Java 84. Cách sử dụng JTextField để hiển thị và nhập dữ liệu văn bản

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    Video giải thích chi tiết


     Code chi tiết 

    
package model;

public class MiniCalculatorModel {
	private double firstValue;
	private double secondValue;
	private double answer;
	
	public MiniCalculatorModel() {
	}

	public double getFirstValue() {
		return firstValue;
	}

	public void setFirstValue(double firstValue) {
		this.firstValue = firstValue;
	}

	public double getSecondValue() {
		return secondValue;
	}

	public void setSecondValue(double secondValue) {
		this.secondValue = secondValue;
	}

	public double getAnswer() {
		return answer;
	}

	public void setAnswer(double answer) {
		this.answer = answer;
	}
	
	public void plus() {
		this.answer =  this.firstValue + this.secondValue;
	}
	public void minus() {
		this.answer =  this.firstValue - this.secondValue;
	}
	public void multiply() {
		this.answer =  this.firstValue * this.secondValue;
	}
	public void divide() {
		this.answer =  this.firstValue / this.secondValue;
	}
	public void pow() {
		this.answer =  Math.pow(this.firstValue, this.secondValue);
	}
	public void mod() {
		this.answer =  this.firstValue % this.secondValue;
	}
}


    
package view;

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.HeadlessException;

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

import controller.MiniCalculatorListener;
import model.MiniCalculatorModel;

public class MiniCalculatorView extends JFrame {
	private MiniCalculatorModel miniCalculatorModel;
	private JTextField jTextField_firstValue;
	private JTextField jTextField_secondValue;
	private JTextField jTextField_answer;

	public MiniCalculatorView() throws HeadlessException {
		this.miniCalculatorModel = new MiniCalculatorModel();
		this.init();
	}

	private void init() {
		this.setTitle("Mini Calculator");
		this.setSize(600,300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setLocationRelativeTo(null);
		
		Font font = new Font("Arial", Font.BOLD, 40);
		
		JLabel jLabel_firstValue = new JLabel("1st Value");
		jLabel_firstValue.setFont(font);		
		JLabel jLabel_secondValue = new JLabel("2nd Value");
		jLabel_secondValue.setFont(font);
		JLabel jLabel_answer = new JLabel("Answer");
		jLabel_answer.setFont(font);
		
		jTextField_firstValue = new JTextField(50);
		jTextField_firstValue.setFont(font);
		jTextField_secondValue = new JTextField(50);
		jTextField_secondValue.setFont(font);
		jTextField_answer = new JTextField(50);
		jTextField_answer.setFont(font);
		
		JPanel jPanelIO = new JPanel();
		jPanelIO.setLayout(new GridLayout(3, 2, 10, 10));
		jPanelIO.add(jLabel_firstValue);
		jPanelIO.add(jTextField_firstValue);
		jPanelIO.add(jLabel_secondValue);
		jPanelIO.add(jTextField_secondValue);
		jPanelIO.add(jLabel_answer);
		jPanelIO.add(jTextField_answer);
		
		
		MiniCalculatorListener miniCalculatorListener = new MiniCalculatorListener(this);
		JButton jButton_plus = new JButton("+");
		jButton_plus.setFont(font);
		jButton_plus.addActionListener(miniCalculatorListener);
		JButton jButton_minus = new JButton("-");
		jButton_minus.setFont(font);
		jButton_minus.addActionListener(miniCalculatorListener);
		JButton jButton_multiply = new JButton("*");
		jButton_multiply.setFont(font);
		jButton_multiply.addActionListener(miniCalculatorListener);
		JButton jButton_divide = new JButton("/");
		jButton_divide.setFont(font);
		jButton_divide.addActionListener(miniCalculatorListener);
		JButton jButton_pow = new JButton("^");
		jButton_pow.setFont(font);
		jButton_pow.addActionListener(miniCalculatorListener);
		JButton jButton_mod = new JButton("%");
		jButton_mod.setFont(font);
		jButton_mod.addActionListener(miniCalculatorListener);
		
		JPanel jPanelButtons = new JPanel();
		jPanelButtons.setLayout(new GridLayout(2, 3));
		jPanelButtons.add(jButton_plus);
		jPanelButtons.add(jButton_minus);
		jPanelButtons.add(jButton_multiply);
		jPanelButtons.add(jButton_divide);
		jPanelButtons.add(jButton_pow);
		jPanelButtons.add(jButton_mod);
		
		this.setLayout(new BorderLayout(10, 10));
		this.add(jPanelIO, BorderLayout.CENTER);
		this.add(jPanelButtons, BorderLayout.SOUTH);
		this.setVisible(true);
	}
	public void plus() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.plus();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
	public void minus() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.minus();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
	public void multiply() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.multiply();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
	public void divide() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.divide();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
	public void pow() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.pow();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
	public void mod() {
		double firstValue = Double.valueOf(jTextField_firstValue.getText());
		double secondValue = Double.valueOf(jTextField_secondValue.getText());
		this.miniCalculatorModel.setFirstValue(firstValue);
		this.miniCalculatorModel.setSecondValue(secondValue);
		this.miniCalculatorModel.mod();
		this.jTextField_answer.setText(this.miniCalculatorModel.getAnswer()+"");
	}
}


    
package controller;

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

import view.MiniCalculatorView;

public class MiniCalculatorListener implements ActionListener{
	private MiniCalculatorView miniCalculatorView;
	
	public MiniCalculatorListener(MiniCalculatorView miniCalculatorView) {
		this.miniCalculatorView = miniCalculatorView;
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		String button = e.getActionCommand();
		if(button.equals("+")){
			this.miniCalculatorView.plus();
		}else if(button.equals("-")){
			this.miniCalculatorView.minus();
		}else if(button.equals("*")){
			this.miniCalculatorView.multiply();
		}else if(button.equals("/")){
			this.miniCalculatorView.divide();
		}else if(button.equals("^")){
			this.miniCalculatorView.pow();
		}else if(button.equals("%")){
			this.miniCalculatorView.mod();
		}
	}

}


    
111package test;

import view.MiniCalculatorView;

public class Test {
	public static void main(String[] args) {
		new MiniCalculatorView();
	}
}

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