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Checked vs Unchecked

Checked vs Unchecked

This lesson introduces the type of exceptions.

We'll cover the following...
1.

What are the different types or kinds of exceptions?

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Java
class Demonstration {
    public static void main( String args[] ) {
        print("Code compiles without throws clause for unchecked exceptions.");
    }
    static void print(String str) {
        if (str == null)
            throw new RuntimeException("");
        System.out.println(str);
    }    
}
1.

What are runtime exceptions?

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Java
class Demonstration {
    public static void main( String args[] ) {
        printInt(null);
    }
    // throws NullPointerException
    static void printInt(Number number) {
        System.out.println(number.intValue());
    }
}
1.

What are Error exceptions?

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Java
class Demonstration {
    public static void main( String args[] ) {
        System.out.println( "Hello World!" );
    }
    // Doesn't compile because the checked exception being
    // thrown is checked.
    void uselesslMethod() {
        throw new IOException();
    }
}

Note if the method threw an Error or a ...