We use the enum keyword to declare enums. For example, enum Size { SMALL, MEDIUM, LARGE, EXTRALARGE } Here, we have created an enum named Size. It contains fixed values SMALL, MEDIUM, LARGE, and EXTRALARGE. These values inside the braces are called enum constants (values). Note: The...
// Java program to create an enum // inside the class public class Main { enum Vehicle { BIKE, CAR, BUS } public static void main(String[] args) { Vehicle car = Vehicle.CAR; System.out.println("Vehicle is: " + car); } } ...
We can declare the main() method inside the enum. Hence we can invoke enum directly from the Command Prompt. Java // A Java program to demonstrate that we can have // main() inside enum class. enum Color { RED, GREEN, BLUE; // Driver method public static void main(String[] args...
We have seen class inside another class, further, we can declare a class within an interface. If the functionality of class is closely associated with interface functionality, we can declare it inside the interface. We can go for this inner class when we want to write the default implementatio...
enum MyEnum {} // Error unable to declare member level enum. } } I assume, that it is because of the fact that Enum in java is implicitly static. But still, while you can have a "static instance variable" inside an inner class, why can't you declare an "static memeber class". ...
publicclassDay {/*** Constructor*/publicDay() {//Illegal. Compilation errorenumSeason { WINTER, SPRING, SUMMER, FALL } }publicvoidaSimpleMethod() {//Legal. You can declare a primitive (or an Object) inside a method. Compile!intprimitiveInt = 42;//Illegal. Compilation error.enumSeason {...
{ } DECLARE_REGISTRY_RESOURCEID(IDR_MYCLASS) DECLARE_PROTECT_FINAL_CONSTRUCT() BEGIN_COM_MAP(CTicTacToeBoard) COM_INTERFACE_ENTRY(IMyClass) COM_INTERFACE_ENTRY(IDispatch) COM_INTERFACE_ENTRY(ISupportErrorInfo) END_COM_MAP() // ISupportsErrorInfo STDMETHOD(InterfaceSupportsErrorInfo)(REFIID riid)...
In this example, we declare an array, fill it with data and then print the contents of the array to the console. int[] numbers = new int[5]; We create an integer array which can store up to 5 integers. So we have an array of five elements, with indexes 0..4. ...
To run a test, from jshell, declare a circle object and call the printShapeInfo method. The result is the following:Copy code snippet Copied to Clipboard Error: Could not Copy Copied to Clipboard Error: Could not Copy jshell> var circle = new Circle(new Point(10, 10), 50) circle ==...
在使用Java局部内部类或者内部类时,若该类调用了所在方法的局部变量,则该局部变量必须使用final关键字来修饰,否则将会出现编译错误“Cannot refer to a non-final variable * inside an inner class defined in a different method” 下面通过一段代码来演示和分析原因。