[Java] Exception instance

Use of exception instances

try{
} catch(Exception e) {
    System.out.println(e.getMessage());
}
```

#### Methods that exception instances always have
 |Method|meaning|
 |---|---|
 |String getMessage()  |Get error messages.|
 |void printStackTrace()  |The contents of the stack trace are displayed on the screen.|
e.g. `e.printStackTrace();`


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