numberformatexception – Tarik Billa

What is a NumberFormatException and how can I fix it?

December 20, 2023 by Tarik

Error Message: Exception in thread “main” java.lang.NumberFormatException: For input string: “Ace of Clubs” at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Integer.parseInt(Integer.java:580) at java.lang.Integer.parseInt(Integer.java:615) at set07102.Cards.main(Cards.java:68) C:\Users\qasim\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml:53: Java returned: 1 means: There was an error. We try to give you as much information as possible It was an Exception in main thread. It’s called NumberFormatException and has occurred for input … Read more

Double value to round up in Java

August 11, 2023 by Tarik

Note the comma in your string: “1,07”. DecimalFormat uses a locale-specific separator string, while Double.parseDouble() does not. As you happen to live in a country where the decimal separator is “,”, you can’t parse your number back. However, you can use the same DecimalFormat to parse it back: DecimalFormat df=new DecimalFormat(“0.00”); String formate = df.format(value); … Read more

Convert hex color value ( #ffffff ) to integer value

June 26, 2023 by Tarik

The real answer is to use: Color.parseColor(myPassedColor) in Android, myPassedColor being the hex value like #000 or #000000 or #00000000. However, this function does not support shorthand hex values such as #000.

How can I prevent java.lang.NumberFormatException: For input string: “N/A”?

January 16, 2023 by Tarik

“N/A” is not an integer. It must throw NumberFormatException if you try to parse it to an integer. Check before parsing or handle Exception properly. Exception Handling try{ int i = Integer.parseInt(input); } catch(NumberFormatException ex){ // handle your exception … } or – Integer pattern matching – String input=…; String pattern =”-?\\d+”; if(input.matches(“-?\\d+”)){ // any … Read more

Why do Double.parseDouble(null) and Integer.parseInt(null) throw different exceptions?

January 15, 2023 by Tarik

It is reasonable to expect the same exceptions to be thrown for null; however, these api’s are very old and may not be able to be changed at this point. And: Since the exception behavior is long-standing and specified in the JavaDoc, it is impractical to change either method’s behavior at this time. Closing as … Read more