Java Throwable getCause() method

It is used to fetch the cause of the Throwable or null if cause can't be determined. This function fetches the cause that was supplied by one of the constructors or that was set after creation with the initCause(Throwable) method. All the PrintStackTrace methods invoke getCause() method to determine the cause of the Throwable.

Syntax

Return

It returns the cause of the Throwable or null if cause can't be determined.

Example 1

import java.io.IOException;
public class ThrowablegetCauseExample1 {
    public static void main(String[] args) throws Exception {
   try{
       throwableTest();
   }catch(Exception e){
    System.err.println("Cause : "+e.getCause());   
   }
   }
public static void throwableTest() throws Exception{
        try{
       int i=4/0;
   }catch(ArithmeticException ae){
      IOException ioe = new IOException();
       throw (IOException)
             ioe.initCause(ae);
    }
}
}

Test it Now

Output:

Cause : java.lang.ArithmeticException: / by zero

Example 2

import java.lang.Throwable;
public class ThrowablegetCauseExample2 {
    public static void main(String[] args) throws Throwable {
   try{
       int i=4/0;
   }catch(Throwable e){
       e.printStackTrace();
       System.err.println("Cause : "+e.getCause());

   }
}
}

Test it Now

Output:

java.lang.ArithmeticException: / by zero
	at ExceptionTest.main(ExceptionTest.java:5)
Cause : null

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Java Throwable class