我今天一直很困惑,因为(简化的)python代码似乎引发了一个异常
以下是python中的代码:
class AwinBaseOperator:
def __init__(self):
self.data = self.get_data(query_url='test')
def get_data(self, query_url):
print('Parent called with ', repr(query_url))
class AwinTransactionOperator(AwinBaseOperator):
def __init__(self):
super().__init__()
def get_data(self):
print('Child called')
print(AwinTransactionOperator())
这将返回:Child called with 'test.'
这意味着代码试图在AwinBaseOperator
构造函数中使用子类的get_data
,这应该是错误的。所以我试图通过将代码翻译成Java并运行它来确认这种行为是不正常的
以下是相关的Java代码:
我创建了一个项目,它的结构就是这样
--- Project
|---src
|---Main.java // Contains the main function call
|---Awin
|---AwinBaseOperator.java
|---AwinTransactionOperator.java
下面是各自的类定义
import Awin.AwinTransactionOperator;
public class Main {
public static void main(String[] args) {
AwinTransactionOperator a = new AwinTransactionOperator();
}
}
package Awin;
public class AwinBaseOperator{
public AwinBaseOperator(){
this.getData("test");
}
public void getData(String query_url){
System.out.println("Parent called getData with "+query_url);
}
}
package Awin;
import Awin.AwinBaseOperator;
public class AwinTransactionOperator extends AwinBaseOperator{
public AwinTransactionOperator(){
super();
}
public void getData(){
System.out.println("Child called getData");
}
}
返回Parent called getData with test.
Java中显示的示例没有显示
Overriding
的用法,而是显示Overloading
方法getData
的用法一旦我们将
AwinTransactionOperator.getData
的签名更改为输出为
Child called getData with test
Python不支持重载
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