10 Reasons of java.lang.NumberFormatException in Java - Solution

The NumberFormatException is one of the most common errors in Java application along with NullPointerException. This error comes when you try to convert a String into numeric data types e.g. int, float, double, long, short, char or byte. The data type conversion methods like Integer.parseInt(), Float.parseFloat(), Double.parseDoulbe(), and Long.parseLong() throws NumberFormatException to signal that input String is not valid numeric value. Even though the root cause is always something which cannot be converted into a number, there are many reasons and input due to which NumberFormatException occurs in Java application. Most of the time I have faced this error while converting a String to int or Integer in Java, but there are other scenarios as well when this error occurs. In this article, I am sharing 10 of the most common reasons of java.lang.NumberFormatException in Java programs.

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