in java how to throw exception from function
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
}
}Java The Throw/Throws Keyword
//f a method does not handle a checked exception, the method must declare it using the throws keyword. The throws keyword appears at the end of a method's signature.
One can throw an exception, either a newly instantiated one or an exception that you just caught, by using the throw keyword.
Understand the difference between throws and throw keywords, throws is used to postpone the handling of a checked exception and throw is used to invoke an exception explicitly.
Example
import java.io.*;
public class className {
public void deposit(double amount) throws RemoteException {
// Method implementation
throw new RemoteException();
}
// Remainder of class definition
}throw error java
throw new java.lang.Error("this is very bad");
throw new java.lang.RuntimeException("this is not quite as bad");java throw an exception
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");
}
}java throws exception on method
static void testMethod() throws Exception {
String test = null;
test.toString();
}Copyright © 2021 Codeinu
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