The class has one property isOn (defined in same way as variable), and two member functions turnOn() and turnOff(). To define a class in Kotlin, class keyword is used: Since, many houses can be made from the same description, we can create many objects from a class. Based on these descriptions we build the house. It contains all the details about the floors, doors, windows etc. We can think of class as a sketch (prototype) of a house. This article will focus on the basics to keep things simple.īefore you create objects in Kotlin, you need to define a class. You will learn about detail features of an object-oriented programming like: data encapsulation, inheritance and polymorphism as we go on. It has braking, accelerating, changing gears etc.It has current gear, two wheels, number of gear etc.You can turn on and turn off lamp (behavior).
In object-oriented style of programming, you can divide a complex problem into smaller sets by creating objects. This article will focus on object-oriented style of programming in Kotlin. You will learn about these concept in later chapters. Kotlin supports features such as higher-order functions, function types and lambdas which makes it a great choice for working in functional programming style. In this Kotlin Tutorial, we learned how to read a floating point value from console input using readLine() function and String.toFloat() method.Kotlin supports both functional and object-oriented programming. When we entered an invalid value for a float, parsing failed and NumberFormatException is thrown. We then print the entered value back to console.Įxception in thread "main" : For input string: "3.14asdf"Īt java.base/.readJavaFormatString(FloatingDecimal.java:2054)Īt java.base/.parseFloat(FloatingDecimal.java:122)Īt java.base/(Float.java:455) In the following program, we read a floating point number to n from user input. Please note that we have used safe call ?. Once we got the string value, we convert it to a floating point value using String.toFloat() method, as shown in the following. Please note that the function can also return a null value. The syntax to call readLine() function is readLine()
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