java contorller调用service 命名规范

Exception继承了Throwable，但是它本身是有异常类的父类。
RuntimeException：运行时异常
Exception->RuntimeException->NullPointException
Exception->RuntimeException->IndexOutOfBoundsException->ArrayIndexOfboundsException
public class Test {
String x;
public static void main(String[] args) {
Test test = new Test();
try {
System.out.println(test.x.length());
} catch (ArrayIndexOutOfBoundsException e) {
test.x = "hello world";
System.out.println(test.x.length());
} catch (NullPointerException e) {
// TODO: handle exception
test.x = "hello world";
System.out.println(test.x.length());
} catch (Exception e) { // 必须放到最后
// TODO: handle exception
e.printStackTrace();
}
System.out.println("end");
}
}
11
end