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Showing content from https://www.tutorialspoint.com/java/lang/thread_setdefaultuncaughtexceptionhandler.htm below:

Java Thread setDefaultUncaughtExceptionHandler() Method

The Java Thread setDefaultUncaughtExceptionHandler() method set the default handler invoked when a thread abruptly terminates due to an uncaught exception, and no other handler has been defined for that thread.

Following is the declaration for java.lang.Thread.setDefaultUncaughtExceptionHandler() method

public static void setDefaultUncaughtExceptionHandler(Thread.UncaughtExceptionHandler eh)

eh − This is the object to use as the default uncaught exception handler. If null then there is no default handler.

This method does not return any value.

SecurityException − if a security manager is present and it denies RuntimePermission

The following example shows the usage of Java Thread setDefaultUncaughtExceptionHandler() method. In this program, we've created a thread class AdminThread by implementing Runnable interface. In run method, we're throwing a RuntimeException. In main method, we've created a new thread of AdminThread class and using setDefaultUncaughtExceptionHandler() method, we've set a default uncaught exception handler which prints the exception raised.

Using start() method, we've started the thread and result is printed on the console.

package com.tutorialspoint;

public class ThreadDemo {

   public static void main(String[] args) {
  
      Thread t = new Thread(new adminThread());
 
      t.setDefaultUncaughtExceptionHandler(new Thread.
      UncaughtExceptionHandler() {
         public void uncaughtException(Thread t, Throwable e) {
            System.out.println(t + " throws exception: " + e);
         }
      });
      // this will call run() function
      t.start();
   }
}

class adminThread implements Runnable {

   public void run() {
      throw new RuntimeException();
   }
} 

Let us compile and run the above program, this will produce the following result −

Thread[#21,Thread-0,5,main] throws exception: java.lang.RuntimeException

java_lang_thread.htm

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