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());
}
}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
}
}throw keyword in java
Generally JVM throws the exception and we handle the exceptions by
using try catch block. But there are situations where we have to throw
userdefined exceptions or runtime exceptions. In such case we use throw keyword
to throw exception explicitly.
Syntax : throw throwableInstance;
Throwable instance must be of type throwable or any of its subclasses.
After the throw statement execution stops and subsequent statements are not
executed. Once exception object is thrown JVM checks is there any catch
block to handle the exception. If not then the next catch statement till it
finds the appropriate handler. If appropriate handler is not found,
then default exception handler halts the program and prints the description
and location of exception. In general we use throw keyword for throwing
userdefined or customized exception.Copyright © 2021 Codeinu
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