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Different Ways to Print Exception Messages in Java

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  • Difficulty Level : Easy
  • Last Updated : 06 Dec, 2021

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

2. toString() method

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);
        }
    }
}
Output
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);
        }
    }
}
Output
/ by zero

This article is contributed by Gaurav Miglani. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.


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