Java exception Exercise 2

| - demand explanation

| - realization of ideas

1, create a subclass of Exception, for throwing an exception

2, to create a class used to collect user data collection and age determination

3, create a test class, which is written try - catch statement

 

| - Content Code

. 1  public  class NumException the extends Exception {
 2      // create a subclass of Exception, NumException for the job type of an abnormality 
. 3      public NumException (String Message) {
 . 4          Super (Message);
 . 5          System.err.println ( "data entry errors " );
 6      }
 7 }

Exception subclasses, for throwing an exception

 1 public class AgeJuge {
 2     private int age;
 3 
 4     public int getAge() {
 5         return age;
 6     }
 7 
 8     public void setAge(int age) throws NumException {
 9         if (age > 100 || age < 0) {
10             throw new NumException("年龄必须在0-100之间");
11         } else {
12             this.age = age;
13         }
14     }
15 }

Age judge

 1 public class AgeTest {
 2     public static void main(String[] args) {
 3         Scanner sc = new Scanner(System.in);
 4         AgeJuge age = new  AgeJuge();
 5         System.out.println("请输入年龄");
 6         try {
 7             age.setAge(sc.nextInt());
 8         } catch (NumException e) {
 9             e.printStackTrace();
10         }
11     }
12 }

Test category

 

| --- operating results