@Override musical note was added inwards JDK 1.5 together with it is used to teach compiler that method annotated amongst @Override is an overridden method from super class or interface. Though it may await petty @Override is especially useful while overriding methods which receive got Object every bit parameter but similar equals, compareTo or compare() method of Comparator interface. @Override is i of the iii built inwards musical note provided past times Java 1.5, other 2 are @SuppressWarnings and @Deprecated. Out of these iii @Override is virtually used because of its full general nature, while @SuppressWarnings is every bit good used piece using Generics, @Deprecated is generally for API together with library. If you lot receive got read my article common errors piece overriding equals method than you lot receive got encounter that i of the error Java programmer makes it, write equals method amongst 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);
}
}
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 together with non fifty-fifty surface on runtime past times whatever Exception together with it’s rattling difficult to detect. @Override annotation inwards Java forbid this category of mistake. if you lot seat @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 thence it throw compilation error similar "method does non override or implement a method from a super type. In brusk @Override annotation saves lot of debugging elbow grease past times avoiding this severe error inwards Java. This unmarried argue is plenty to convince programmer to e'er purpose @Override annotation piece implementing super type methods.
I volition hand you lot i to a greater extent than example, where @Override musical note has saved me a lot of times. Sometime I brand error like, overriding method without argument, which means, I recall to override a method, which takes an declaration together with ends upward writing a novel method amongst same cite without argument. This driblet dead genuinely nasty, especially if master copy method is non abstract, because thence compiler volition non present whatever warning or error. But if you lot are using @Override annotation, Compiler volition alarm you lot amongst error that it genuinely does non override super bird method.
Apart from compile fourth dimension checking of overriding, @Override can every bit good hold out used past times IDE together with static code analyzer to advise a default implementation or coding best practices.
@Override annotation inwards Java 1.6
One of the major employment amongst @Override annotation on JDK 1.5 was that it tin alone hold out used to inwards conjunction amongst super class i.e. compiler throws error if you lot purpose @Override annotation amongst interface method. From Java half dozen onwards you lot tin purpose @Override annotation piece implementing interface method every bit well. This provides robust compile fourth dimension checking of overriding. If you lot receive got been using Eclipse IDE than you lot must receive got faced number along @Override annotation where compiler complains fifty-fifty if you lot override interface method together with alone cook 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 musical note whenever application, suggested past times Google's Java best exercise guide every bit well. @Override is legal inwards next cases :
Only place, where you lot don't desire to purpose @Override is when the rear method is @Deprecated.
That's all on @Override annotation inwards Java. It's i of the best Java coding exercise to purpose @Override annotation piece overriding whatever method from super bird or interface.
You should e'er purpose @Override musical note whenever application, suggested past times Google's Java best exercise guide every bit well. @Override is legal inwards next cases :
- When a bird method is overriding a super-class method.
- When a bird method is implementing an interface method.
- When an interface method respecifying a super-interface method.
Only place, where you lot don't desire to purpose @Override is when the rear method is @Deprecated.
That's all on @Override annotation inwards Java. It's i of the best Java coding exercise to purpose @Override annotation piece overriding whatever method from super bird or interface.
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