In Java, there are three methods to print exception information. All of them are present in the Throwable class. Since Throwable is the base class for all exceptions and errors, we can use these three methods on any exception object.
Methods to Print Exceptions in Java
There are three methods to print exception messages in Java. These are:
1. java.lang.Throwable.printStackTrace() method:
By using this method, we will get the name(e.g., java.lang.ArithmeticException) and description(e.g., / by zero) of an exception separated by a colon, and the stack trace (wherein the code, that exception has occurred) in the next line.
Syntax:
public void printStackTrace()
Java
// Java program to demonstrate// printStackTrace method public class Test { public static void main(String[] args) { try { int a = 20 / 0; } catch (Exception e) { // printStackTrace method // prints line numbers + call stack e.printStackTrace(); // Prints what exception has been thrown System.out.println(e); } }} |
Runtime Exception:
java.lang.ArithmeticException: / by zero
at Test.main(Test.java:9)
Output:
java.lang.ArithmeticException: / by zero
Using this method will only get the name and description of an exception. Note that this method is overridden in the Throwable class.
Java
// Java program to demonstrate// toString method public class Test { public static void main(String[] args) { try { int a = 20 / 0; } catch (Exception e) { // toString method System.out.println(e.toString()); // OR // System.out.println(e); } }} |
java.lang.ArithmeticException: / by zero
3. java.lang.Throwable.getMessage() method:
Using this method, we will only get a description of an exception.
Syntax:
public String getMessage()
Java
// Java program to demonstrate// getMessage method public class Test { public static void main(String[] args) { try { int a = 20 / 0; } catch (Exception e) { // getMessage method // Prints only the message of exception // and not the name of exception System.out.println(e.getMessage()); // Prints what exception has been thrown // System.out.println(e); } }} |
/ by zero
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