java String formatting up to two decimal places with a char

Question

So I'm having a trouble formatting a String.

My output should always be ##.##C or F (temperature conversion)

so here is my method:

public void setResultLabel(double inNumber, char inChar)
{   

    String number, letter;

    number = String.valueOf(inNumber);

    letter = String.valueOf(inChar);

    String temp;

    temp = number + letter;

    String format = String.format("%2.5s", temp); /* how do you make this code 
    so that the out put result will always be up to two decimal places 
    with a char C or F? */

    result.setText(format);

    add(result);
}

http://stackoverflow.com/questions/21995817/java-decimalformat — seenukarthi, Dec 14 '14 at 04:40

score 1 · Accepted Answer · answered Dec 14 '14 at 05:24

1

public void setResultLabel(double inNumber, char inChar)
{   

    String number, letter;
    DecimalFormat decimalFormat = new DecimalFormat("##.##"+inChar);


    String formated = decimalFormat.format(inNumber); 
    /* formated  is your result  */
    // System.out.println(formated);

    result.setText(format);
    add(result);
}

answered Dec 14 '14 at 05:24

Saif

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glad to know it helped. @corkiiunranked – Saif Dec 14 '14 at 05:48

Marv · Answer 2 · 2014-12-14T04:45:06.413

Use DecimalFormat to format decimal numbers. To change the decimal mark from a "," to a "." (if needed), use DecimalFormatSymbols

public void setResultLabel(double inNumber, char inChar) {   
    DecimalFormatSymbols dfs = new DecimalFormatSymbols();
    dfs.setDecimalSeparator('.');
    DecimalFormat df = new DecimalFormat("##.##");
    df.setDecimalFormatSymbols(dfs);

    result.setText(df.format(inNumber) + inChar);
    add(result);
}

Note that usually DecimalFormat would be a field in your class since you don't want to create a new DecimalFormat and a new DecimalFormatSymbols every time you call the setResultLabel() method.

score 0 · Answer 3 · answered Dec 14 '14 at 05:03

You can achieve the desired result using following code snippet.

double p =10.1234;
char s = 'F';
String formatted = String.format("%.2f%S", p, s);
System.out.println(formatted);

You can find more information about formatting at oracle. Note that there are other alternatives as well to achieve the output, you can find the useful links here.

java String formatting up to two decimal places with a char

3 Answers3