CODEWITHSUNDEEP
javaarraylistprintf
user2967353
user2967353

Reputation: 267

using printf on booleans

I have a question on how to display booleans with printf. In my case, I think the only problem I have is with displaying boolean types with printf. How can I fix this? Any help will be greatly appreciated. When I run my program, I get this:

run:
_____________________________________________________________________________________________________________
                   |        Household Waste Recycled        |     |            Pounds of CO2            |
_____________________________________________________________________________________________________________
Index      People       Paper     Plastic       Glass        Cans      Total Emission   ReductionNet Emission

Exception in thread "main" java.util.IllegalFormatConversionException: f != CO2FromWaste
at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4045)
at java.util.Formatter$FormatSpecifier.printFloat(Formatter.java:2761)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2708)
at java.util.Formatter.format(Formatter.java:2488)
at java.io.PrintStream.format(PrintStream.java:970)
at java.io.PrintStream.printf(PrintStream.java:871)
at CO2FromWasteTester.main(CO2FromWasteTester.java:55)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

Below is the code for my main method file:

import java.util.ArrayList;

public class CO2FromWasteTester {

public static void main(String args[]){

    ArrayList<CO2FromWaste> CO2 = new ArrayList<CO2FromWaste>();

    CO2.add(new CO2FromWaste(1, true, true, true, true));
    CO2.add(new CO2FromWaste(2, true, false, true, false));
    CO2.add(new CO2FromWaste(3, true, true, true, false));
    CO2.add(new CO2FromWaste(4, false, false, false, true));
    CO2.add(new CO2FromWaste(5, false, true, false, true));
    CO2.add(new CO2FromWaste(6, true, true, true, true));

    CO2FromWaste data;

    for(int i = 0; i < CO2.size(); i++){
        data = CO2.get(i);
        data.getNumberOfPeople();
        data.Paper();
        data.Plastic();
        data.Glass();
        data.Can();
        data.NetEmission();
        data.reduction();
        data.totalEmission();
    }

    // create table headings
    System.out.println("___________________________________________________"
            + "__________________________________________________________");
    System.out.printf("%65s%44s%n", "|        Household Waste Recycled        |",
            "|            Pounds of CO2            |");
    System.out.println("___________________________________________________"
            + "__________________________________________________________");
    System.out.printf("%1s%12s%12s%12s%12s%12s%20s%12s%12s%n%n", "Index", "People", 
            "Paper", "Plastic", "Glass", "Cans", "Total Emission", "Reduction", 
            "Net Emission");

    // call methods
    for(int i = 0; i < CO2.size(); i++){
        data = CO2.get(i);
        System.out.printf("%1f%1f%5b%5b%5b%5b%4.2f%4.2f%4.2f", 
                data = CO2.get(i), 
                data.getNumberOfPeople(), 
                data.Paper(), 
                data.Plastic(), 
                data.Glass(), 
                data.Can(), 
                data.totalEmission(), 
                data.reduction(), 
                data.NetEmission());
    }
}

}

Upvotes: 1

Views: 668

Answers (2)

Rastikan
Rastikan

Reputation: 532

Consider usage of the ternary operator:

printf("%s", (true==value)?"true":"false" );

Upvotes: 0

hichris123
hichris123

Reputation: 10233

It's because you are repeating the call data = CO2.get(i), and that can't be printed. Try this:

for(int i = 0; i < CO2.size(); i++){
        data = CO2.get(i);
        System.out.printf("%1f%1f%5b%5b%5b%5b%4.2f%4.2f%4.2f", 
                data.getNumberOfPeople(), 
                data.Paper(), 
                data.Plastic(), 
                data.Glass(), 
                data.Can(), 
                data.totalEmission(), 
                data.reduction(), 
                data.NetEmission());
}

Upvotes: 1

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