Exceptions

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Exceptions provide an error handling mechanism 

try {
    System.out.println(a/b);
} catch (ArithmeticException e) {
    System.out.println("Had a problem!");
}
Exceptions propagate upwards until a catch block gets them

Can throw exceptions: 

throw new ArithmeticException();
Can have multiple catch blocks: 
try {
} catch (IOException e) {
} catch (ArithmeticException e) {
} catch (Exception e) { // most general exception
}
Methods must specify exceptions they throw 
public Foo() throws IOException { ... }