Question

我执行了以下代码，但是出现了以下错误。我为最后一部分进行了一些编辑，以便以代码格式进行编辑。 RunUnitConvert.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.JOptionPane;

/**
* 
*  This is a test driver for the UnitConverter class
*  Write a unit conversion program that asks users to 
*  identify the unit from which they want to convert and 
*  the unit to which they want to convert. Legal units 
*  are in, ft, mi, mm, cm, m, and km. Define two 
*  objects of a class UnitConverter that convert 
*  between meters and a given unit.
*  
*/
public class RunUnitConverter
{
  public static void main(String[] args)
   {
           BufferedReader br;
           char fromUnit = '\0';
           char toUnit = '\0';
           double value = 0;

    //  prompt the user to enter unit to convert from
        System.out.print("Convert from: ");
    //  open up standard input
        br = new BufferedReader(new InputStreamReader(System.in));    
        try {
            fromUnit = (char)br.read();
        } catch (IOException ioe) {         
            System.exit(1);
        }
    // prompt user to enter unit to convert to
        System.out.print("Convert to: ");
        br = new BufferedReader(new InputStreamReader(System.in));
        try {
            toUnit = (char)br.read();
        } catch (IOException ioe) {
            System.exit(1);     
    }

    // create new UnitConvert objects
         UnitConverter from = new UnitConverter(fromUnit);
        UnitConverter to = new UnitConverter(toUnit);

    // prompt user to enter initial value to convert
        System.out.print("Value: ");
        br = new BufferedReader(new InputStreamReader(System.in));
        try {
            value = Double.parseDouble(br.readLine());
        } catch (IOException ioe) {
        System.exit(1);     
        }

        double metric = from.toMetric(value);
        double converted = to.fromMetric(metric);

        if (converted < 0) {
            System.out.println("ERROR: Bad Input");
        }
        else {
            System.out.println(value + " " + fromUnit + " = " + converted +    " " + toUnit);
        }
    }
}

UnitConvert.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.JOptionPane;

/**
* 
 *  This is a test driver for the UnitConverter class
*  Write a unit conversion program that asks users to 
*  identify the unit from which they want to convert and 
*  the unit to which they want to convert. Legal units 
*  are in, ft, mi, mm, cm, m, and km. Define two 
*  objects of a class UnitConverter that convert 
*  between meters and a given unit.
*  
*/
public class RunUnitConverter
{
    public static void main(String[] args)
    {
        BufferedReader br;
        char fromUnit = '\0';
        char toUnit = '\0';
    double value = 0;

    //  prompt the user to enter unit to convert from
        System.out.print("Convert from: ");
    //  open up standard input
        br = new BufferedReader(new InputStreamReader(System.in));    
        try {
            fromUnit = (char)br.read();
        } catch (IOException ioe) {         
            System.exit(1);
        }
    // prompt user to enter unit to convert to
        System.out.print("Convert to: ");
        br = new BufferedReader(new InputStreamReader(System.in));
        try {
            toUnit = (char)br.read();
        } catch (IOException ioe) {
            System.exit(1);     
        }

    // create new UnitConvert objects
        UnitConverter from = new UnitConverter(fromUnit);
        UnitConverter to = new UnitConverter(toUnit);

    // prompt user to enter initial value to convert
        System.out.print("Value: ");
        br = new BufferedReader(new InputStreamReader(System.in));
        try {
            value = Double.parseDouble(br.readLine());
        } catch (IOException ioe) {
        System.exit(1);     
       }

        double metric = from.toMetric(value);
       double converted = to.fromMetric(metric);

        if (converted < 0) {
            System.out.println("ERROR: Bad Input");
        }
        else {
        System.out.println(value + " " + fromUnit + " = " + converted + " " + toUnit);
     }
    }
}

这是我的错误输出和错误如下： javac RunUnitConverter.java char不能被解除引用 switch（strUnit.charAt（0））{ ^ char不能被解除引用 switch（strUnit.charAt（0））{ ^ 2个错误

Answer 1

您的问题与错误消息所说的完全相同。＆＃34; strUnit＆＃34;是char类型，它不是Object，因此没有方法。

什么是解除引用的错误？

1 个答案: