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Calling `System.exit` terminates the java process and returns a status code.
Since it is disruptive to shut down the process within library code,
`System.exit` should not be called outside of a main method.
Instead of calling `System.exit` consider throwing an unchecked exception to
signal failure.
For example, prefer this:
```java
public static void main(String[] args) {
try {
doSomething(args[0]);
} catch (MyUncheckedException e) {
System.err.println(e.getMessage());
System.exit(1);
}
}
// In library code
public static void doSomething(String s) {
try {
doSomethingElse(s);
} catch (MyCheckedException e) {
throw new MyUncheckedException(e);
}
}
```
to this:
```java
public static void main(String[] args) {
doSomething(args[0]);
}
// In library code
public static void doSomething(String s) {
try {
doSomethingElse(s)
} catch (MyCheckedException e) {
System.err.println(e.getMessage());
System.exit(1);
}
}
```
|
