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Judul : Why Run @Override Musical Note Inwards Coffee - Coding Best Practice
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Why Run @Override Musical Note Inwards Coffee - Coding Best Practice

@Override tone was added inwards JDK 1.5 in addition to it is used to learn compiler that method annotated alongside @Override is an overridden method from super class or interface. Though it may expect petty @Override is especially useful while overriding methods which convey Object every bit parameter simply similar equals, compareTo or compare() method of Comparator  interface. @Override is ane of the 3 built inwards tone provided yesteryear Java 1.5, other 2 are @SuppressWarnings and @Deprecated. Out of these 3 @Override is almost used because of its full general nature, while @SuppressWarnings is too used spell using Generics, @Deprecated is by in addition to large for API in addition to library. If you lot direct maintain read my article common errors spell overriding equals method than you lot direct maintain encounter that ane of the error Java programmer makes it,  write equals method alongside non object declaration type every bit shown inwards below example:

public class Person{
    private String name;
 
    public boolean equals(Person person){
        return name.equals(person.name);
    }
}

here programmer is attempting to override equals() method,  but instead of overriding, its a overloaded method. This error silently escape from compiler in addition to non fifty-fifty surface on runtime yesteryear whatever Exception in addition to it’s real difficult to detect. @Override annotation inwards Java preclude this category of mistake. if you lot pose @Override annotation higher upward equals method than compiler volition verify  if this method truly overrides a super class or interface method or not. if its non in addition to then it throw compilation error similar "method does non override or implement a method from a super type. In curt @Override annotation saves lot of debugging travail yesteryear avoiding this severe error inwards Java. This unmarried argue is plenty to convince programmer to e'er purpose @Override annotation spell implementing super type methods.


I volition laissez passer on you lot ane to a greater extent than example, where @Override tone  has saved me a lot of times. Sometime I brand error like, overriding method without argument, which means, I intend to override a method, which takes an declaration in addition to ends upward writing a novel method alongside same elevate without argument. This larn truly nasty, especially if master copy method is non abstract, because in addition to then compiler volition non exhibit whatever warning or error. But if you lot are using @Override annotation, Compiler volition warning you lot alongside error that it truly does non override super shape method.

Apart from compile fourth dimension checking of overriding, @Override can too live on used yesteryear IDE in addition to static code analyzer to advise a default implementation or coding best practices.

@Override annotation inwards Java 1.6

One of the major work alongside @Override annotation on JDK 1.5 was that it tin alone live on used to inwards conjunction alongside super class i.e. compiler throws error if you lot purpose @Override annotation alongside interface method. From Java half dozen onwards you lot tin purpose @Override annotation spell implementing interface method every bit well. This provides robust compile fourth dimension checking of overriding. If you lot direct maintain been using Eclipse IDE than you lot must direct maintain faced number along @Override annotation where compiler complains fifty-fifty if you lot override interface method in addition to alone create was either take all @Override annotation from interface method or shift to Java source 1.6 from compiler settings.

You should e'er purpose @Override tone whenever application, suggested yesteryear Google's Java best practise guide every bit well. @Override is legal inwards next cases :

1. When a shape method is overriding a super-class method.
2. When a shape method is implementing an interface method.
3. When an interface method respecifying a super-interface method.

Only place, where you lot don't desire to purpose @Override is when the bring upward method is @Deprecated.


That's all on @Override annotation inwards Java. It's ane of the best Java coding practise to purpose @Override annotation spell overriding whatever method from super shape or interface.

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