java几种常见运行时异常及简单例子

╰+攻爆jí腚メ 2023-06-18 12:55 8阅读 0赞

java几种常见运行时异常及简单例子

1、java.lang.IndexOutOfBoundsException
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<String>();
        list.get(0);
    }
    Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.ArrayList.rangeCheck(ArrayList.java:653)
        at java.util.ArrayList.get(ArrayList.java:429)
        at test.demo.ExceptionCheck.main(ExceptionCheck.java:9)
    
    2、java.lang.NullPointerException
    public static void main(String[] args) {
            ArrayList<String> list = null;
            System.out.println(list.get(0));
        }
    Exception in thread "main" java.lang.NullPointerException
        at test.demo.ExceptionCheck.main(ExceptionCheck.java:9)
    
    3、java.lang.ArithmeticException
    public static void main(String[] args) {
        int dividend = 1;
        int divisor = 0;
        System.out.println(dividend / divisor);
    }
    Exception in thread "main" java.lang.ArithmeticException: / by zero
        at test.demo.ExceptionCheck.main(ExceptionCheck.java:10)
    
    4、java.lang.NumberFormatException
    public static void main(String[] args) {
        String source = "123s";
        Integer result = new Integer(source);
        System.out.println(result.intValue());
    }
    Exception in thread "main" java.lang.NumberFormatException: For input string: "123s"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:580)
        at java.lang.Integer.<init>(Integer.java:867)
        at test.demo.ExceptionCheck.main(ExceptionCheck.java:9)
    
    5、java.lang.ClassCastException
    public static void main(String[] args) {
        Object x = new String("String");
        System.out.println((Integer) x);
    }
    Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
        at other.demo.ExceptionCheck.main(ExceptionCheck.java:7)
    
    6、java.lang.ArrayStoreException
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<Integer>();
        list.add(12);
        list.add(13);
    
        list.toArray(new Long[list.size()]);
    }
    Exception in thread "main" java.lang.ArrayStoreException
        at java.lang.System.arraycopy(Native Method)
        at java.util.ArrayList.toArray(ArrayList.java:408)
        at other.demo.ExceptionCheck.main(ExceptionCheck.java:13)