Jython：检查 Java 对象类型

Question

I have two Java classes Foo and FooBar under some package. Both of these classes implement interface FooIFC. I want to find if the instance is of type Foo or FooBar from a Jython script.

I have a static getinstance() in one of the base class(implementors) of IFC

from package import FooIFC
from package import Foo

if FooIFC.getinstance() instanceof Foo:
    print "Foo"
else:
     print "FooBar"

I also tried isintance(FooIFC.getinstance(), Foo) as well . Which give an error name not found.

instanceof give expecting colon error.

How do I find the object type from a python script?

Answer 1

There is no instanceof operator in python, instead there is the isinstance (that is isin tance) builtin function. Thus:

from package import FooIFC
from package import Foo

if isinstance(FooIFC.getinstance(), Foo):
    print "Foo"
else:
    print "FooBar"

Answer 2

In Jython , you can also try.

from package import FooIFC
from package import Foo

if FooIFC.getClass().getSimpleName() == 'Foo':
    print "Foo"
else:
    print "FooBar"

Sample Code:

import java.util.ArrayList as ArrayList

arr = ArrayList()
arr.add(10)
arr.add(20)
print arr
print "Name:", arr.getClass().getName()
print "Simple Name:", arr.getClass().getSimpleName()

if arr.getClass().getName() == 'java.util.ArrayList':
    print "This is an ArrayList"

if arr.getClass().getSimpleName() == 'ArrayList':
    print "This is an ArrayList"

Output:

> jython check_type.py
[10, 20]
Name: java.util.ArrayList
Simple Name: ArrayList
This is an ArrayList
This is an ArrayList