Variable.java

import java.util.Objects;

class Variable {
 String name;
 String type;
 Variable(String name, String type){
 this.name=name;
 this.type=type;
 }

 @Override
 public boolean equals(Object o) {
 if (this == o) return true;
 if (o == null || getClass() != o.getClass()) return false;
 Variable variable = (Variable) o;
 return Objects.equals(name, variable.name) &&
 Objects.equals(type, variable.type);
 }

 @Override
 public int hashCode() {
 return Objects.hash(name, type);
 }
}