Exception Handling - Java

• Throws by compiler at compile time
• Eg = FileNotFoundException

• Throws by compiler at run time
• Eg = NullPointerException, ArithmeticException, IllegalArgumentException, IndexOutOfBoundsException, IllegalStateException

• Eg = StackOverFlowError, OutOfMemoryError

Try & Catch => By Developer

  try {
    statement;
  } catch (ExceptionName var) {
    var.printStackTrace();
    var.getMessage();
  } finally {
    // Used to release Extra resources
  }

User Defined => You as a designer would like to throw exception to instruct the developer to handle if really wants, Stops the program

  // App.java
  public static int functionName() throws InputException {
    if (condition) throw new ExceptionName("")
    else statement;
  }

  // ExceptionName.java
  public class ExceptionName extends Exception {
    public ExceptionName(String msg) {
      super(msg);
    }
  }