It maintains the chain between the constructors i.e. This is used to refer the constructors public JavaQuestions(String javapapers) ģ. The this() constructor call should be used to reuse the constructor from the constructor. If the local variable that is parameter’s name is not same as instance variable then irrespective of this is used or not it denotes the instance variable. There cannot be any return statement in the constructor. When a constructor is declared without any parameter or argument, then it is called a parameter-less constructor.

There cannot be any return type in the constructor definition. The constructor name MUST be the same as the name of the class. Therefore the absence of the this denotes the local variable. There are a few mandatory rules for creating the constructors in Java. The below table shows the point-to-point difference between both this keyword and this (). this () is used to call one constructor from the other of the same class.

this keyword is used to refer to the current object, i.e. The this keyword refers to the current object in a method or constructor. Exception in thread main : Unresolved compilation problem: Constructor call must be the first statement in a constructor. The real purpose of Constructor Chaining is that you. Here the precedence is high for the local variable. In Java, both this and this () are completely different from each other. Calling a constructor from the another constructor of same class is known as Constructor chaining. Here this refers to the instance variable. JetBrains released IntelliJ IDEA 2024. To specifically denote that the instance variable is used instead of static or local variable. The following is a copy & paste from here, but explains very well all different uses of the this keyword:ĭefinition: Java’s this keyword is used to refer the current instance of the method on which it is used.

This java constructor