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package chapter09;
/*
public class Snippet {
// VariableReferenceEx1.cpp
// Example of using reference in C++
#include <iostream>
using namespace std;
int main()
{
cout << "Hello world!" << endl;
int x= 10, y = 100; // variable declaration
int & j= x; // j is a reference declaration;
// j reference to variable "x"
//int & k = 100; // is NOT valid
cout << "Variable x = " << x << endl;
cout << "Address of variable x, &x = " << &x << endl;
cout << "Reference j = " << j << endl;
cout << "Address of reference j, &j = " << &j << endl;
cout << "&j + 1 = " << &j+1 << endl;
return 0;
}
}
*/
public class Snippet {
//CallByValueEx1.cpp
#include <iostream>
using namespace std;
int CallByValue(string ); // Function with a variable argument
int main() {
string myname = "Mahdi"; // myname is a local variable
cout << "Initially, inside main(), Name = " << myname << endl;
CallByValue(myname);
cout << "After calling CallByValue(), Name = " << myname << endl; // Look here ??!!??
cout << endl ;
cout << "Now, inside main(), Name = " << myname << endl;
return 0;
}
int CallByValue(string newname ) // newname is a parameter (local variable) here
{
newname = "Mahdi Munim";
cout << "Inside CallByValue(), Name = " << newname << endl;
return 0;
}
//CallByRefEx1.cpp
//CallByRefEx1.cpp
#include <iostream>
using namespace std;
int CallByRef(string& ); // Function with a reference argument
int main() {
string myname = "Mahdi"; // myname is a local variable
cout << "Initially, inside main(), Name = " << myname << endl;
CallByRef(myname);
cout << "After calling CallByRef(), Name = " << myname << endl; // Look here ??!!??
cout << endl;
cout << "Now, inside main(), Name = " << myname << endl;
return 0;
}
int CallByRef(string& newname ) // newname is a reference here
{
newname = "Mahdi Munim";
cout << "Inside CallByRef(), Name = " << newname << endl;
return 0;
}
/* NativeMe.cpp */
/* This Program define body of the Native Method */
#include<jni.h> //From jdk1.3\include
#include<NativeMe.h> //From Current Directory
#include<stdio.h> //From Included Directory
JNIEXPORT void JNICALL Java_NativeMe_test(JNIEnv *env, jobject obj)
{
jclass cls;
jfieldID fid;
jint i;
cout<<"\tLoading the native method....." <<endl;
cls = (*env)->GetObjectClass(env, obj);
fid = (*env)->GetFieldID(env, cls, "i", "I");
if(fid ==0)
{
cout<<"Could not found get field!" <<endl;
return;
}
i = (*env)->GetIntField(env, obj, fid);
cout<<"Inside the test() Before Changing i = << i << endl;
(*env)->SetIntField(env, obj, fid, i*2);
cout<<"Inside the test() After Changing i = << i << endl;
cout<<"\tEnding the native method....." <<endl;
}
}