Question

所以我应该创建一个程序，将温度设置为摄氏度和华氏度。在其中我创建了一个equals方法。然后我要创建一个运行它的驱动程序，并使用equals方法测试温度以确定它们是否相等。我无法获得正确的布尔值，它只是继续吐出错误。在这里打墙。代码如下：

公共课温度 { public enum Scale {CELSIUS，FARENHEIT};

public static final double DEFAULT_DEGREES = 0.0;

private double temperature;
private Scale scale;

public Temperature()
{
    this(Temperature.DEFAULT_DEGREES);
}//default

public Temperature(double newTemperature)
{
    this(newTemperature, Scale.CELSIUS);
}//ending bracket of constructor double

public Temperature(Scale newScale)
{
    this(0, newScale);
}//end of constructor scale

public Temperature(double newTemperature, Scale newScale)
{
    this.setTemperature(newTemperature);
    this.setScale(newScale);
}//end bracket of constructor degrees and scale

public Scale getScale()
{
    return this.scale;
}//end of method getScale

public void setScale(Scale newScale)
{
    this.scale=newScale;
}//end of method setScale

public double getTemperature()
{
    return this.temperature;
}//ending bracket of metho getTemperature

public void setTemperature(double newTemperature)
{
    if(newTemperature < Temperature.DEFAULT_DEGREES)
    {
        this.temperature=Temperature.DEFAULT_DEGREES;
    }
    else
    {
        this.temperature = newTemperature;
    }//ending of if
}//ending bracket of method setTemperature

public double getTemperatureInFarenheit()
{
    double rv;

    if(this.getScale() == Scale.CELSIUS)
    {
        rv= this.getTemperature();
    }
    else
    {
        rv = ((this.getTemperature()* 1.8) + 32);
    }//end of if

    return rv;
}//end of bracket of method getweightinfarenheit


public double getTemperatureInCelsius()
{
    double rv;

    if(this.getScale() == Scale.FARENHEIT)
    {
        rv = this.getTemperature();
    }
    else
    {
        rv= ((this.getTemperature()- 32) * 0.5556);
    }

    return rv;
}//end of method gettemperatureincelsius

public boolean equals(Object otherObject)
{
    boolean rv = false;

    if(otherObject instanceof Temperature)
    {

        Temperature otherTemperature = (Temperature)otherObject;

        if((this.getTemperature()== otherTemperature.getTemperature())
        &&(this.getScale()== otherTemperature.getScale()))
        {
            rv = true;
        }//end of nested if
    }//end of if

    return rv;
}//end of bracket method equals

} //结束课程

这是我的司机：

公共类TemperatureDriver {

public static void main(String[]args)
{


    Temperature w1 = new Temperature();
    w1.setTemperature(32);
    w1.setScale(Temperature.Scale.FARENHEIT);
    Temperature w2 = new Temperature();
    w2.setTemperature(0);
    w2.setScale(Temperature.Scale.CELSIUS);

    System.out.println(w1.equals(w2));

    Temperature w3 = new Temperature();
    w3.setTemperature(-40.0);
    w3.setScale(Temperature.Scale.FARENHEIT);
    Temperature w4 = new Temperature();
    w4.setTemperature(-40.0);
    w4.setScale(Temperature.Scale.CELSIUS);

    System.out.println(w3.equals(w4));

    Temperature w5 = new Temperature();
    w5.setTemperature(212);
    w5.setScale(Temperature.Scale.FARENHEIT);
    Temperature w6 = new Temperature();
    w6.setTemperature(100);
    w6.setScale(Temperature.Scale.CELSIUS);

    System.out.println(w5.equals(w6));




}//end of method main

} //类的结束Temperaturedriver

Answer 1

所以我看到了几个问题。首先，在你的实施中 getTemperatureInCelsius（）

if(this.getScale() == Scale.FARENHEIT)

应该是，我认为，

if(this.getScale() == Scale.CELSIUS)

，反之亦然，以实现getTemperatureInFarenheit。

一旦这些问题得到解决，我认为你的平等主要问题是坚持规模是一样的。你在哪里

if((this.getTemperature()== otherTemperature.getTemperature())
    &&(this.getScale()== otherTemperature.getScale()))

应该是

if(this.getTemperatureInFarenheit()== otherTemperature.getTemperatureInFahrenheit())

我故意在Farenheit中进行比较，以避免在摄氏转换因子中进行舍入。这可能会使equals工作（一旦我为getTemperatureInFarenheit提到了修复）。

我仍然认为我会更喜欢说像

这样的话

if(Math.abs(this.getTemperatureInFarenheit()-otherTemperature.getTemperatureInFahrenheit())<0.001)

比我上面的建议，如果上述失败，我会尝试。

无法使我的布尔值工作

1 个答案: