Java - Static Feature Examples

Java - Static Feature Examples

package javaPrograms;


public class StaticMemoryManagement {
  int a =20;
  static int b = 30;
  void add() {
    a=a+20;
    b=b+20;
    System.out.println("a is "+a);
    System.out.println("b is "+b);
  }
  static {
    System.out.println("static block is invoked before main method");
  }
  static void staticMethod() {
    System.out.println("static method would be called without need of creating object of a class");
  }
  void nonStaticMethod() {
    System.out.println("test"+b); // Static members are accessible directly by non static methods within class
  }
  public static void main(String args[]) {
    StaticMemoryManagement obj1 = new StaticMemoryManagement();
    obj1.add();
    StaticMemoryManagement obj2 = new StaticMemoryManagement();
    obj2.add();
    StaticMemoryManagement.staticMethod(); // It also works
    staticMethod(); // This also works
    obj1.nonStaticMethod();
    System.out.println(b);  // Static data members are accessible directly by static methods within same class
    System.out.println(obj1.a); // Non static members are accessible through objects only
  }


}

Output :

static block is invoked before main method

a is 40

b is 50

a is 40

b is 70

static method would be called without need of creating object of a class

static method would be called without need of creating object of a class

test70

70

40