API: Application Programming Interface, that is, the jdk documentation manual, which provides many commonly used functions in the form of classes.
Exception: Abnormal situations that occur during program development are exceptions. For example, the divisor is 0, the parameter is null, the member variable or method of the parameter is called, and the array subscript is out of bounds
Exceptions are divided into two types:
(1) ,Exception: What the programmer can solve: null pointer, divisor is 0, array subscript out of bounds
(2), Error: What the programmer cannot solve: such as memory overflow.
Throwable is the parent class of these two types.
Exception classification:
Classified according to whether the compiler checks:
Non-checked exception: also called runtime exception, that is , the compiler does not perform exception checking during syntax checking.
Checked exceptions: also called compile-time exceptions. At this time, the compiler will forcefully check the syntax for exceptions. If there are exceptions, exception handling needs to be done at compile time.
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