Problem Translate c code into java

[keet]

Hello I have to 'translate' a code into a java code.
Now I have the some problems:

In the c code memcpy is used en I found something about how to use memcpy.
Can someone help me width this because I don' t know how I have to use it.
http://www.garret.ru/~knizhnik/cons...s/AnyArray.html

I tried this

public class memcpy 
{ 
    Obj String1; 
    Obj String2; 
 
public memcpy() 
    { 
    String1 = new Obj(); 
    String2 = new Obj(); 
         
    String1.value="Hallo wat is het toch weer mooi weer vandaag"; 
    String2.value="Hallo wat is het stom weer vandaag"; 
     
    //System.out.println(String1.value); 
//    System.out.println(String2.value); 
    memcpy(String1.value,3,String2.value,5,13); 
    System.out.println(String1.value); 
    }     
 
class Obj 
    { 
    public String value; 
    } 
 
public void memcpy(java.lang.Object dst, int dstPos,java.lang.Object src, int srcPos, int n) 
    { 
  //  System.out.println(String1); 
    } 
      
    public static void main(String[] args) 
    { 
    new memcpy(); 
    } 
}public class memcpy 
{ 
    Obj String1; 
    Obj String2; 
 
public memcpy() 
    { 
    String1 = new Obj(); 
    String2 = new Obj(); 
         
    String1.value="Hallo wat is het toch weer mooi weer vandaag"; 
    String2.value="Hallo wat is het stom weer vandaag"; 
     
    //System.out.println(String1.value); 
//    System.out.println(String2.value); 
    memcpy(String1.value,3,String2.value,5,13); 
    System.out.println(String1.value); 
    }     
 
class Obj 
    { 
    public String value; 
    } 
 
public void memcpy(java.lang.Object dst, int dstPos,java.lang.Object src, int srcPos, int n) 
    { 
  //  System.out.println(String1); 
    } 
      
    public static void main(String[] args) 
    { 
    new memcpy(); 
    } 
}

My other problem is that the c code contains pointers but I don't know how I have to translate the code and it does the same in my java code as in the c code.

Here's a little part

unsigned long random(unsigned long v)
 {
 unsigned char *ptr;
 ptr = (unsigned char *)&v
 etc.
 }
 
 unsigned long composiet;
 unsigned char *ptr;
 ptr = (unsigned char *)&composiet
 random(composiet);

[JGRobinson]

Hi,

there is no equivalent to memcpy in Java and nor should there be.

memcpy is used in C/C++ to quickly copy areas of memory from one place to another.

You have a similar problem with pointers - they directly access memory ready for maniplulation.

You need to understand what the C code is trying to do and rewrite this logic in Java - do not attempt to port it line for line as it generally won't work and you'll go mad in the process.

C and Java may look similar, but are very different languages to code in, primary due to the java sandbox which does not allow direct memory manipulations.