Throwable toString() method in Java with Examples

The toString() method of Java.lang.Throwable class used to return a String representation of this Throwable which consists of the name of the class of this object, a colon and a space(“: “) and a string which is same as result of invoking this object’s getLocalizedMessage() method and If getLocalizedMessage returns null, then just the class name is returned.

Syntax:

public String toString()

Return Value: This method returns String representation of this Throwable if a Exception occurs.

Below programs illustrate the toString() method of Throwable class:

Example 1:



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// Java program to demonstrate
// the toString() Method.
  
import java.io.*;
  
class GFG {
  
    // Main Method
    public static void main(String[] args)
        throws Exception
    {
  
        try {
  
            testException();
        }
  
        catch (Throwable e) {
  
            // print using tostring()
            System.out.println("Exception: "
                               + e.toString());
        }
    }
  
    // method which throws Exception
    public static void testException()
        throws Exception
    {
  
        throw new Exception("New Exception Thrown");
    }
}

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Output:

Exception: java.lang.Exception: New Exception Thrown

Example 2:

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// Java program to demonstrate
// the toString() Method.
  
import java.io.*;
  
class GFG {
  
    // Main Method
    public static void main(String[] args)
        throws Exception
    {
        try {
  
            // divide two numbers
            int a = 4, b = 0;
  
            int c = a / b;
        }
        catch (Throwable e) {
  
            // print using tostring()
            System.out.println("Exception: "
                               + e.toString());
        }
    }
}

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Output:

Exception: java.lang.ArithmeticException: / by zero

References:
https://docs.oracle.com/javase/10/docs/api/java/lang/Throwable.html#toString()



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