mycalculator.java

带括号计算器的Java源代码在NetBeans中的实现

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package  Calculator;

/**
 *
 * @author wxyc
 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class MyCalculator {


    public static void main(String[] args) {
        JFrame frame=new JFrame("calculator");
        Container calculator=frame.getContentPane();
        JPanel panel1,panel2,panel3;
        panel1=new JPanel();
        panel2=new JPanel();
        panel3=new JPanel();
        panel1.setLayout(new GridLayout(1,1));
        panel2.setLayout(new GridLayout(4,4));
        panel3.setLayout(new GridLayout(1,3));
        final JTextField result;
        result=new JTextField("",100);
        JButton button[]=new JButton[19];
        int i;
        panel1.add(result);
         ActionListener number=new ActionListener(){
            public void actionPerformed(ActionEvent e){
                result.setText(result.getText()+e.getActionCommand());
            }
        };
        for(i=0;i<=9;i++){
            button[i]=new JButton(String.valueOf(i));
            panel2.add(button[i]);
            button[i].addActionListener(number);
           }
        button[10]=new JButton("+");
        button[11]=new JButton("-");
        button[12]=new JButton("*");
        button[13]=new JButton("/");
        button[14]=new JButton("(");
        button[15]=new JButton(")");
        button[16]=new JButton(".");
        button[17]=new JButton("Reset");
        button[18]=new JButton("=");
        for(i=10;i<=15;i++){
          panel2.add(button[i]);
          button[i].addActionListener(number);
        }
        panel3.add(button[16]);
        button[16].addActionListener(number);
        ActionListener reset=new ActionListener(){
            public void actionPerformed(ActionEvent e){
                result.setText("");
            }
        };
        panel3.add(button[17]);
        button[17].addActionListener(reset);

        ActionListener toresult=new ActionListener(){
            public void actionPerformed(ActionEvent e){
                String s;
                s=result.getText();
                function ans=new function(s);
                result.setText(result.getText()+"="+ans.calculate());

            }
        };
        panel3.add(button[18]);
        button[18].addActionListener(toresult);
        calculator.setLayout(null);
        calculator.add(panel1);
        panel1.setBounds(15,10,260,20);
        calculator.add(panel2);
        panel2.setBounds(15,40,260,110);
        calculator.add(panel3);
        panel3.setBounds(15,160,260,30);
        frame.addWindowListener(new java.awt.event.WindowAdapter(){
       public void windowClosing(WindowEvent e){
       System.exit(0);
       }
       });
       result.setEditable(false);
       frame.setSize(300,250);
       frame.setVisible(true);
    }
}