Integer和Object间的转换

public class Integer_Object {

public static void main(String[] args){
    Object obj = new ooo();

// Integer i = (Integer) obj;
Integer i = Integer.parseInt(obj.toString());
System.out.println(i);
}
}
class ooo{
public String toString(){
return 1+"";
}
}

上述转换中：注释掉的为错误的转换