#include "myAppend.h"
#include <string.h>


JNIEXPORT jstring JNICALL
Java_Str_myAppend (JNIEnv *env, jobject host, jstring a)
{  char buf[64]={'\0'};
   jclass cls = (*env)->GetObjectClass(env, host);
   const char* str_a = (*env)->GetStringUTFChars(env, a, 0);
   jfieldID fid = (*env)->GetFieldID(env, cls, "str1", "Ljava/lang/String;");
   jstring b = (*env)->GetObjectField(env, host, fid);
   const char* str_b = (*env)->GetStringUTFChars(env, b, 0);
   strcat(buf,str_b);
   strcat(buf,str_a);
   (*env)->ReleaseStringUTFChars(env, a, str_a);
   (*env)->ReleaseStringUTFChars(env, b, str_b);
   a = (*env)->NewStringUTF(env, buf);
   (*env)->SetObjectField(env, host, fid, a);
   return a;
}