java - 两次初始化: Object x = new String(); String x = new String();有什么区别

Question

两种初始化有什么区别:

Object x = new String(); 
String x = new String();

在java中

谢谢!

Answer 1

Object x = new String(); // pointing to a String and saying - Hey, Look there! Its an Object
 String x = new String();// pointing to a String and saying - Hey, Look there! Its a String

更重要的是:可以访问的 String 的方法取决于引用。例如:

public static void main(String[] args) {
    Object o = new String();
    String s = new String();
    o.split("\\."); // compile time error
    s.split("\\."); // works fine

}