為什么我收到“找不到符號”錯誤？[復制]-有解無憂

這個問題在這里已經有了答案：為什么我收到“找不到符號”錯誤？[復制]

package exceptions;

import java.util.ArrayList;
import java.util.List;

public class TemperatureAverage {

        /** prints the average temperature from values provided as command-line arguments
         * 
         * @param args space-separated list of temperatures
         */
        public static void main(String[] args) {
        
        try {
            List<Integer> recordedTemperaturesInDegreesCelcius=new ArrayList<Integer>();

            // fill the list from values provided as command-line arguments
            for(String stringRepresentationOfTemperature: args) {
                int temperature=Integer.parseInt(stringRepresentationOfTemperature);
                recordedTemperaturesInDegreesCelcius.add(temperature);
            }
        }
        catch(ArithmeticException e) {
            System.out.println("Arithmetic error : Try to had a correct temperature (integer, no 0..etc) ");
            //calculate and print the average temperature
            int averageTemperature=SimpleMaths.calculateAverage(recordedTemperaturesInDegreesCelcius);
            System.out.println("The average temperature is "   averageTemperature);
        }
    }

}

uj5u.com熱心網友回復：

您recordedTemperaturesInDegreesCelcius在內宣告try，這意味著它只能在try塊內訪問。那就是它的范圍。如果想在catchblock中訪問，需要在tryblock外宣告，如下：

public class TemperatureAverage {
    public static void main(String[] args) {
        List<Integer> recordedTemperaturesInDegreesCelcius=new ArrayList<Integer>();
        try {
            // fill the list from values provided as command-line arguments
            for(String stringRepresentationOfTemperature: args) {
                int temperature=Integer.parseInt(stringRepresentationOfTemperature);
                recordedTemperaturesInDegreesCelcius.add(temperature);
            }
        }
        catch(ArithmeticException e) {
            System.out.println("Arithmetic error : Try to had a correct temperature (integer, no 0..etc) ");
            //calculate and print the average temperature
            int averageTemperature=SimpleMaths.calculateAverage(recordedTemperaturesInDegreesCelcius);
        }

        System.out.println("The average temperature is "   averageTemperature);
    }
}

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