Problem reading objects

My professor has given us a project and three classes that he has written. We are to impliment a 4th class, "Sprite" in order to work with the other classes. He has given us UML for the class and I have implimented this as well. (The UML picture is attached). For some reason I keep getting errors around myPicture and Picture later in the code. especially
myPicture.getX() or getY() methods.

Can someone please tell me what I am doing wrong? We don't need to change the other classes he has given us at all, he said we shouldnt even have to look at them if we dont want to. So then i dont understand why im getting those two errors in multiple places. "myPicture" and "Picture" are having issues. Can anyone point out my problem? thanks

 

Here is my code:

Code:

import java.util.Random; //initialize random object 

  

public class Sprite { //claim the class 
private int xPos; //declare instance variable to be used throughout the class 
private int yPos; 
private Random positioner; //declare a random variable 
private Picture myPicture; //declare a picture variable 

  

public Sprite(Picture pict){ 

Random chooseValue = new Random(); //Create random object "ChooseValue" 
myPicture = pict; //Copy constructor 
positioner = chooseValue; //Object is randomized 
myPicture.getX(); //randomly obtain an x 
myPicture.getY(); //randomly obtain a y 

} 


  

public Sprite(Sprite other){ 
this.xPos = other.xPos; //Take value of xpos from other sprite 
this.yPos = other.yPos; //take value of ypos from other sprite 
this.positioner = new Random(); //positioner can't be copied 
this.Picture = new Picture(other.Picture); //copy constructor 

} 


  

public String toString(){ 
return "Sprite - location: " + xPos + "," + yPos + " picture: " + Picture; 

} 


  

public boolean equals(Sprite other){ 
if (this==other) //if this object is the same object 
return true;//its the same object 
else 
	return false;      //otherwise it's not
}



  

public int getX(){ //Obtain xPos 
int chooseValue = positioner.nextInt(76); //randomly choose a number from 0-75 
xPos = chooseValue; //assign xPos to that value. 
return xPos; //return xPos as that value 
} 


  

public int getY(){ //obtain yPos 
int chooseValue = positioner.nextInt(76); //randomly choose a number from 0-75 
yPos = chooseValue; //assign yPos to that value 
return yPos; //return yPos as that value 

} 


  

public Picture getPicture(){ //get picture 
return Picture; //return the picture 
} 


  

  

public void setNewPos(int newX, int newY){ //set new positions for values 
newX = xPos; //new xPos set 
newY = yPos; //new yPos set 
}}