Java exception exit condition judgment example code

Whether functional code or algorithmic code, the program is a collection of a series of processes

Since it is a process, it is divided into: general process and abnormal process;

The general process ensures the basic functions;

The abnormal process is the guarantee of program stability, and the project cannot hang up because of some illegal input;

Note that the order of Boolean expressions is sometimes not interchangeable

0. Common abnormal exit conditions

The parameter is null;

Indicates the length, indicates that the integer of the index is negative, or exceeds the range of the array or container to be indexed;

1. Startswith function of string

First, let's look at the external interface provided by the string class for the startswith function. There are two function overloads in the following forms:

The meanings of the parameters passed in are: prefix: the string to be matched, toffset the offset at the beginning of the comparison of the current string. For the parameters, the following conditions should be met:

toffset >= 0； this. value. length >= prefix. length + toffset

That is:

The complete source code is as follows:

summary

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