throw io exception java
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());
}
}importance of throws keyword in java
Throws statement is used at the end of method signature to indicate that
an exception of a given type may be thrown from the method.
The main purpose of throws keyword is to delegate responsibility of
exception handling to the caller methods, in the case of checked exception.
In the case of unchecked exceptions, it is not required to use throws keyword.
We can use throws keyword only for throwable types otherwise compile time error
saying incompatible types.
An error is unchecked, it is not required to handle by try catch or by throws.
Syntax : Class Test{
Public static void main(String args[]) throws IE{
}}
The method should throw only checked exceptions and subclasses
of checked exceptions. It is not recommended to specify exception
superclasses in the throws class when the actual exceptions thrown in
the method are instances of their subclass.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
}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");
}
}throwing exceptions 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..");
}
}java throws exception on method
static void testMethod() throws Exception {
String test = null;
test.toString();
}Copyright © 2021 Codeinu
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