java 面向对象（二十八）：异常 一

//******************以下是运行时异常***************************
    //ArithmeticException
    @Test
    public void test6(){
        int a = 10;
        int b = 0;
        System.out.println(a / b);
    }
    
    //InputMismatchException
    @Test
    public void test5(){
        Scanner scanner = new Scanner(System.in);
        int score = scanner.nextInt();
        System.out.println(score);
        
        scanner.close();
    }
    
    //NumberFormatException
    @Test
    public void test4(){
        
        String str = "123";
        str = "abc";
        int num = Integer.parseInt(str);
        
        
        
    }
    
    //ClassCastException
    @Test
    public void test3(){
        Object obj = new Date();
        String str = (String)obj;
    }
    
    //IndexOutOfBoundsException
    @Test
    public void test2(){
        //ArrayIndexOutOfBoundsException
//        int[] arr = new int[10];
//        System.out.println(arr[10]);
        //StringIndexOutOfBoundsException
        String str = "abc";
        System.out.println(str.charAt(3));
    }
    
    //NullPointerException
    @Test
    public void test1(){
        
//        int[] arr = null;
//        System.out.println(arr[3]);
        
        String str = "abc";
        str = null;
        System.out.println(str.charAt(0));
        
    }

    //******************以下是编译时异常***************************
    @Test
    public void test7(){
//        File file = new File("hello.txt");
//        FileInputStream fis = new FileInputStream(file);
//        
//        int data = fis.read();
//        while(data != -1){
//            System.out.print((char)data);
//            data = fis.read();
//        }
//        
//        fis.close();
        
    }