/*static means that the variable or method marked as such is
available at the class level. In other words, you don't need to
create an instance of the class to access it. */
public class Foo { public static void doStuff(){ // does stuff }
}
/* So, instead of creating an instance of Foo and then calling doStuff
like this: */
Foo f = new Foo();
f.doStuff();
//You just call the method directly against the class, like so:
Foo.doStuff();

In Java, static keyword is mainly used for memory management.
It can be used with variables, methods, blocks and nested classes.
It is a keyword which is used to share the same variable or method of a given
class. Basically, static is used for a constant variable or a method
that is same for every instance of a class

public class ATM{ // Static variables public static int totalMoney = 0; public static int numATMs = 0; // A static method public static void averageMoney(){ System.out.println(totalMoney / numATMs); } public static void main(String[] args){ //Accessing a static variable System.out.println("Total number of ATMs: " + ATM.numATMs); // Calling a static method ATM.averageMoney(); }
}

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public class TestMyStaticClass { public static void main(String []args){ MyStaticClass.setMyStaticMember(5); System.out.println("Static value: " + MyStaticClass.getMyStaticMember()); System.out.println("Value squared: " + MyStaticClass.squareMyStaticMember()); // MyStaticClass x = new MyStaticClass(); // results in compile time error }
}
// A top-level Java class mimicking static class behavior
public final class MyStaticClass { private MyStaticClass () { // private constructor myStaticMember = 1; } private static int myStaticMember; public static void setMyStaticMember(int val) { myStaticMember = val; } public static int getMyStaticMember() { return myStaticMember; } public static int squareMyStaticMember() { return myStaticMember * myStaticMember; }
}