Java/カプセル化

package sample;
import java.io.*;
public class SampleClass {
	public static void main(String[] args) throws IOException {
		Sample s = new Sample();
		s.setSample("おにぎり");
		System.out.println(s.buy());
	}
}

class Sample {
	private String drink = "コーヒー";
	private String food = "サンドイッチ";
	void setSample(String eat) {
		food = eat;
	}
	String buy() {
		return drink + "と" + food + "を買いました。";
	}
}