如何返回类-输入方法 [英] How to return class - type in a method

问题描述

我上课

public class Engine {

    Double engineSize;
    public Engine(){
        this.engineSize = 1.0;
    }
    public Double getEngineSize() {

        return engineSize;
    }
}

我还有另一堂课:

public class ModelT {

    public Engine getEngine() {

        return null;
    }}

现在，我想通过此测试:

Now I want to pass this test:

@Test

public void shouldHaveTheCorrectEngineSize(){
    assertThat(modelT.getEngine().getEngineSize(), is(1.0));
}

我很难在方法中返回引擎类型，我尝试了几种方法，但是知识有限，因为我是Java的初学者.请您告诉我我该怎么做?以及我可以进一步阅读的概念的名称是什么.

I have the difficulty how can I return the Engine type in a method, I tried several ways but knowledge is limited because I am beginner to java.. Could you please tell me how could i do this? and what is the name of concept that i could further read on..

推荐答案

也许我不理解您的问题，但是您的测试永远不会返回ok，因为在您的ModelT方法getEngine中，您返回的是null..

Maybe i'm not understanding your question but your test never will return ok because in your ModelT method getEngine you are returning a null..

尝试以下代码:

public class ModelT {
    public Engine getEngine() {
        return new Engine();
    }
}

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