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Exception Handling

• Example: NullPointerException
  String name = null;
int n = name.length(); // ERROR
• Cannot apply a method to null
• Virtual machine throws exception
• Unless there is a handler, program exits with stack trace
  Exception in thread "main" java.lang.NullPointerException
at Greeter.sayHello(Greeter.java:25)
at GreeterTest.main(GreeterTest.java:6)

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