Java throw

Java throws

• The throws keyword in Java is used to declare an exception. It alerts the programmer to the possibility of an exception occurring. As a result, it is preferable for the programmer to provide exception handling code so that the program's normal flow can be maintained.


• Exception Handling is used primarily to handle checked exceptions. If an unchecked exception occurs, such as a NullPointerException, it is the fault of the programmer for not checking the code before it is used.


• The throws keyword provides information about the exception to the method's caller.

Example of throw keyword

public class Main {	
    void fun(){
    	try {
            System.out.println("fun() method ");
            throw new NullPointerException();
		}
    	catch (NullPointerException  e){
            throw e;  
		}
  }
  public static void main(String args[]){
      try{
          Main main=new Main();
          main.fun();
      }
      catch(NullPointerException e){
          System.out.println("Caught in the main method");
      }
  }
}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	Unhandled exception type InterruptedException

	at HELLO/DockerTpoint.Main.main(Main.java:5) 

The program's execution comes to a halt right after the throw statement is executed. It then checks the closest try block to see if there is a catch statement that matches the type of exception. If a match is found, control is transferred to that catch statement. If no match is found, it moves on to the next enclosing try block and repeats the process. This continues until a matching catch is found or, if none is found, the default exception handler stops the program.

Example of throws Keyword

Example of throws keyword in java

package DockerTpoint;
public class Main {	
    public static void main(String args[])throws InterruptedException{    	  		  
        Thread.sleep(1000);
        System.out.println("Hello DockerTpoint");
   } 
}

Hello DockerTpoint 

We handled the InterruptedException in the preceding program by using the throws keyword, and the output is Hello DockerTpoint.

Difference Between throw and throws in Java

Difference Between throw and throw in Java are mention below

Key Difference throw and throws in Java

• The throw keyword is used to declare checked exceptions that a method may throw, while throws is used in the method declaration to explicitly throw an exception. throw is used within a method body, while throws is used in the method signature.
• The throw keyword is typically used for immediate handling of exceptions within the method itself, while the throws keyword allows the method to pass the responsibility of handling the exception to its caller method.
• Additionally, the throw keyword can throw both checked and unchecked exceptions, while the throws keyword is mainly used for declaring and propagating checked exceptions.