在Java中使用printf顯示信息

我有一個關於如何使用printf進行格式化的問題。我用printf 3次;每3次，我用printf完全一樣，用1s%10.2f%n1。不知何故，我不認爲我的第三次使用printf正在工作。我怎樣才能解決這個問題？任何幫助將不勝感激。當我編譯並執行它，我得到這個：在Java中使用printf顯示信息

run: 
Average Monthly Electricity Bill:  463.26 
Average Monthly Electricity Price Per Kilowatt:  4.83 
Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '10.2f' 
at java.util.Formatter.format(Formatter.java:2487) 
at java.io.PrintStream.format(PrintStream.java:970) 
at java.io.PrintStream.printf(PrintStream.java:871) 
at CO2FromElectricityTester.main(CO2FromElectricityTester.java:43) 
CO2 Emissions from Electricity Usage in a 3 Month Period: 394.56000000000006Java Result: 1 
BUILD SUCCESSFUL (total time: 0 seconds)

這裏是我寫的兩個文件：

CO2FromElectricityTester.java：

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/** 
* 
* @author timothylee 
*/ 
public class CO2FromElectricityTester { 

public static void main(String args[]){ 

    // declare & initialize variables 
    double months = 3.0; 
    double emissionFactor = 1.37; 
    int kilowattHoursSept = 109; 
    int kilowattHoursOct = 87; 
    int kilowattHoursNov = 93; 
    double monthlyCostSept = 551.51; 
    double monthlyCostOct = 392.84; 
    double monthlyCostNov = 445.42; 
    double avgKilowattHours = (kilowattHoursSept + kilowattHoursOct + 
      kilowattHoursNov)/3; 
    double avgMonthlyCost = (monthlyCostSept + monthlyCostOct + 
      monthlyCostNov)/3; 

    // create object 
    CO2FromElectricity CO2 = new CO2FromElectricity(); 

    // declare & initialize variables for methods 
    double avgPricePerKilowatt = CO2.calcPricePerKilowatt(avgKilowattHours, 
      avgMonthlyCost); 
    double avgCO2Emission = CO2.calcCO2Emission(emissionFactor, months, 
      avgMonthlyCost, avgPricePerKilowatt); 

    ///////////////// display results 
    System.out.printf("%1s%10.2f%n", "Average Monthly Electricity Bill: ", 
      avgMonthlyCost); 
    System.out.printf("%1s%10.2f%n", "Average Monthly Electricity Price Per " 
      + "Kilowatt: ", avgPricePerKilowatt); 
    System.out.printf("%1s%10.2f%n", "CO2 Emissions from Electricity Usage " 
      + "in a 3 Month Period: " + avgCO2Emission); 
} 

}

CO2FromElectricity.java：

/* 
* To change this license header, choose License Headers in Project Properties. 
* To change this template file, choose Tools | Templates 
* and open the template in the editor. 
*/ 

/** 
* 
* @author timothylee 
*/ 
public class CO2FromElectricity { 

// default constructor 
CO2FromElectricity(){ 

} 

// method for calculating price per kilowatt 
public double calcPricePerKilowatt(double kilowattHours, double monthlyCost){ 
    return monthlyCost/kilowattHours; 
} 

// method for calculating CO2 emission 
public double calcCO2Emission(double emissionFactor, double months, 
     double avgMonthlyCost, double avgPricePerKilowatt){ 
    return (avgMonthlyCost/avgPricePerKilowatt) * emissionFactor * months; 
} 

}

來源

2013-12-08 user2967353

在您的第三個'printf'中，您不會傳遞方法應該從中格式化字符串的參數。您將'avgCO2Emission'附加到格式字符串，而不是將其作爲單獨的參數傳遞。 – Vulcan

前兩個printf行在非格式化字符串和數字之間使用逗號。不工作的人有一個+而不是逗號。

來源

2013-12-08 18:40:43 JenGettings

在Java中使用printf顯示信息

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