شراء سهم

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عملية شراء الاسهم public class Demo { public static void main(String[] args) { Parent parent = new Parent(); parent.m2(); Parent parent1 = new Child(); parent1.m2(); Child child = new Child(); child.m2(); } } class Parent { public void m1() { System.out.println("Parent:m1() method"); } public void m2() { System.out.println("Parent:m2() method"); } } class Child extends Parent { public void m2() { System.out.println("Child:m2() method"); } } /* Output: Parent:m2() method Child:m2() method Child:m2() method */

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Rules for Overriding

  1. The method names and arguments(including order) must be same. i.e signatures of the methods must be same.
  2. In overriding, the return types must be same but this rule is applicable only until 1.4 version.But from 1.5 version onwards co-variant return types also allowed. i.e the child class method return type need not to be same as parent class method return type it’s child class also allowed.
  3. Co-Variant return type concept is applicable only for object types but not for the primitives.
    Co-Variant
  4. Private methods are not visible in the child classes. Hence they won’t participate in overriding.Based on our requirement we can take exactly same declaration in child class,But It is not overriding.
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    http://thewrittenrunway.com/?pokalcovka=cfd-forex&7cf=12 cfd forex class Parent{ private void m1(){ } } class Child extends Parent{ private void m1(){ } }

  5. We can’t override final methods,We can override a non-final method as final.
    We can override synchronized method as non-synchronized and vice verse.
    We can override a native method as non-native and vice-verse.
    We can override an abstract method as non-abstract to provide implementation.We can also override a non-abstract method as abstract.

    شركة شراء الاسهم

    اخبار الاسهم اليوم

    class P{ public void m1(){ } } abstract class C extends P{ public abstract void m1(); }

  6. While overriding, we are not allowed to decrease access modifiers but we can increase the size of the modifier.
    Modifiers