Exceptions in JAVA - RuntimeException

runtime exception in java

/*
 * Exception has a special subclass exception RunTimeException runtime exception
 * If an exception is thrown in the function content, the function can be declared without the declaration, and the compilation will pass
 * If the exception is declared on the function, the caller can not handle it, and the compilation will pass
 *
 The reason * is not declared on the function is because it does not need to be handled by the caller.
 * When this exception occurs, I hope that the program will stop, because when running, there is a situation where the operation cannot be continued. I hope that the code will be corrected after the program is stopped.
 *
 * When a custom exception occurs, if the exception occurs, the operation cannot continue
 * Let the custom exception inherit RunTimeException
 *
 * There are two types of exceptions:
 * 1. Exceptions detected at compile time
 * 2. Exceptions that are not detected at compile time (runtime exceptions, RunTimeException and its subclasses)
 *
 *
 * */

class Demo3{
	int div(int a,int b){
		if(b==0){
			throw new ArithmeticException("Division by zero");
		}
		return a/b;
	}
}

public class ExceptionDemo3 {
	public static void main(String args[]){
		Demo3 d=new Demo3();
		int x= d.div(4, 1);
		System.out.println("x="+x);
		System.out.println("over");
	}
}

                                                                                     ----------------------By chick