Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '*'

Question

This is how I call the method.

public static void main(String[]args) {
        Scanner input = new Scanner(System.in);
        customPrint(7,10);

This is my method

public static void customPrint(int intValue, int fieldWidth) {
        System.out.printf("%*%d", fieldWidth, intValue); 
    }

My motive is to use the fieldwith as a variable in the printf statement and output the integer with the field with. However I get an error: Exception in thread "main" java.util.UnknownFormatConversionException: Conversion = '*' Any solutions?

Expected output 1

Answer 1

Based on your question we cannot specify the correct output for your program. But the error is occurred due to the first argument given to the printf() method.

• If you want the two integers to appear then it is System.out.printf("%d%d", fieldWidth, intValue);.
• Else if it is string with integer it is System.out.printf("%s%d", "fieldWidth", intValue);.