Instrument.java

public class Instrument implements Clonable {
 String m_class;
 String type;
 String firm;
 String name;
 public void print() {
 System.out.println("["+this.m_class+"] " + this.type + ' ' + this.firm + ' ' + this.name);
 }

 public Instrument(String m_class, String type, String firm, String name) {
 this.m_class = m_class;
 this.type = type;
 this.firm = firm;
 this.name = name;
 }

 public Instrument(Instrument i){
 this.m_class = i.m_class;
 this.type = i.type;
 this.firm = i.firm;
 this.name = i.name;
 }

 // Паттерн прототип https://refactoring.guru/ru/design-patterns/prototype
 @Override
 public Instrument clone() {
 return new Instrument(this);
 }
}