I am trying to make a JOptionPane get an input and assign it to an int but I am getting some problems with the variable types.
I am trying something like this:
Int ans = (Integer) JOptionPane.showInputDialog(frame,
"Text",
JOptionPane.INFORMATION_MESSAGE,
null,
null,
"[sample text to help input]");
But I am getting:
Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot
be cast to java.lang.Integer
Which sounds logical yet, I cannot think of another way to make this happen.
Thanks in advance
This question is related to
java
swing
user-input
int
joptionpane
// sample code for addition using JOptionPane
import javax.swing.JOptionPane;
public class Addition {
public static void main(String[] args) {
String firstNumber = JOptionPane.showInputDialog("Input <First Integer>");
String secondNumber = JOptionPane.showInputDialog("Input <Second Integer>");
int num1 = Integer.parseInt(firstNumber);
int num2 = Integer.parseInt(secondNumber);
int sum = num1 + num2;
JOptionPane.showMessageDialog(null, "Sum is" + sum, "Sum of two Integers", JOptionPane.PLAIN_MESSAGE);
}
}
Please note that Integer.parseInt throws an NumberFormatException if the passed string doesn't contain a parsable string.
String String_firstNumber = JOptionPane.showInputDialog("Input Semisecond");
int Int_firstNumber = Integer.parseInt(firstNumber);
Now your Int_firstnumber
contains integer value of String_fristNumber
.
hope it helped
This because the input that the user inserts into the JOptionPane
is a String
and it is stored and returned as a String
.
Java cannot convert between strings and number by itself, you have to use specific functions, just use:
int ans = Integer.parseInt(JOptionPane.showInputDialog(...))
Source: Stackoverflow.com