简单的计算器-Java-可视化

最新推荐文章于 2023-12-08 08:24:24 发布

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最新推荐文章于 2023-12-08 08:24:24 发布

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分类专栏： Java 文章标签： command string class button import input

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本文介绍了一个使用Java实现的简易计算器程序。该程序包含基本算术运算功能，如加、减、乘、除等，并通过图形界面进行操作。代码展示了如何创建按钮响应事件及执行计算逻辑。

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package Works_JavaLesson;

import java.awt.*;
import java.awt.event.*;

public class SimpleCalculator {

/**
* @param simple calculator
* @author CHENJIAN
*/
public static void main(String[] args) {
  SimpleCalculatorFrame frame = new SimpleCalculatorFrame();
  frame.setVisible(true);
  frame.addWindowListener(
   new WindowAdapter(){
    public void windowClosing(WindowEvent event){
     System.exit(0);
    }
   });
}

}

class SimpleCalculatorFrame extends Frame{
public SimpleCalculatorFrame(){
  setTitle("--- Simple Calculator ---");
  setLocation(300, 200);
  setLayout(new BorderLayout());

  SimpleCalculatorPanel panel = new SimpleCalculatorPanel();
  add(panel);
  pack();
}
}

class SimpleCalculatorPanel extends Panel{
public SimpleCalculatorPanel(){
  setLayout(new BorderLayout());
  panel_A = new Panel();
  panel_B = new Panel();
  lastCommand = "=";
  result = 0;

  textfield = new TextField(30);
  textfield.setBackground(Color.WHITE);
  panel_A.add(textfield, BorderLayout.NORTH);
  add(panel_A);

  panel_B.setLayout(new GridLayout(2, 3, 3, 3));
  ActionListener command = new CommandAction();

  makeButton("*", command);
  makeButton("-", command);
  makeButton("%", command);
  makeButton("+", command);
  makeButton("/", command);
  makeButton("=", command);
  add(panel_B, BorderLayout.SOUTH);
}
public void makeButton(String name, ActionListener listener){
  Button btn = new Button(name);
  btn.addActionListener(listener);
  panel_B.add(btn);
}
private class CommandAction implements ActionListener{
  public void actionPerformed(ActionEvent event){
   String input = event.getActionCommand();

   if(lastCommand.equals("=")){
    result = Double.parseDouble(textfield.getText());
   }
   else if(lastCommand.equals("*")){
    result *= Double.parseDouble(textfield.getText());
   }
   else if(lastCommand.equals("/")){
    result /= Double.parseDouble(textfield.getText());
   }
   else if(lastCommand.equals("+")){
    result += Double.parseDouble(textfield.getText());
   }
   else if(lastCommand.equals("-")){
    result -= Double.parseDouble(textfield.getText());
   }
   else if(lastCommand.equals("%")){
    result %= Double.parseDouble(textfield.getText());
   }
   lastCommand = input;
   textfield.setText(String.valueOf(result));
  }
}

private Panel panel_A;
private Panel panel_B;
private double result;
private String lastCommand;
private TextField textfield;
}

2009-05-28 09:51:22