Java 81. Áp dụng mô hình MVC trong xây dựng chương trình và cách xử lý sự kiện

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Video giải thích chi tiết

 Code chi tiết 

     package model;

public class CounterModel {
	private int value;
	
	public CounterModel() {
		this.value=0;
	}

	/**
	 * @return the value
	 */
	public int getValue() {
		return value;
	}

	/**
	 * @param value the value to set
	 */
	public void setValue(int value) {
		this.value = value;
	}
	
	public void increment() {
		this.value++;
	}
	
	public void decrement() {
		this.value--;
	}
	
	public void reset() {
		this.value=0;
	}
}

     

     package view;

import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.nio.ByteOrder;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

import controller.CounterListener;
import model.CounterModel;

public class CounterView extends JFrame{
	private CounterModel counterModel;
	private JButton jButton_up;
	private JButton jButton_down;
	private JLabel  jLabel_value;
	
	public CounterView() {
		this.counterModel = new CounterModel();
		this.init();
		this.setVisible(true);
	}
	
	public void init() {
		this.setTitle("Counter");
		this.setSize(300, 300);
		this.setLocationRelativeTo(null);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		ActionListener ac = new CounterListener(this);
		
		jButton_up = new JButton("UP");
		jButton_up.addActionListener(ac);
		
		jButton_down = new JButton("DOWN");
		jButton_down.addActionListener(ac);
		
		jLabel_value = new JLabel(this.counterModel.getValue()+"", JLabel.CENTER);
		
		JPanel jPanel = new JPanel();
		jPanel.setLayout(new BorderLayout());
		jPanel.add(jButton_up, BorderLayout.WEST);
		jPanel.add(jLabel_value, BorderLayout.CENTER);
		jPanel.add(jButton_down, BorderLayout.EAST);
		
		this.setLayout(new BorderLayout());
		this.add(jPanel, BorderLayout.CENTER);
	}
	
	public void increment() {
		this.counterModel.increment();
		this.jLabel_value.setText(this.counterModel.getValue()+"");
	}
	public void decrement() {
		this.counterModel.decrement();
		this.jLabel_value.setText(this.counterModel.getValue()+"");
	}
}

     

     package controller;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import view.CounterView;

public class CounterListener implements ActionListener{
	private CounterView ctv;
	
	public CounterListener(CounterView ctv) {
		this.ctv = ctv;
	}
	@Override
	public void actionPerformed(ActionEvent e) {
//		System.out.println("Ban da nhan nut!");
		
		String src = e.getActionCommand();
		System.out.println("Ban da nhan nut: "+ src);
		
		if(src.equals("UP")) {
			this.ctv.increment();
		}else if(src.equals("DOWN")) {
			this.ctv.decrement();
		}
	}

}

     

     package test;

import model.CounterModel;
import view.CounterView;

public class Test {
	public static void main(String[] args) {
		CounterModel ct = new CounterModel();
		ct.increment();
		ct.increment();
		ct.increment();
		System.out.println(ct.getValue());
		ct.decrement();
		System.out.println(ct.getValue());
		
		CounterView ctv = new CounterView();
	}
}