TaiwanConsensus

People.java

public abstract class People {
    abstract public String getNationality();
    abstract public String getAdjective();

    public interface Thinkable {
        String getOppose();
        String getConsensus();
    }

    public String getDeclaration() {
        StringBuilder builder = new StringBuilder();
        if (!(this instanceof Thinkable))
            return builder.append("I'm a person from ").append(getNationality()).append(". ^^").toString();

        return builder.append("The ").append(getAdjective())
                .append(" will never accept ").append(((Thinkable) this).getOppose()).append(". Instead, ")
                .append("\"").append(((Thinkable) this).getConsensus()).append("\" ")
                .append("is the consensus of the vast majority of ").append(getAdjective()).append(".")
                .toString();
    }
}

TaiwanConsensusActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class TaiwanConsensusActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView tv = findViewById(R.id.text_view);
        tv.setText(new ThinkableTaiwanese().getDeclaration());
    }
}

Taiwanese.java

public class Taiwanese extends People {
    @Override
    public String getNationality() {
        return "Taiwan";
    }

    @Override
    public String getAdjective() {
        return "Taiwanese";
    }
}

ThinkableTaiwanese.java

public class ThinkableTaiwanese extends Taiwanese implements People.Thinkable {
    @Override
    public String getOppose() {
        return "one country, two systems";
    }

    @Override
    public String getConsensus() {
        return "Taiwan is a sovereign-independent country";
    }
}