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When do you use Java s @Override annotation and why?
Java, What does @Override mean?

我正在检查Drools Planner,例如来源代码。

@Override
protected Solver createSolver() {
    XmlSolverConfigurer configurer = new XmlSolverConfigurer();
    configurer.configure(SOLVER_CONFIG);
    return configurer.buildSolver();
}

protected Solver createSolverByApi() {
    // Not recommended! It is highly recommended to use XmlSolverConfigurer with an XML configuration instead.
    SolverConfig solverConfig = new SolverConfig();

    solverConfig.setSolutionClass(NQueens.class);
    .....TRUNCATED....
    solverPhaseConfigList.add(localSearchSolverPhaseConfig);
    solverConfig.setSolverPhaseConfigList(solverPhaseConfigList);
    return solverConfig.buildSolver();
}

就我所知,createSolver()和createSolverByApi()应当返还。当你明确称呼它们时,可以撒谎。

<代码>@ 此处指的是超低温带/代码。 <>>这一术语的一般含义是什么?

http://www.un.org。我很坏;我无意中重复了。 @Override的意思是什么?

Answer 1

Java Annotations。

The @Override means that the method is overriding the parent class (in this case createSolver).

The Javadoc states for @Override:

Indicates that a method declaration is intended to override a method declaration in a superclass.

这种说明有助于进行编辑时检查,以核实你重新压倒一切的方法是有效的(掩盖正确)。

Answer 2

See the Java tutorial about annotations, and there the Annotations used by the compiler section. A quick copy-paste from the relevant part

@Override - @Override annotation informs汇编者,该要素意在超越超级类别中宣布的内容(将在题为“接口和遗产”的教训中讨论过渡方法)。

Answer 3

This is called an Annotation. It is actually not compiled into special code, but it helps avoiding errors: essentially, it indicates that the method overrides a method of a superclass. Not having this annotation can cause warnings, having this annotation but no superclass that has a method with the same annotation is even an error.

这避免了重复的错误:如果将<代码>超级类别<>/代码>中的方法重新命名,而不是倒数,那就会变成错误。

Answer 4

This is java annotation , in your case you would use @Override above a method to be sure that you are overriding a super class method , if you use it and the method is not in the super class because you type it name wrong for example an error will occur at compile time .

Answer 5

I want to add this : declared in a superClass or method declared in an interface (since Java 6)

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