[medium snippets] #medium #designPattern #ProxyPattern

ProxyImage.java

public class ProxyImage implements Image{
  private RealImage realImage;
  private String fileName;
  
  public ProxyImage(String fileName){
    this.fileName = fileName;
  }
  
  @Override
  public void display() {
    if(realImage == null){
      realImage = new RealImage(fileName);
    }
    realImage.display();
  }
}