做这个东西主要是为了练习一下以前学习过的java Swing,所以那些复杂的算法就没有加载到里面去........
先展示一下效果....
，额，当然不是这个样子....
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代码：
package dialog_color; import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern; import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
/*简易计算器*/
public class Simple_jisuanqi {
public static void main(String args []) { Caculate mycacu = new Caculate();
// Container con =mycacu.getContentPane();
mycacu.setTitle("GXjun计算器"); }
}
class Caculate extends JFrame implements ActionListener
{
Container mycon; //设置重量级容器
JPanel jpanel_1,jpanel_2,jpanel_3; //设置轻量级布局
myJButton button []= new myJButton [20];
JTextField mytext;
JLabel label;
GridLayout grid = new GridLayout(4,4);
Caculate(){ //构造函数
mycon = getContentPane();
jpanel_1 = new JPanel(); /*默认的格式为FlowLayout*/
jpanel_2 =new JPanel();
jpanel_3 = new JPanel();
jpanel_2.setLayout(grid);
mytext = new JTextField(14);
mytext.setEditable(false); //设置成为不能
mytext.setFont(new Font("Arial",Font.BOLD,22));
/* for(int i=0;i<20;i++)
button[i]=new myJButton(null);*/
button[0] = new myJButton(" 后退 ",22);
button[0].addActionListener(this);
button[1] = new myJButton(" 归零 ",22);
button[1].addActionListener(this);
jpanel_1.add(button[0]);
jpanel_1.add(mytext);
jpanel_1.add(button[1]);
label = new JLabel(new ImageIcon("C:\\Users\\Administrator.USERSWO-MKA59UH\\Desktop\\java\\bin\\dialog_color\\a.jpg"));
// label = new JLabel(new ImageIcon("D:\\2\\2.gif"));
jpanel_3.add(label);
for(int i=2;i<12;i++)
button[i]=new myJButton(" "+i+" ",26);
char str[][]={{'7','8','9','/'},{'4','5','6','*'},{'1','2','3','-'},{'0','.','+','='}};
for(int i=0;i<4;i++)
for(int j=0;j<4;j++){
button[2+i*4+j] =new myJButton(" "+str[i][j]+" ",26);
button[2+i*4+j].addActionListener(this);
jpanel_2.add(button[2+i*4+j]);
}
mycon.add(jpanel_1,BorderLayout.CENTER);
mycon.add(jpanel_3,BorderLayout.NORTH);
mycon.add(jpanel_2,BorderLayout.SOUTH);
init();
}
void init() /*相关组件的一系列的初始化*/
{
setBounds(100, 100, 477, 280);
setVisible(true);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
String str ="";
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
//System.out.println(e.getActionCommand());
if(e.getSource()==button[0]||e.getSource()==button[1])
{
if(e.getSource()==button[0]){
System.out.println(str);
if(!str.isEmpty()){
str=str.substring(0, str.length()-1) ; //后退一格
}
}
else str="";
}
else
{
if(e.getSource()==button[17]){
//等于号的时候，又该如何处理？ 正则表达式
//System.out.println(e.getActionCommand());
/*System.out.println(sove_calc(str));*/
Double judge=sove_calc(str.trim());
if(judge==Double.MAX_VALUE)
{
mytext.setText("error!");
validate();
return;
}
else str=judge.toString();
}
else{
str+=e.getActionCommand().toString().trim();
}
}
if(str.isEmpty()) mytext.setText("0");
else mytext.setText(str);
validate();
}
private Double sove_calc(String str)
{
/*怎么提起出字符串里面的运算符号呢*/
Pattern mypa = Pattern.compile("\\+|\\-|\\*|\\/");
Matcher mtma = mypa.matcher(str);
List<String> listhoge = new ArrayList();
while(mtma.find()) listhoge.add(mtma.group());
String [] hoge = listhoge.toArray(new String [0]); //获取运算符号
/*突然遇到一个问题怎么从字符串提起浮点型数据呢？*/
Pattern mypart = Pattern.compile("\\.\\d|\\d+(\\.\\d+)?");
Matcher mtmatcher =mypart.matcher(str);
List<String> listval = new ArrayList();
while(mtmatcher.find())
listval.add(mtmatcher.group());
String [] val=listval.toArray(new String[0]);
double sum=Double.parseDouble(val[0]);
for( int i=0;i<hoge.length;i++)
{
System.out.println(hoge[i].charAt(0));
switch(hoge[i].charAt(0))
{
case '+': sum += Double.parseDouble(val[i+1]); break;
case '-': sum -= Double.parseDouble(val[i+1]); break;
case '*': sum *= Double.parseDouble(val[i+1]); break;
case '/':
{
Double tem=Double.parseDouble(val[i+1]);
if(tem.equals(0)) return Double.MAX_VALUE;
sum/=tem;
break;
}
default : System.out.println("error!"); break;
}
}
return sum;
}
}
class myJButton extends JButton
{
public myJButton(String name,int size)
{
// TODO Auto-generated constructor stub
super(name);
setFont(new Font("仿宋",Font.BOLD,size));
setMargin(new Insets(2,2,2,2));
setBorder(BorderFactory.createRaisedBevelBorder());
setBackground(Color.LIGHT_GRAY);
}
}