Static class programs in java

In Java, nested classes are of two types:. We have already discussed inner classes in the previous tutorial. Visit Java Nested Class if you want to learn about inner classes. Like regular classes, static nested classes can include both static and non-static fields and methods. For example,. In the above program, we have two nested class Mammal and Reptile inside a class Animal.

In Java, static nested classes are associated with the outer class. This is why static nested classes can only access the class members static fields and methods of the outer class.

In the above example, we have created a non-static method eat inside the class Animal. Now, if we try to access eat using the object mammal , the compiler shows an error.

It is because mammal is an object of a static class and we cannot access non-static methods from static classes. In the above example, we have tried to create a static class Animal. Course Index Explore Programiz. Java for Loop. Arrays in Java. Interfaces in Java. Java ArrayList. Related Articles. Table of Contents. Improve Article. Save Article. Like Article. NestedStaticClass printer. NestedStaticClass ;. InnerClass inner. InnerClass innerObject.

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Previous Object Class in Java. Here, "college" refers to the common property of all objects. If we make it static, this field will get the memory only once.

In this example, we have created an instance variable named count which is incremented in the constructor. Since instance variable gets the memory at the time of object creation, each object will have the copy of the instance variable. If it is incremented, it won't reflect other objects.

So each object will have the value 1 in the count variable. As we have mentioned above, static variable will get the memory only once, if any object changes the value of the static variable, it will retain its value. Ans It is because the object is not required to call a static method. If it were a non-static method, JVM creates an object first then call main method that will lead the problem of extra memory allocation. Ans No, one of the ways was the static block, but it was possible till JDK 1.

Since JDK 1. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services. Please mail your requirement at [email protected] Duration: 1 week to 2 week. Java Training Basics of Java. Abstract class Interface Abstract vs Interface. Package Access Modifiers Encapsulation. Static variable Program of the counter without static variable Program of the counter with static variable Static method Restrictions for the static method Why is the main method static?

Static block Can we execute a program without main method? Error: Main method not found in class A3, please define the main method as: public static void main String[] args or a JavaFX application class must extend javafx. Next Topic this keyword in java. Reinforcement Learning.