We can also easily modify code using methods. Similarly, the method in Java is a collection of instructions that performs a specific task. From inside two parameters constructor, the statement this() will call non-parameterized constructor.In general, a method is a way to perform some task. Now, the control of execution is transferred to two parameters constructor.ģ. From inside one parameter constructor, the statement this(“Java”, 1995) will call two parameters constructor. The Java compiler is written in Java but Java runtime in ANSI C.Ģ. James Gosling is known as Father of Java programming language. Call display method using object reference variable obj. Create an object of class Developed using the new keyword and passes the int value.ĭeveloped obj = new Developed(1995) // It will call one parameter constructor. ("The Java compiler is written in Java but Java runtime in ANSI C.") ("at Sun Microsystem and released in 1995") This() // It will call default constructor due to no parameter in this() keyword. Declaration of this keyword without the parameter. ("James Gosling is known as Father of Java programming language.") This("Java", 1995) // It will call two parameters constructor within the same class. Declaration of this keyword with two parameters list. Creating one paramterized constructor. Creating non-parameterized constructor. Program code 1: package constructorProgram Look at the program source code and follows all steps explained in the coding. We will call the current class constructor using this keyword. Let’s take an example program where we will create constructor chaining. Java Constructor chaining can be done in any order. There must be at least one constructor without this keyword.Ĥ. Otherwise java compiler will generate this error message: Exception in thread “main” : Unresolved compilation problem: Constructor call must be the first statement in the constructor.ģ. this() keyword must be in the first line of the constructor to call the same or current class constructor. We must use this () keyword to call the current class constructor because Java compiler never puts automatically this() keyword like a super() keyword.Ģ.
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