Why Role @Override Tone Inward Coffee - Coding Best Practice
@Override notation was added inward JDK 1.5 in addition to it is used to instruct compiler that method annotated amongst @Override is an overridden method from super class or interface. Though it may await picayune @Override is specially useful while overriding methods which receive got Object equally parameter simply similar equals, compareTo or compare() method of Comparator interface. @Override is 1 of the 3 built inward notation provided past times Java 1.5, other ii are @SuppressWarnings and @Deprecated. Out of these 3 @Override is well-nigh used because of its full general nature, while @SuppressWarnings is likewise used spell using Generics, @Deprecated is to a greater extent than oftentimes than non for API in addition to library. If y'all receive got read my article common errors spell overriding equals method than y'all receive got run into that 1 of the error Java programmer makes it, write equals method amongst non object declaration type equally 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 past times whatever Exception in addition to it’s really difficult to detect. @Override annotation inward Java forestall this category of mistake. if y'all position @Override annotation higher upward equals method than compiler volition verify if this method genuinely overrides a super class or interface method or not. if its non in addition to thence it throw compilation error similar "method does non override or implement a method from a super type. In brusque @Override annotation saves lot of debugging sweat past times avoiding this severe error inward Java. This unmarried argue is plenty to convince programmer to ever role @Override annotation spell implementing super type methods.
I volition hand y'all 1 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 upward writing a novel method amongst same get upward without argument. This instruct genuinely nasty, especially if master method is non abstract, because in addition to thence compiler volition non demo whatever warning or error. But if y'all are using @Override annotation, Compiler volition alarm y'all amongst error that it genuinely does non override super flat method.
Apart from compile fourth dimension checking of overriding, @Override can likewise move used past times 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 occupation amongst @Override annotation on JDK 1.5 was that it tin terminate solely move used to inward conjunction amongst super class i.e. compiler throws error if y'all role @Override annotation amongst interface method. From Java six onwards y'all tin terminate role @Override annotation spell implementing interface method equally well. This provides robust compile fourth dimension checking of overriding. If y'all receive got been using Eclipse IDE than y'all must receive got faced number along @Override annotation where compiler complains fifty-fifty if y'all override interface method in addition to solely cook was either take away all @Override annotation from interface method or shift to Java source 1.6 from compiler settings.
You should ever role @Override notation whenever application, suggested past times Google's Java best exercise guide equally 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 1 of the best Java coding exercise to role @Override annotation spell overriding whatever method from super flat or interface.
You should ever role @Override notation whenever application, suggested past times Google's Java best exercise guide equally well. @Override is legal inward next cases :
- When a flat method is overriding a super-class method.
- When a flat 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 1 of the best Java coding exercise to role @Override annotation spell overriding whatever method from super flat or interface.
Further Learning
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