Java.lang.String cannot be converted to int

Question

In my program that turns roman numerals into arabic numbers I have run across the error

incompatible types: java.lang.String cannot be converted into int

Here is my code

if ( Character.isDigit(TextIO.peek()) ) {
    int arabic = TextIO.getlnInt();
    try {
        RomanNumerals N = new RomanNumerals(arabic);
        TextIO.putln(N.toInt() + " = " + N.toString());
    }
    catch (NumberFormatException e) {
        System.out.println("Invalid input.");
        System.out.println(e.getMessage());
    }
}
else {
    String roman = TextIO.getln();
    try {
        RomanNumerals N = new RomanNumerals(roman);
        System.out.println(N.toString() + " = " + N.toInt());
    }
    catch (NumberFormatException e) {
        System.out.println("Invalid input.");
        System.out.println(e.getMessage());
    }
}

I am using BlueJ and the error is being highlighted over "(roman)"

The constructor for RomanNumerals must expect an int, and you're giving it a String. You need to convert it into an int. — resueman
– resueman, Commented Jan 9, 2016 at 19:35

Jan · Accepted Answer · 2016-01-09 19:35:22Z

0

Guesswork here... but probably your class RomanNumerals does not have a constructor taking a string as an argument like

public RomanNumerals(String r) {

Thats why calling it that way:

RomanNumerals N = new RomanNumerals(roman);

Is not permitted.

answered Jan 9, 2016 at 19:35

Jan

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Comments

John Sensebe · Accepted Answer · 2016-01-09 19:42:56Z

0

I'm looking at TextIO.putln(N.toInt() + " = " + N.toString()); and imagining that N.toInt() returns an int and the compiler is confused when you try adding " = " to it.

Try TextIO.putln(Integer(N.toInt()).toString() + " = " + N.toString());.

answered Jan 9, 2016 at 19:42

John Sensebe

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