我可以在同一程序包下的另一个类中调用一个类的静态方法吗？

Question

Can call a method by class name in same package without create object of class or without inheritance in java

public class BoxWeight /*extends Box*/{
    public static void main(String[] args) {
        /*BoxWeight myCat = new BoxWeight();*/
        /*Box myAnimal = myCat;*/
        Box.testClassMethod();<------------ why this possible 
        /* myAnimal.testInstanceMethod();*/
    }   
}

public class Box /*extends Bicycle*/{

    public static void testClassMethod() {
        System.out.println("The class" + " method in Box.");
    }
    public void testInstanceMethod() {
        System.out.println("The instance " + " method in Box.");
    }
}

my question is not this as you seems my qestion is this "Can call a method by class name in same package without create object of class or without inheritance in java" but i have fix this i want to confirm is this possible or not

Answer 1

You can call a method with the syntax ClassName.methodName() if the method is declared static , eg

class ClassName {
  static void methodName() {
    //...//
  }
}

More info about static class members can be found in the Java Tutorials .

Answer 2

Make your method static then you can call that method by class name.

class A {
static void display(){

    System.out.println("Called..");
}
}

In same package you can call it as .

A.display();