Is it possible to transport data form one class to another?

Question

i mean like there are statics inside a class that i can use in any function so is something like this possible with classes, if yes then how can i do that?

Answer 1

Yes, I do understand.
The first thing to do is to declare what are called accessor methods in you ClassOne, something like this;
public ClassOne {
   private String variableOne = "A simple demo";
   public ClassOne() {
      // Just display a message for now so you know it has been instantiated.
      // In real life, you would use the constuctor to establish the initial
      // state of the object
      System.out.println("ClassOne instantiated.");
   // This is the accessor method. It simply returns the current value of the
   // variable called variableOne. You do not need to use the this prefix, I
   // only did that to make it clear it was returning the state of the
   // instance variable.
   public String getVariableOne() {
      return(this.variableOne);
}Next, lets define ClassTwo to show you how to access the state of a variable in an instance of ClassOne;
public ClassTwo {
   // This is the constuctor for ClassTwo. See that it accepts a single
   // parameter of typr ClassOne. It is possible to call a method on the
   // ClassOne instabce, in this case, it calls getVariableOne() and you
   // should see that it prints out the message 'A simple demo' which was
   // the String we stored into the private instance varibale in ClassOne.
   // Of course, you could store the reference to a variable defined within
   // this class and use it whenever and wherever you wanted to.
   public ClassTwo(ClassOne classOneInst) {
      System.out.println(classOneInst.getVariableOne());
}You need to hook to two instances together something like this;
public class Demo {
   public static void main(String[] args) {
      // Instantiate ClassOne - should see the message to confirm creation
      ClassOne cOneInst = new ClassOne();
      // Instantiate ClassTwo and pass the refernec to the ClassOne
      // instance. Should see it rpint out the contents of ClassOne's single
      // instance variable.
      ClassTwo cTwoInst = new ClassTwo(cOneInst);
}Just as a PS, it is good practice to protect the state of the class by declaring varaibles with the private modifier and exposing only those - using accessor/mutator methods - you really want to client programmer to have access to. This is not a hard and fast rule - Sun do not always protect the classes state in this manner - but it is a wise precaution IMO.