lanzar una excepción en el ejemplo de código java

Esta es la respuesta más exacta que encomtrarás compartir, pero obsérvala pausadamente y valora si se adapta a tu proyecto.

Ejemplo 1: lanzar excepción java io

public static void foo() throws IOException 
    // some code here, when something goes wrong, you might do:
    throw new IOException("error message");


public static void main(String[] args) 
    try 
        foo();
     catch (IOException e) 
        System.out.println(e.getMessage());
    

Ejemplo 2: en java cómo lanzar una excepción de la función

public void doChangePin(int oldPin, int pin) throws Exception 	//need to add throws followed by exception name
		if (oldPin == pinCode) 
			pinCode = pin;
		 else 
			throw new Exception("some message");	//throwing the exception by creating its new object
		
	

Ejemplo 3: java cómo lanzar una excepción

public class ThrowException
  public static void main(String [] args) throws Exception 
    //throws Exception line is needed if not using try-catch block
    throw new Exception("Errmessage");
  

Ejemplo 4: lanzar excepciones java

/* In this program we are checking the Student age
 * if the student age<12 and weight <40 then our program 
 * should return that the student is not eligible for registration.
 */
public class ThrowExample 
   static void checkEligibilty(int stuage, int stuweight) 
      if(stuage<12 && stuweight<40) 
         throw new ArithmeticException("Student is not eligible for registration"); 
      
      else 
         System.out.println("Student Entry is Valid!!"); 
      
    

   public static void main(String args[]) 
     System.out.println("Welcome to the Registration process!!");
     checkEligibilty(10, 39); 
     System.out.println("Have a nice day.."); 
  

Ejemplo 5: java lanza una excepción

public static void main(String[] args) 
	Scanner kb = new Scanner(System.in);
    System.out.println("Enter a number");
    try 
    	double nb1 = kb.nextDouble();
    	if(nb1<0)
        	throw new ArithmeticException();
        else System.out.println( "result : " + Math.sqrt(nb1) );
     catch (ArithmeticException e) 
        System.out.println("You tried an impossible sqrt");
    

Ejemplo 6: lanzar error java

throw new java.lang.Error("this is very bad");
throw new java.lang.RuntimeException("this is not quite as bad");

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