Java 开关和方法

我试着用不同的方法做一个温度转换器。现在，我有点被卡住了。我在一个方法中创建了一个开关，它有一个char，一个double和另一个char作为参数，这3个参数表示转换的温度，实际温度本身和用户想要转换的温度。我一直在尝试创建此开关，但到目前为止，我没有任何运气。也许我说得不够清楚。很抱歉我想很明显，我是一个初学者，这就是家庭作业。我不是要得到全部的代码，只是一些提示，让我们重新回到正轨。非常感谢！：-）

这是我想要切换到的方法，但是我需要从另一个输入的信息 我将在下面发布的方法

public static double convertTemp( char uFrom, double temp, char uTo ){          

}

此方法将执行从摄氏到开尔文或华氏的实际转换

public static double convFromCelsius( double value, char unitTo ){


}

再次非常感谢

这是我到目前为止得到的

导入java.util.Scanner

课堂作业{

// Main Method
public static void main( String[] args ){

    char   scaleFrom = ' '; // From which temperature scale to convert from
    char   scaleTo   = ' '; // To which temperature scale to convert to 

    double tempFrom  = 0.0; // Temperature value to be converted
    double tempTo    = 0.0; // Temperature value converted 
    double result    = 0.0; // Result of the conversion 

    // Loop to repeat the menu until option chosen is "x"
    //  do {

        /* 
            Method to display the menu and store the scale from 
                which the temperature will be converted from
        */
        scaleFrom = displayMenu(scaleFrom);

        /* 
            Only asks user to input more information, 
            if scaleFrom is different than "x" ( x = Exit )
        */
        //if ( scaleFrom != 'x' ){

            /* 
                Method to get the temperature value to be 
                    converted and store the value entered by user
            */
            tempFrom = getTemp(tempFrom);

            /* 
                Method to get the scale to which the 
                    temperature value will be converted to
            */
            scaleTo = getUnitTo(scaleTo);

            // Method to convert the Temperature
            //result = convertTemp( scaleFrom, tempFrom, scaleTo );

            // Method to display the conversion to the screen
            //displayResult( scaleFrom, tempFrom, scaleTo, result );

        //}
    //} while ( scaleFrom != 'x' );
}

// Method to invoke the conversion of the temperature
public static double convertTemp( char uFrom, double temp, char uTo ){







}

//  Method to convert temperatures in Celsius to the other ones
public static double convFromCelsius( double value, char unitTo ){


}




//  Method to convert temperatures in Fahrenheit to the other ones
//public static double convFromFahrenheit( double value, char unitTo ){

    // body of the Method

//}return;




//  Method to convert temperatures in Kelvin to the other ones
//public static double convFromKelvin( double value, char unitTo ){

    // body of the Method

//}return;

public static char displayMenu (char scaleFrom){

    Scanner ui = new Scanner (System.in);

    System.out.println ("");
    System.out.println ("============================");
    System.out.println ("   Temperature Conversion");
    System.out.println ("=========== MENU ===========");
    System.out.println ("");
    System.out.println ("a. From Celsius");
    System.out.println ("b. From Fahrenheit");
    System.out.println ("c. From Kelvin");
    System.out.println ("");
    System.out.println ("x. Exit");
    System.out.println ("");
    System.out.println ("============================");
    System.out.println ("Enter an option: ");
    System.out.println ("");

    scaleFrom = ui.nextLine().charAt(0);
    return scaleFrom;
}

public static double getTemp (double getTemp){

    Scanner ui = new Scanner (System.in);

    System.out.println ("");
    System.out.println ("Please, enter the temperature you want to convert: ");
    System.out.println ("");

    getTemp = Double.parseDouble(ui.nextLine());    

    return getTemp;
}

public static char getUnitTo (char scaleTo){

    Scanner ui = new Scanner (System.in);

    System.out.println ("");
    System.out.println ("Please, choose the temperature you want to convert to:");
    System.out.println ("");
    System.out.println ("C = To Celsius  K = To Kelvin  F = To Fahrenheit");
    System.out.println ("");

    scaleTo = ui.nextLine().charAt(0);
    return scaleTo;
}

---

}//课后主要作业//

我想你想要的是：

public static double convertTemp( char uFrom, double temp, char uTo ){          
    switch (uFrom) {
        case 'c':
            return convertFromCelsius(temp, uTo);
        case 'f':
            return convertFromFahrenheit(temp, uTo);
        case 'k':
            return convertFromKelvin(temp, uTo);
        default:
            System.out.println("Unexpected unit");
            return 0;
    }
}

public static double convFromCelsius( double value, char unitTo ){
    switch (unitTo) {
        case 'f':
            // Code to convert from c to f
            return value + 30;
        case 'k':
            // Code to convert from c to k
            return value + 273;
        default:
            System.out.println("Unexpcted unit");
            return 0;
    }
}

---

为什么您需要一个

temp

变量？在摄氏度、华氏度和开尔文之间的转换是定义良好的公式。请提供这些方法的输入和输出示例。抱歉，我不明白。你能再具体一点吗？干杯。

开关在哪里？你试过了吗？不，就是这样。我还不知道怎么换。干杯