The toString() method returns the string representation of the object. If you print any object, java compiler internally invokes the toString() method on the object. So overriding the toString() method, returns the desired output, it can be the state of an object etc. depends on your implementation.
The main purpose of toString is to generate a String representation of an object, means the return value is always a String. In most cases this simply is the object’s class and package name, but on some cases like StringBuilder you will got actually a String-text.
One may also ask, what is public string toString in Java? String toString() is the built-in method of java. lang which return itself a string. So here no actual conversion is performed. 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.
Then, what does toString method do?
The toString method is used to return a string representation of an object. If any object is printed, the toString() method is internally invoked by the java compiler. Else, the user implemented or overridden toString() method is called.
What type of method is toString ()?
Object toString() Method in Java Every class in java is child of Object class either directly or indirectly. Object class contains toString() method. We can use toString() method to get string representation of an object. Whenever we try to print the Object reference then internally toString() method is invoked.
How do I override toString?
To override the ToString method in your class or struct: Declare a ToString method with the following modifiers and return type: C# Copy. Implement the method so that it returns a string. The following example returns the name of the class in addition to the data specific to a particular instance of the class.
Is toString a static method?
Every object type has a method called toString that returns a string representation of the object. The definition does not have the keyword static , because it is not a static method. It is an instance method, so called because when you invoke it, you invoke it on an instance of the class ( Time in this case).
Can we override toString method in Java?
Overriding toString() in Java The default toString() method in Object prints “class name @ hash code”. We can override toString() method in our class to print proper output. In general, it is a good idea to override toString() as we get get proper output when an object is used in print() or println().
How do I override Hashcode?
Overriding hashCode method in Java Take a prime hash e.g. 5, 7, 17 or 31 (prime number as hash, results in distinct hashcode for distinct object) Take another prime as multiplier different than hash is good. Compute hashcode for each member and add them into final hash. Return hash.
How do I toString an array?
Arrays. toString(int) method returns a string representation of the contents of the specified int array. The string representation consists of a list of the array’s elements, enclosed in square brackets (“”). Adjacent elements are separated by the characters “, ” (a comma followed by a space).
What would happen if you will not override the toString () method?
When you need to do that, you must override the toString() method implemented in the Object class (the base class of all objects). If you do not do that, when you will try to print your object ( System. out.
How do you convert an object to a string in Java?
We can convert Object to String in java using toString() method of Object class or String. valueOf(object) method. You can convert any object to String in java whether it is user-defined class, StringBuilder, StringBuffer or anything else.
What does this mean in Java?
Keyword THIS is a reference variable in Java that refers to the current object. It can be used to refer instance variable of current class. It can be used to invoke or initiate current class constructor. It can be passed as an argument in the method call.
How do you use the toString method?
Java – toString() Method If the method takes a primitive data type as an argument, then the String object representing the primitive data type value is returned. 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.
What happens when you print an object in Java?
Prints an Object and then terminate the line. This method calls at first String. valueOf(x) to get the printed object’s string value, then behaves as though it invokes print(String) and then println(). In general, the toString method returns a string that “textually represents” this object.
What is toString method in C#?
ToString() Method in C# with examples. ToString method is inherited from the Object class which is used to get a string that represents the current object. It can also apply on the Stack. It returns a string which represents the current stack object.
How do you write a toString method in Java?
Use StringBuilder to generate toString output If you writing code for toString() method in Java, then use StringBuilder to append individual attribute. If you are using IDE like Eclipse, Netbeans or IntelliJ then also using StringBuilder and append() method instead of + operator to generate toString method is good way.
What is the use of equals method in Java?
Equals() method is defined in Object class in Java and used for checking equality of two objects defined by business logic e.g. two Employees are considered equal if they have same empId etc.
Why is string immutable in Java?
The string is Immutable in Java because String objects are cached in String pool. Another reason of why String class is immutable could die due to HashMap. Since Strings are very popular as HashMap key, it’s important for them to be immutable so that they can retrieve the value object which was stored in HashMap.