public class TestException {
    public static void main(String[] args) {
        Object obj = new Integer(1);
        int i =(Integer)(obj);
        System.out.println(i);
        
        Object object = new Object();
        if (object instanceof Integer){
            System.out.println(true);
        }
        int j = (Integer)object;
        System.out.println(j);
    }
}
 

1
Exception in thread "main" java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.Integer
    at TestException.main(TestException.java:8)

2類型轉換異常：Exception in thread "main" java.lang.ClassCastException:java.lang.Object cannot be cast to java.lang.Integer