java计算器小程序.doc

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1、Myeclipse环境下Java语言编写的计算器小程序 源代码 /程序的主要部分package pkg_1;import java.awt.*;import java.awt.Button;import java.awt.GridLayout;import java.awt.Panel;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowEvent;import java.awt.event.Win

2、dowListener;public class cacalator extends Frame implements ActionListener, WindowListener String button_name = 1, 2, 3, +, 4, 5, 6, -, 7, 8, 9, *, 0, =, 清除, / ;/按钮上的字符串Button but;/按钮数组TextField text_1;/一个文本框 用于记录数入的字符串Panel pan_1, pan_2;/两个面板double n_1 = 0, n_2 = 0;/记录输入的数值char c = 1;/记录输入的符号 stati

3、c int n=0;/记录数入的符号的数目static String s_1=,s_3=; static String s_2 =;/记录输入符号前输入的字符串 cacalator()super(计算器);/调用父类的构造函数setSize(300,300);/设置大小setLayout(new BorderLayout(10,10);/布局but=new Buttonbutton_name.length;/实例化 创建按钮数组text_1=new TextField(0);/实例化并出示话为0pan_1=new Panel();/实例化pan_2=new Panel();/实例化pan_1.

4、setLayout(new GridLayout(1,1);/设置面板1为2行1列pan_1.add(text_1);/将文本框添加到面板1中add(pan_1,BorderLayout.NORTH);/将面板1放到窗体的上部pan_2.setLayout(new GridLayout(4,4);/设置面板2为4行4列for(int i=0;ibutton_name.length;i+)buti=new Button(button_namei);/写入按钮上的字pan_2.add(buti);/按钮添加到面板2上buti.addActionListener(this);/加上监听add(pan

5、_2,BorderLayout.CENTER);/将面板2放到窗体的中间addWindowListener(this);/窗体加上监听setVisible(true);/设置可见public void actionPerformed(ActionEvent arg0) String s_0, s_1;/定义字符创用以存储读出的东西s_0 = arg0.getActionCommand();/读到单击按钮时 按钮上的字符串 相当于记录命令s_1 = text_1.getText();/读出文本框1的内容if(s_0.equals(1) | s_0.equals(2) | s_0.equals(3

6、) |s_0.equals(4) |s_0.equals(5) |s_0.equals(6) |s_0.equals(7) |s_0.equals(8) |s_0.equals(9) |s_0.equals(0)if(n%2=0)s_2=s_2+s_0;text_1.setText(s_2);/如果这个时候没有输入 运算符 则直接将单击的东西连接在s_2上 并显示在s_2上n_1=(Float.valueOf(s_2).floatValue();/在没有输入运算符的时候将数值记录在n_1上if(n%2=1)s_3=s_3+s_0;text_1.setText(s_3);/如果这个时候输入了运算

7、符 则直接将单击的东西连接在s_2上 并显示在s_2上n_2=(Float.valueOf(s_3).floatValue();/在输入了运算符的时候将数值记录在n_2上if(s_0.equals(+)n=n+1;c=+;/text_1.setText(); if(s_0.equals(-)n=n+1;c=-;/text_1.setText();if(s_0.equals(*)n=n+1;c=*;/text_1.setText();if(s_0.equals(/)n=n+1;c=/;/text_1.setText();if(s_0.equals(=)n=n+1;s_3=;if(c=+)n_1=

8、n_1+n_2;s_1=Double.toString(n_1);if(c=-)n_1=n_1-n_2;s_1=Double.toString(n_1);if(c=*)n_1=n_1*n_2;s_1=Double.toString(n_1);if(c=/)n_1=n_1/n_2;s_1=Double.toString(n_1);text_1.setText(s_1); if(s_0.equals(清除)c=1;n_1=0;n_2=0;s_1=;s_2=;text_1.setText();public void windowActivated(WindowEvent arg0) / TODO A

9、uto-generated method stubpublic void windowClosed(WindowEvent arg0) public void windowClosing(WindowEvent arg0) Window w=(Window)arg0.getSource();setVisible(false);w.dispose();public void windowDeactivated(WindowEvent arg0) / TODO Auto-generated method stubpublic void windowDeiconified(WindowEvent a

10、rg0) / TODO Auto-generated method stubpublic void windowIconified(WindowEvent arg0) / TODO Auto-generated method stubpublic void windowOpened(WindowEvent arg0) / TODO Auto-generated method stub/这是主函数部分package pkg_1;import javax.swing.JOptionPane;public class cacalator_1 public static void main(String args) cacalator cac_1=new cacalator();