a925177652的博客

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">   4.0.0   com.maven   myMaven   0.0.1-SNAPSHOT   jar   myMaven   http://maven.apache.

public static void main(String[] args) throws HttpException, IOException { System.setProperty("http.proxySet", "true");  System.setProperty("http.proxyHost", "127.0.0.1");  System.setProperty("http

Insect i=new Beetle();//向下造型  得到子类实例  类型是父类  所以只包含父类属性Beetle b=(Beetle)i;  //向上造型 得到父类实例  类型为子类  总结:能否向上造型取决于实例化的类...

no suitable constructor found, can not deserialize from Object value (missing default constructor or creator, or perhaps need to add/enable type information?) xxxObject ob= ob.readValue(orderData, x...