java计算器代码.doc

packagecom.cctv;

importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.GridLayout;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;

importjavax.swing.*;
//事件监听机制Listener----monitor监听器，侦听器。班长----内部类
//XXXListener-----addXXXListener
publicclassTestextendsJFrame{
String[]str4={"编辑","查看","帮助"};
String[]str1={"复制","粘贴"};
String[]str2={"标准","科学","数字分组"};
String[]str3={"帮助主题","关于计算器"};
JMenuBarjmb;
JMenujm;
JMenuItemjmi;
JFramejf=newJFrame("我的计算器");
JTextFieldjtf;
privateString[]left={"MC","MR","MS","M+"};
privateString[]top={"Backspace","CE","C"};
privateString[]bottom={
"7","8","9","/","sqrt",
"4","5","6","*","%",
"1","2","3","-","1/x",
"0","+/-",".","+","="
};

privateJPanelp1;//面板1左。面板的默认布局管理器是流式布局。
privateJPanelp2;//面板2上
privateJPanelp3;//面板3主
privateJPanelp4;//面板4
privateJPanelp5;//面板5
privateJButtonjb;
privatedoubled1=0.0;//记录上一步的运算结果值。
privatedoubled2=0.0;//记录当前文本框的内容的double值。
privatebooleanisOperator=false;//记录上次按的是否是运算符键
privatecharoper='=';//记录上次运算符
privatecharch;

publicvoidcreatMenu(){
//生成一个菜单栏，然后往其中加入菜单，
//然后往各菜单中加入相应的菜单选项。
jmb=newJMenuBar();
for(inti=0;i<str4.length;i++){
jm=newJMenu(str4[i]);
if(i==0){
for(intj=0;j<str1.length;j++){
jmi=newJMenuItem(str1[j]);
jm.add(jmi);
}
jmb.add(jm);
}

if(i==1){
for(intj=0;j<str2.length;j++){
jmi=newJMenuItem(str2[j]);
jm.add(jmi);
}
jmb.add(jm);
}

if(i==2){
for(intj=0;j<str3.length;j++){
jmi=newJMenuItem(str3[j]);
jm.add(jmi);
}
jmb.add(jm);
}
}
}

publicvoidcreatFace(){
jf.setLayout(newBorderLayout(15,15));//设置面板的间距
jtf=newJTextField("0");//设置文本框
jtf.setHorizontalAlignment(JTextField.RIGHT);
jtf.setEditable(false);
jf.add(jtf,BorderLayout.NORTH);
//做按钮组
p1=newJPanel(newGridLayout(4,1,5,5));//设置大小间距
for(inti=0;i<left.length;i++){
jb=newJButton(left[i]);
jb.addActionListener(newMonitor());//注册监听
jb.setForegr