我如何翻译模式：计算器javacode [英] How I do Interpreter Pattern: Calculator javacode

问题描述

从java代码我如何在解释器模式中实现它.......

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包裹测试;



import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.GridLayout;

import java。 awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java .awt.event.WindowEvent;



import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;



公共类计算器扩展JPanel实现ActionListener {

private JTextField display = new JTextField（0）;



private String buttonText =789/456 * 123-0。= + ;



pri vate double result = 0;



private String operator ==;



private boolean calculation = true;



公共计算器（）{

setLayout（new BorderLayout（））;



display.setEditable（false）;

add（显示，North）;



JPanel p = new JPanel （）;

p.setLayout（new GridLayout（4,4））;



for（int i = 0;我< buttonText.length（）; i ++）{

JButton b = new JButton（buttonText.substring（i，i + 1））;

p.add（b）;

b.addActionListener（this）;



}

add（p，Center）;

}



public void actionPerformed（ActionEvent evt）{

String cmd = evt.getActionCommand（）;

if（'0'< = cmd.charAt（0）&& cmd.charAt（0）< ='9'|| cmd.equals（。））{

如果（计算）

display.setText（cmd）;

else

display.setText（display.getText（）+ cmd）;

计算=假;

}否则{

if（计算）{

if（cmd.equals（ - ））{

display.setText（cmd）;

计算=假;

}否则

operator = cmd;

} else {

double x = Double.parseDouble（display.getText（）） ;

计算（x）;

operator = cmd;

计算=真;

}

}

}



private void calculate（double n）{

if（运算符） .equals（+））

结果+ = n;

否则if（operator.equals（ - ））

结果 - = n;

else if（operator.equals（*））

result * = n;

else if（operator。等于（/））

结果/ = n;

否则if（operator.equals（=））

result = n;

display.setText（+ result）;

}



public static void main（ String [] args）{

JFrame frame = new JFrame（）;

frame.setTitle（Calculator）;

frame.setSize （200,200）;

frame.addWindowListener（new WindowAdapter（）{

public void windowClosing（WindowEvent e）{

System.exit （0）;

}

}）;



容器contentPane = frame.getContentPane（）;

contentPane.add（新计算器（））;

frame.show（）;

}

}

解决方案

翻译模式 [ ^ ]



玩得开心！

From java code how i can make it in Interpreter Pattern .......
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package test;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

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

public class Calculator extends JPanel implements ActionListener {
private JTextField display = new JTextField("0");

private String buttonText = "789/456*123-0.=+";

private double result = 0;

private String operator = "=";

private boolean calculating = true;

public Calculator() {
setLayout(new BorderLayout());

display.setEditable(false);
add(display, "North");

JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));

for (int i = 0; i < buttonText.length(); i++) {
JButton b = new JButton(buttonText.substring(i, i + 1));
p.add(b);
b.addActionListener(this);

}
add(p, "Center");
}

public void actionPerformed(ActionEvent evt) {
String cmd = evt.getActionCommand();
if ('0' <= cmd.charAt(0) && cmd.charAt(0) <= '9' || cmd.equals(".")) {
if (calculating)
display.setText(cmd);
else
display.setText(display.getText() + cmd);
calculating = false;
} else {
if (calculating) {
if (cmd.equals("-")) {
display.setText(cmd);
calculating = false;
} else
operator = cmd;
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = cmd;
calculating = true;
}
}
}

private void calculate(double n) {
if (operator.equals("+"))
result += n;
else if (operator.equals("-"))
result -= n;
else if (operator.equals("*"))
result *= n;
else if (operator.equals("/"))
result /= n;
else if (operator.equals("="))
result = n;
display.setText("" + result);
}

public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("Calculator");
frame.setSize(200, 200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

Container contentPane = frame.getContentPane();
contentPane.add(new Calculator());
frame.show();
}
}

解决方案

Interpreter pattern[^]

Have fun!

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