????Java??????????????checked????unchecked?????????з??????????
???????????checked?????????й????л???????unchecked?????????????????
????checked????
?????????Ч??????????п??????????????Ч????????????????????????????????????????Щ?????????????????????????????????
????????????????????????????try-catch?鴦????????????????????throws????????????????????????
?????????java.lang.Exception??java.lang.RuntimeException??????
????unchecked????
?????????????????????????RuntimeException??????????IllegalArgumentException?? NullPointerException??IllegalStateException??
????????????????????????unchecked?????????
?????????java.lang.RuntimeException????java.lang.RuntimeException?????java.lang.Exception????
????Java?е?checked????????????????????try-catch??????????????????????????????????????????????????????????? ?????????????????????????????д??????catch?飬?????????????????Щ?????“??a”???????????????鷳?????????????????????? ???????checked???????????????catch?????????壬????checked??????Java????????????C#?????checked ???????C#?в????????????????
????Java?????????????????????????????????
????checked???????????????????????????п??????????????Java??API?????????????Щ?????????????????????????????????????????????????????????????????????Щ????
????????????????
????1. checked??
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
public class Main {
public static void main(String[] args) {
File f = new File("C: est.txt");
FileReader r = new FileReader(f); //A
BufferedReader br = new BufferedReader(r);
br.readLine(); //B
br.close(); //C
}
}
??????δ?????????????????A??B??C?л????IOException????????δ??????try-catch???У??????main????????throws IOException???????
????2. unchecked??
????public class Main {
????public static void main(String[] args) {
????int a = 0;
????int b = 100;
????int c = b/a;
????}
????}
???????????????л???
????Exception in thread “main” java.lang.ArithmeticException: / by zero
????at Main.main(Main.java:13)
????ArithmeticException?????unchecked????