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Java basics

throw


The throw keyword is used to raise an exception. The throw statement takes a java.lang.Throwable as an argument. The Throwable is propagated up the call stack until it is caught by an appropriate catch block. Any method that throws an exception that is not a RuntimeException must also declare the exceptions it throws using a throws modifier on the method declaration.

Syntax:
class1 throw exception()
{
}


Example:

public Object pop() {
    Object obj;

    if (size == 0) {
        throw new EmptyStackException();
    }

    obj = objectAt(size - 1);
    setObjectAt(size - 1, null);
    size--;
    return obj;
}


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