Sample of Java Pattern -- Adapter

LegacyModel.java

package adapter;

public class LegacyModel {
    public void ins(String sku){
        System.out.println("call ins method.");
    }
}

ModernModel.java

package adapter;

public interface ModernModel {
    public void save(Order order);
}

ModernModelAdapter.java

package adapter;

public class ModernModelAdapter implements ModernModel{
    private LegacyModel legacyModel;
    
    public ModernModelAdapter(LegacyModel legacyModel) {
        super();
        this.legacyModel = legacyModel;
    }
    
    public void save(Order order){
        String sku = order.getSku();
        legacyModel = new LegacyModel();
        legacyModel.ins(sku);
    }
}

Order.java

package adapter;

public class Order {
    private String sku;

    public String getSku() {
        return sku;
    }

    public void setSku(String sku) {
        this.sku = sku;
    }
    
}

AdapterTest.java

package adapter;

public class AdapterTest {
    public static void main(String[] args) {
        LegacyModel legacy = new LegacyModel(); 
        Order order = new Order();
        order.setSku("sku");
        ModernModelAdapter adapter = new ModernModelAdapter(legacy);
        adapter.save(order);
    }
}

you may download the source code.