JNI:创建HashMap [英] JNI: Create HashMap
本文介绍了JNI:创建HashMap的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在JNI中创建一个HashMap对象?
How do I create a HashMap object in JNI?
推荐答案
这里是代码,您需要修改
Here is code, you will need to modify to work
jclass mapClass = (*env)->FindClass(env, "java/util/HashMap");
if(mapClass == NULL)
{
return NULL;
}
jsize map_len = 1;
jmethodID init = (*env)->GetMethodID(env, mapClass, "<init>", "(I)V");
jobject hashMap = (*env)->NewObject(env, mapClass, init, map_len);
jmethodID put = (*env)->GetMethodID(env, mapClass, "put",
"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
while( ... )
{
jint key = ...;
size_t sz = t->count;
jbyteArray dd = (*env)->NewByteArray(env, sz);
for(i = 0; i < sz; i++)
{
(*env)->SetByteArrayRegion(env, dd, i, 1, *data++);
}
(*env)->CallObjectMethod(env, hashMap, put, key, dd);
(*env)->DeleteLocalRef(env, key);
(*env)->DeleteLocalRef(env, dd);
}
(*env)->DeleteLocalRef(env, hashMap);
(*env)->DeleteLocalRef(env, mapClass);
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