Console Input in Java

This version works:

try {
  BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
  System.out.print("Enter your name: ");
  String name = in.readLine();
} catch (IOException exc) {
  System.out.println("Exception: " + exc.getMessage());
}

A BufferedReader can be connected to any type of input, not just a keyboard
Many input sources often fail when you try to read them with readLine()
- A file may be empty
- A network connection may break
- A keyboard may get unplugged
If the input source fails, then there is no semantics for readLine()'s return value
In this case, Java throws an exception
- If an exception is not "caught", it terminates the program
- There are many exceptions that you may ignore when programming, although they often arise when debugging
  - NullPointerException
  - ArithmeticException
- Some exceptions must be handled; these are called _checked_ exceptions
  - IOException
  - FileNotFoundException
An alternative to console input: JOptionPane
String name = JOptionPane.showInputDialog("Enter your name:");

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