What is hierarchy of java.lang.NumberFormatException?
-java.lang.Object
-java.lang.Throwable
-java.lang.Exception
-java.lang.RuntimeException
-java.lang.IllegalArgumentException
-java.lang.NumberFormatException
NumberFormatException is Checked (compile time exceptions) and UnChecked (RuntimeExceptions) in java ?
java.lang.NumberFormatException is a RuntimeExceptions in java.
What is NumberFormatException in java?
java.lang.NumberFormatException is thrown when program attempts to convert a string to numeric types, but that the string is not in the appropriate format.
Scenarios where NumberFormatException may be thrown in java>
String "22" is in appropriate format to be converted into numeric type int. So, NumberFormatException will not be thrown.
public class NumberFormatExceptionExample {
public static void main(String args[]) {
String s = "22";
int i = Integer.parseInt(s);
System.out.println(i);
}
}
/*OUTPUT
22
*/
public class NumberFormatExceptionExample {
public static void main(String args[]) {
String s = "22";
int i = Integer.parseInt(s);
System.out.println(i);
}
}
/*OUTPUT
22
*/
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BUT, In the below program, String "ab" is not in appropriate format to be converted into numeric type int. So, NumberFormatException will be thrown.
public class NumberFormatExceptionExample2 {
public static void main(String args[]) {
String s = "ab";
int i = Integer.parseInt(s);
System.out.println(i);
}
}
/*OUTPUT
Exception in thread "main" java.lang.NumberFormatException: For input string: "ab"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at NumberFormatExceptionExample2.main(NumberFormatExceptionExample2.java:4)
*/
public class NumberFormatExceptionExample2 {
public static void main(String args[]) {
String s = "ab";
int i = Integer.parseInt(s);
System.out.println(i);
}
}
/*OUTPUT
Exception in thread "main" java.lang.NumberFormatException: For input string: "ab"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at NumberFormatExceptionExample2.main(NumberFormatExceptionExample2.java:4)
*/
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Labels:
Core Java
Exceptions