concretedatamanager.java

应付作业+练习OOP做的东西

package model;

import java.util.ArrayList;

public class ConcreteDataManager extends DataManager {
	private ConcreteDataManager() {// SINGLETON
		super();
		this.datastorage = new ArrayList<Double>();

	}

	@Override
	public void addData(double data) {
		datastorage.add(data);
		renewData();
	}

	@Override
	public void deleteData(double data) {
		datastorage.remove(data);
		renewData();
	}

	@Override
	public double[] getAllData() {
		double[] result;

		Object[] temp = datastorage.toArray();
		result = new double[temp.length];
		for (int i = 0; i < result.length; i++) {
			result[i] = ((Double) temp[i]).doubleValue();
		}

		return result;
	}

	public static DataManager getInstance() {
		if (instance == null)
			instance = new ConcreteDataManager();
		return instance;
	}

	private void renewData() {
		displayer.renewData(this.getAllData());
	}

	private static ConcreteDataManager instance;

	private ArrayList<Double> datastorage;

	@Override
	public void deleteAll() {
		datastorage = new ArrayList<Double>();
		renewData();
	}

}