What is the importance of getCause() method in Java?

getCause() method comes from Throwable class, we can use this method to return reason Exception or returns null (if the cause of the exception is unknown). getCause() The method does not accept any parameters and does not throw an exception. It returns the cause provided by one of its constructors or determined by the formation of the initCause() method of the Throwable class.

Syntax

public Throwable getCause()

Example

public class GetCauseMethodTest {
   public static void main(String[] args) throws Exception {
      try {
         myException();
      } catch(Exception e) {
         System.out.println("Cause = " + e.getCause());
      }
   }
   public static void myException() throws Exception {
      int arr[] = {1, 3, 5};
      try {
         System.out.println(arr[8]);
      } catch(ArrayIndexOutOfBoundsException aiobe) {
         Exception e = new Exception();
         throw(Exception); <strong>/</strong>/ throwing the exception to be caught by catch block in main()
         e.initCause(aiobe); // supplies the cause to getCause()
      }
   }
}

Output

Cause = java.lang.ArrayIndexOutOfBoundsException: 8

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