JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. public static String toString (Object [] anObjectArray); // It will return String //In order to use in program Arrays.toString (Object [] anObjectArray); The Java Arry.toString Method accepts different types of arrays as the argument to convert the array to String. Again, we are returning the string data using  StringBuilder due to this the caller method should store returning value as  StringBuilder . First, notice the return type, int, which is marked in bold before the method name (sum). // take input   Scanner scan = new Scanner(System.in); // The reverseStringData() takes StringBuffer, // object so converting string into StringBuffer, // Now, the return type is also StringBuffer, // So, create new StringBuffer class object, How to Define Method to Take and Return String Data in Java. Files.readString() – Java 11. 1) By StringBuilder / StringBuffer. We can also use String.format() method for the conversion. First, we'll return arrays and collections. How To Return An Array In Java. Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar. For converting String to StringBuilder class there is only one way, by using the StringBuilder(String) constructor. The fourth way is by using the StringBuffer class. The java string format () method returns the formatted string by given locale, format and arguments. Signature: There are two type of string format() method: The approach for the right padded Stringis very similar, so we'll only point out the differences. Given a string str consisting of digits, alphabets and special characters. Join the DZone community and get the full member experience. In implementation no different will be there. A Java method, when passed an object reference, can easily populate that object's data fields and call that object's methods. Here is an example: This method adds the two parameters passed to it, and returns the result. Over a million developers have joined DZone. Examples: Input: str = “geeksforgeeks A-118, Sector-136, Uttar Pradesh-201305” Output: 118 136 201305 Input: str = ” 1abc35de 99fgh, dd11″ Output: 1 35 99 11 Returns the length of a specified string: int: matches() Searches a string for a match against a regular expression, and returns the matches: boolean: offsetByCodePoints() Returns the index within this String that is offset from the given index by codePointOffset code points: int: regionMatches() Tests if two string … 15 Software Architecture Newsletters That Are Worth Your Subscription, Developer Return the number of characters in a string: String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; System.out.println(txt.length()); Now, lets learn about return type of a method in java. The returnANumber method can return an ImaginaryNumber but not an Object. While returning a reference to an array from a method, you should keep in mind that: The data type that returns value should be specified as the array of the appropriate … You need to run the following code to learn how to return a string using return statement − public class Program { static boolean isValid (String name, boolean exists) { // Return a boolean based on the two arguments. The format () method of java language is like sprintf () function in c language and printf () method of java … So here no actual conversion is performed. In Java, char [], String, StringBuffer, and StringBuilder are used to store, take, and return string data. You can return any primitive typ… You can override a method and define it to return a subclass of the original method, like this: How to reverse String in Java. It returns the String representation of the content. In this way, we are creating many new objects which are not actually required for our program. Please mail your requirement at hr@javatpoint.com. // The reverseStringData() takes StringBuilder, // Now, the return type is also StringBuilder, // So, create new StringBuilder class object to. The third way is by using the  StringBuilder class. The  StringBuilder class is mutable. Enter string: HelloAddress of rev: 980546781Address of rev: 980546781Address of rev: 980546781Address of rev: 980546781Address of rev: 980546781Reverse String: olleH. Java Convert boolean to String. return is a reserved keyword in Java i.e, we can’t use it as an identifier. In Java,  char[] ,  String ,  StringBuffer , and  StringBuilder are used to store, take, and return string data. We can convert boolean to String in java using String.valueOf(boolean) method.. Alternatively, we can use Boolean.toString(boolean) method which also converts boolean into String.. 1) String.valueOf() The String.valueOf() method converts boolean to String. It is used to exit from a method, with or without a value. Then, we'll show how to use container classes for complex data and learn how to create generic tuple classes. The StringBuffer class also will create the only object as StringBuilder, but we need to write extra logic for converting StringBuffer to String and String to StringBuffer. In this way, we are wasting memory. Opinions expressed by DZone contributors are their own. For big tasks, it will create so many string class objects, which actually aren't needed in the program. In this guide to Java enum with string values, learn to create enum using strings, iterate over all enum values, get enum value and to perform reverse lookup to find enum by string parameter. Among these three ways, the first ways i.e. Java return keyword is used to complete the execution of a method. From Java 8 onward, we can make use … Give feedback Q2/15 01:23 Nex Apart from all the primitive types that you can return from Java programs, you can also return references to arrays. Thus the length of the substring is endIndex-beginIndex. This return type signals that this method returns an int. We should simplify this things. Duration: 1 week to 2 week. For example, in Linux, a new line is denoted by “\n”, also called a Line Feed. Given examples use Files.readAllBytes(), Files.lines() (to read line by line) and FileReader & BufferedReader to read text file to String.. 1. Example. Java String equals(): The Java String equals() method compares the two given strings on the basis of content of the string i.e Java String representation. So, it is also not the recommended way. There are many ways to reverse String in Java. There are many ways to reverse String in Java. This value depends on the method return type like int method always return an integer value. Operating systems have special characters to denote the start of a new line. The String class is immutable. In Java, the method return type is the value returned before a method completes its execution and exits. Java program that returns boolean from method. The caller method developer needs to create a new  StringBuilder object and convert the string data to  StringBuilder just because, the called method taking argument is in  StringBuilder form not in the String form. JavaTpoint offers too many high quality services. Since toString () method simply returns the current string without any changes, there is no need to call the string explicitly, it is usually called implicitly. Syntax of method in Java If the method takes two arguments, then a String representation of the first argument in the radix specified by the second argument will be returned. In Windows, a new line is denoted using “\r\n”, sometimes called a Carriage Return and Line Feed, or CRLF.Adding a new line in Java is as simple as including “\n” or “\r” or “\r\n” at the end of our string. 7:51 Java Assessment What statement returns true if "nifty" is of type String? File: StringFormatter.java You should always create enum when you have fixed set of properties with constant values. The java.lang.String.substring(int beginIndex, int endIndex) method returns a new string that is a substring of this string. That’s why when we use this function, we can see that it’s printing the array contents and it can be used for logging purposes. Taking and returning string data using  char[]  is not a better option. Similarly, they need to create a  StringBuilder  object just because the called method is returning the string data as  StringBuilder. We can reverse String using StringBuffer, StringBuilder, iteration etc. If all the characters are matched, it returns true else it will return false. © Copyright 2011-2018 www.javatpoint.com. ImaginaryNumber is a Number because it's a subclass of Number. Finally, we'll see examples of how to use third-party libraries to return multiple values. A Java method can return a value. But the problem comes here: since we are using  StringBuilder  to take an argument,  the caller method should pass the value in the  StringBuilder  form. We can convert int to String using String.valueOf() or Integer.toString() method. In this guide, we will learn how to convert an int to string in Java. Example 1: Read a file to String in Java … For converting StringBuilder to String class object there are three ways are there:-. return name.length () >= 3 && exists; } public static void main (String [] args) { // Test the results of the isValid method. All rights reserved. The second way is by using String class. To return a string from a JavaScript function, use the return statement in JavaScript.. We should take and return the argument as a string class object. If the character oldChar does not occur in the character sequence represented by this String object, then a reference to this String object is returned. Let's see the ways to reverse String in Java. In this way, in the caller method, we don’t need to write any additional logic in the caller method. This Java program to reverse String shows that, for a small task that is for reversing “Hello” it creates five objects. Take argument as String class object => convert String class object to StringBuilder class object => process the business logic => convert the StringBuilder class object to String class object => return String class object. Let's see the ways to reverse String in Java. ", We have four ways to take and return string data:1) char[]/byte[]2) String3) StringBuilder4) StringBuffer. If you don't specify the locale in String.format () method, it uses default locale by calling Locale.getDefault () method. Convert int to String using String.valueOf() String.valueOf(int i) method takes integer value as an argument and returns a string … using the toString() method is better than the remaining two. One question that may come to your mind is, "What is the best way for defining a method to take string data and return string data in Java? However, an Object is not necessarily a Number — it could be a String or another type. We have learned what is method in java with Syntax and definition already in previous post and have learned basics about it. In the method, we should convert the String class object to the the StringBuilder  class, process the logic on the StringBuilder class, and then convert the StringBuilder class object to string class object and return it. The StringBuffer class is similar to the StringBuilder class. Implementation Note: The implementation of the string concatenation operator is left to the discretion of a Java compiler, as long as the compiler ultimately conforms to The Java™ Language Specification.For example, the javac compiler may implement the operator with StringBuffer, StringBuilder, or java… Java Arrays class provide toString (Object [] objArr) that iterates over the elements of the array and use their toString () implementation to return the String representation of the array. StringBuffer class is synchronized so it is better for a multi-thread model application, not for the single thread model application. Let's see some of the most critical points to keep in mind about returning a value from a method. String toString () is the built-in method of java.lang which return itself a string. Marketing Blog. Mail us on hr@javatpoint.com, to get more information about given services. The returnstatement determines what value is returned by the method. With the new method readString() introduced in Java 11, it takes only a single line to read a file’s content in to String.. "nifty".getType() == String "nifty".getClass().getSimpleName() "String" "nifty".getType().equals("String") "nifty" instanceof String Something wrong with this question? The  char[]  is not a better option because it works on an array. The substring begins at the specified beginIndex and extends to the character at index endIndex - 1. Are You Following These Jenkins Best Practices? It doesn’t create a new StringBuilder object, so no memory is wasted but inside the caller method we need to write some extra logics for converting the string to StringBuilder and later StringBuilder to a string. Learn to read file to string in Java. The task is to extract all the integers from the given string. In this short tutorial, we'll see how to pad a Stringin Java. We can reverse String using StringBuffer, StringBuilder, iteration etc. The return followed by the appropriate value that is returned to the caller. public class ReturnArrayExample3 { public static double [] returnArray ( ) { double [] arr = new double [3]; // Creating an array of 3 elements arr [0]=6.9; arr [1]=2.5; arr [2]=11.5; return ( x ); // Return the reference of the array } public static void main (String [] args) { double [] a; //variable to store returned array a = returnArray (); … On every modification, it creates a new object. The java string format() method returns a formatted string using the given locale, specified format string and arguments.We can concatenate the strings using this method and at the same time, we can format the output concatenated string. Second, notice the return statement. So, it is not recommended to only work with the String class. On every modification, it doesn’t create a new object, but it stores it in the same object. return keyword in Java. 1. Developed by JavaTpoint. javafx.util.Pair class in Java 8 and above. We'll focus mainly on a left pad, meaning that we'll add the leading spaces or zeros to it until it reaches the desired length. Returning anything from a method with a void return type leads to a compile error. Methods returning a value : For methods that define a return type, return statement must be immediately followed by return value. If the method takes a primitive data type as an argument, then the String object representing the primitive data type value is returned. In this tutorial, we'll learn different ways to return multiple values from a Java method.