Exception vs System.exit(0)

Question

Hi, I just learned about the exception, but I am thinking what is the advantage of using Exception vs the System.exit(0).

For example:

public void fill(int num2) {
    int maxNum =  num + num2;
    if (maxNum > 15)
        throw new IllegalArgumentException("Too big!");
}

vs

public void fill(int num2) {
    int maxNum = num + num2;
    if (maxNum > 15) {
        System.out.println("Too big");
        System.exit(0);
}

}

and in the main function, not using the try keyword and implement as normal. can someone tell me the advantage of using exception thanks.

Answer 1 · 2017-10-29T20:23:27Z

October 29, 2017 8:23pm

Hi there, when we use System.exit the program will terminate automatically when it reaches that line. In larger and more complex programs this is rarely what we want. Suppose you were using a calculator program, and when you accidentally typed in a letter instead of a number the program just automatically closed! Not good. Instead we use the IllegalArgumentException so that later on in the code we are able to catch this. This way the program does not just unexpectedly close, but rather states an error ("Please enter a Number!"), and than lets the user try again. This is considered a better result than having the program terminate!

Good luck and happy coding!

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disheng wang

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Exception vs System.exit(0)

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