JOptionPane Input to int

Question

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

User · Answer

Please note that Integer parseInt throws an NumberFormatException if the passed string doesn t contain a parsable string

User · Answer

sample code for addition using JOptionPane  import javax swing JOptionPane   public class Addition        public static void main String   args             String firstNumber   JOptionPane showInputDialog  Input  lt First Integer gt              String secondNumber   JOptionPane showInputDialog  Input  lt Second Integer gt              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

User · Answer

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

User · Answer

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

User · Answer

Simply use   int ans   Integer parseInt  JOptionPane showInputDialog frame           Text           JOptionPane INFORMATION MESSAGE          null          null            sample text to help input        You cannot cast a String to an int  but you can convert it using Integer parseInt string

[java] JOptionPane Input to int

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