Java custom exception class
In this chapter you will learn:
Description
You can create your own exception class by defining a subclass of Exception.
The Exception class does not define any methods of its own.
It inherits methods provided by Throwable.
Example
The following program creates a custom exception type.
class MyException extends Exception {
private int detail;
//from w ww . j av a2 s . c om
MyException(int a) {
detail = a;
}
public String toString() {
return "MyException[" + detail + "]";
}
}
public class Main {
static void compute(int a) throws MyException {
System.out.println("Called compute(" + a + ")");
if (a > 10)
throw new MyException(a);
System.out.println("Normal exit");
}
public static void main(String args[]) {
try {
compute(1);
compute(20);
} catch (MyException e) {
System.out.println("Caught " + e);
}
}
}
The code above generates the following result.
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What you will learn in the next chapter: