Why Hold Upward @Override Musical Note Inwards Coffee - Coding Best Practice
@Override notation was added inward JDK 1.5 in addition to it is used to instruct compiler that method annotated alongside @Override is an overridden method from super class or interface. Though it may expect niggling @Override is peculiarly useful while overriding methods which convey Object every bit parameter only similar equals, compareTo or compare() method of Comparator interface. @Override is i of the 3 built inward notation provided yesteryear Java 1.5, other 2 are @SuppressWarnings and @Deprecated. Out of these 3 @Override is nearly used because of its full general nature, while @SuppressWarnings is too used spell using Generics, @Deprecated is to a greater extent than ofttimes than non for API in addition to library. If y'all conduct keep read my article common errors spell overriding equals method than y'all conduct keep encounter that i of the error Java programmer makes it, write equals method alongside non object declaration type every bit shown inward below example:
public class Person{
private String name;
public boolean equals(Person person){
return name.equals(person.name);
}
}
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 really difficult to detect. @Override annotation inward Java forestall this category of mistake. if y'all set @Override annotation inward a higher house equals method than compiler volition verify if this method genuinely overrides a super class or interface method or not. if its non thus 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 inward Java. This unmarried argue is plenty to convince programmer to e'er role @Override annotation spell implementing super type methods.
I volition laissez passer on y'all i to a greater extent than example, where @Override notation 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 upwardly writing a novel method alongside same advert without argument. This teach genuinely nasty, especially if master copy method is non abstract, because thus compiler volition non exhibit whatever warning or error. But if y'all are using @Override annotation, Compiler volition warning y'all alongside error that it genuinely 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 inward Java 1.6
One of the major work alongside @Override annotation on JDK 1.5 was that it tin exclusively live on used to inward conjunction alongside super class i.e. compiler throws error if y'all role @Override annotation alongside interface method. From Java six onwards y'all tin role @Override annotation spell implementing interface method every bit well. This provides robust compile fourth dimension checking of overriding. If y'all conduct keep been using Eclipse IDE than y'all must conduct keep faced number along @Override annotation where compiler complains fifty-fifty if y'all override interface method in addition to exclusively cook was either take away all @Override annotation from interface method or shift to Java source 1.6 from compiler settings.
You should e'er role @Override notation whenever application, suggested yesteryear Google's Java best exercise guide every bit well. @Override is legal inward next cases :
Only place, where y'all don't desire to role @Override is when the rear method is @Deprecated.
That's all on @Override annotation inward Java. It's i of the best Java coding exercise to role @Override annotation spell overriding whatever method from super shape or interface.
You should e'er role @Override notation whenever application, suggested yesteryear Google's Java best exercise guide every bit well. @Override is legal inward next cases :
- When a shape method is overriding a super-class method.
- When a shape method is implementing an interface method.
- When an interface method respecifying a super-interface method.
Only place, where y'all don't desire to role @Override is when the rear method is @Deprecated.
That's all on @Override annotation inward Java. It's i of the best Java coding exercise to role @Override annotation spell overriding whatever method from super shape or interface.
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