array is temporarily created to handle the string. Get the bytes in reverse order and store them in another byte array. The temporary byte array length will be equal to the length of the given string. The getBytes() method will split or convert the given string into bytes. The StringBuilder and StringBuffer classes are two utility classes in java that handle resource sharing of string manipulations. In Java, it will create new string objects when you handle string manipulation since the String class is immutable. To achieve the desired output, the reverse() method will help you. These StringBuilder and StringBuffer classes create a mutable sequence of characters. The StringBuilder class is faster and not synchronized. Although, StringBuilder class is majorly appreciated and preferred when compared to StringBuffer class. Considering reverse, both have the same kind of approach. Both the StringBuilder class and StringBuffer class, work in the same way to reverse a string in Java. ( "Reversed String : " +stringBuildervarible) Īlternatively, you can also use the StringBuffer class reverse() method similar to the StringBuilder. reverse is inbuilt method in StringBuilder to use reverse the string append is inbuilt method to append the data append a string into StringBuilder stringBuildervarible StringBuilder stringBuildervarible = new StringBuilder() This is a preferred method and commonly used to reverse a string in Java. The object calls the in-built reverse() method to get your desired output. But it also considers these objects as not thread-safe. The StringBuilder objects are mutable, memory efficient, and quick in execution. In the code mentioned below, the object for the StringBuilder class is used. The reverse method is the static method that has the logic to reverse a string in Java. This method replaces the sequence of the characters in reverse order. StringBuilder or StringBuffer class has an in-build method reverse() to reverse the characters in the string. Let us see how to reverse a string using the StringBuilder class. CodeĬhar resultarray = stringinput.toCharArray() įor (int i = resultarray.length - 1 i >= 0 i-) The for loop iterates till the end of the string index zero. The code also uses the length, which gives the total length of the string variable. By using toCharArray() method is one approach to reverse a string in Java. The code below will help you understand how to reverse a string. It has a toCharArray() method to do the reverse. The string class doesn't have a reverse method to reverse the string. Since the strings are immutable objects, you need to create another string to reverse them. Example: HELLO string reverse and give the output as OLLEH How to Reverse a String in Java?
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