科学计算器程序Java代码

1、科学计算器程序 java 代码mc：清除独立内存里的数字mr：读出独立内存数字ms：将显示数字保存到独立内存 ,并取代内存中原有数字m+：将显示数字向独立内存累加(独立内存是一个临时寄放数字的存储器 ,方便计算 )ce：纠错键(clear error). 输入数字有错 ,按它可以重新输入 c：表示清零,将计算器恢复到开机状态功能举例：源程序如下：import java.awt.borderlayout;import java.awt.color;import java.awt.dimension;import java.awt.font;import java.awt.gridlayout;i

2、mport java.awt.event.actionevent;import java.awt.event.actionlistener;import java.text.decimalformat;import javax.swing.borderfactory;import javax.swing.buttongroup;import javax.swing.jbutton;import javax.swing.jcheckboxmenuitem;import javax.swing.jframe;import javax.swing.jmenu;import javax.swing.j

3、menubar;import javax.swing.jmenuitem;import javax.swing.jpanel;import javax.swing.jradiobuttonmenuitem;import javax.swing.jtextfield;public class calucator extends jframe private jtextfield tf;private jpanel panel1 , panel2 , panel3, panel4 ;private jmenubar mybar ;private jmenu menu1 , menu2, menu3

4、 ;private jmenuitem edititem1 , edititem2 , help1, help2, help3;private jradiobuttonmenuitem seeitem1 , seeitem2 ;/单选框private jcheckboxmenuitem seeitem3 ;/ 复 选框private buttongroup bgb;private string back;private boolean ifresult = true, flag =false;private string oper = =;private double result = 0;p

5、rivate num numactionlistener ;private decimalformat df;public calucator()super (科学计算器);/设置标题栏df = new decimalformat( #.#);/保 留四位小数this.setlayout( newborderlayout(10,5);panel1 = new jpanel( new gridlayout(1, 3, 10, 10);panel2 = new jpanel( new gridlayout(5, 6, 5, 5); /5行6列panel3 = new jpanel( new gri

6、dlayout(5, 1, 5, 5);panel4 = new jpanel( new borderlayout(5, 5);/* 菜单栏*/mybar = new jmenubar();menu1 = new jmenu( 编辑(e);menu2 = new jmenu( 查看(v);menu3 = new jmenu( 帮助(h);menu1 .setfont( newfont.plain, 12);menu2 .setfont( newfont.plain, 12);menu3 .setfont( newfont( 宋 体 ,font( 宋 体 ,font( 宋 体 ,font.pla

7、in, 12);/* 编辑栏*/edititem1 = new jmenuitem( 复 制 (c) ctrl+c );edititem2 = new jmenuitem( 粘 贴 (p) ctrl+v );edititem1 .setfont( new,font. plain,12);edititem2 .setfont( new,font. plain,12);font( 宋 体font( 宋 体/* 查看栏*/seeitem1 = new jradiobuttonmenuitem( 科学型(t);seeitem2 = new jradiobuttonmenuitem( 标准型(s);se

8、eitem3 = new jcheckboxmenuitem( 数字 分组(i);seeitem1 .setfont( newfont(宋体,font. plain,12);seeitem2 .setfont( newfont(宋体,font. plain,12);seeitem3 .setfont( newfont(宋体,font. plain,12);/* 帮助栏*/help1 = new jmenuitem( 帮助主题(h);help2 = new jmenuitem( 关 于 计 算 器 (a);help1 .setfont( newfont(宋体,font. plain,12);he

9、lp2 .setfont( newfont(宋体,font. plain,12);bgb = new buttongroup(); /选项组menu1 .add(edititem1);menu1 .add(edititem2);menu2 .add(seeitem1);menu2 .add(seeitem2);menu2 .addseparator(); /添加一条分割线 menu2 .add(seeitem3);menu3 .add(help1 );menu3 .addseparator(); /添加一条分割线 menu3 .add(help2 );mybar .add(menu1 );my

10、bar .add(menu2 );mybar .add(menu3 );this.setjmenubar( mybar );numactionlistener = new num();/实现数 字监听/* 文本域，即为计算器的屏幕显示区域 */tf = new jtextfield();tf.seteditable( false);/ 文本区域不可 编辑tf.setbackground(color. white);/ 文 本 区域的背景色tf.sethorizontalalignment(jtextfield. ri ght);/文字右对齐tf.settext(0);tf.setborder(

11、borderfactory. createloweredbevelborder();init(); /对计算器进行初始化/* 初始化操作* 添加按钮*/private void init()addbutton( panel1,clear(), color. red);backspace ,newaddbutton( panel1, ce, new clear(), color. red);addbutton( panel1, c, new clear(), color. red);addbutton( panel2, 1/x, new signs(), color. magenta);addb

12、utton( panel2, log, new signs(), color. magenta);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);7,8,9,addbutton( panel2, , new signs(), color. red);addbutton( panel2, n!, new signs(), color.

13、magenta);addbutton( panel2, sqrt, new signs(), color. magenta);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);4,5,6,addbutton( panel2, , new signs(), color. red);addbutton( panel2, sin, new s

14、igns(), color. magenta);addbutton( panel2, x2, new signs(),color. magenta);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);addbutton( panel2, numactionlistener , color. blue);1,2,3,addbutton( panel2, -, new signs(), color. red);addbutton( panel

15、2, cos, new signs(), color. magenta);addbutton( panel2, x3, new signs(), color. magenta);addbutton( panel2, numactionlistener , color. blue);0,addbutton( panel2, -/+, new clear(), color. blue);addbutton( panel2,.,newdot(),color. blue);addbutton( panel2, +, new signs(), color. red);addbutton( panel2,

16、 tan, new signs(), color. magenta);addbutton( panel2, %, new signs(), color. magenta);addbutton( panel2,numactionlistener , color. orange);addbutton( panel2, numactionlistener , color. orange);e,addbutton( panel2, , new signs(), color. orange);addbutton( panel2, =, new signs(), color. red);jbutton b

17、tns = new jbutton( 计算器);btns.setborder(borderfactory. createloweredbevelborder();btns.setenabled( false );/按钮不可操作btns.setpreferredsize( newdimension(20, 20);panel3 .add(btns);/加入按钮addbutton( panel3,color. red);addbutton( panel3,color. red);addbutton( panel3,color. red);addbutton( panel3,color. red);

18、mc,mr,ms,m+,null,null,null,null,panel4 .add( panel1 ,borderlayout. north);panel4 .add( panel2 ,borderlayout. center);this.add( tf, borderlayout. north); this.add( panel3, borderlayout. west); this.add( panel4);pack();this.setresizable( false);/ 窗口不可改 变大小this.setlocation(300, 200);this.setdefaultclos

19、eoperation(jframe. exit_on_close);/* 统一设置按钮的的使用方式* param panel* param name* param action* param color*/private voidaddbutton(jpanel panel,string name, actionlistener action, color color)jbutton bt = new jbutton(name);panel.add(bt); /在面板上增加按钮bt.setforeground(color); /设置前景（字 体）颜色bt.addactionlistener(a

20、ction); / 增加监 听事件/* 计算器的基础操作（ + - ）* param x*/private void getresult ( double x) if(oper = +)result += x;else if(oper = -)result -= x;else if(oper = )result *= x;else if(oper = )result /= x;else if(oper = =)result = x; tf.settext( df.format( result );/* 运算符号的事件监听*/class signs implements actionlisten

21、erpublicactionperformed(actionevent e) /*void*用 actionevent对象的getactioncommand() 方法* 取得与引发事件对象相关的字符串 */string str = e.getactioncommand();/* sqrt 求平方根 */if(str.equals(sqrt)doubledouble. parsedoubleif(i=0)/*i =(tf.gettext();* string.valueof() 转换为字符串* df.format() 按要求保留四位小数* math.sqrt() 求算数平方根 */tf.sett

22、ext(string. valueof(df.format(mat h.sqrt(i);elsetf.settext( 负 数 不 能 开 平 方 根);/* log 求常用对数 */else if(str.equals( log )doublei =double. parsedouble(tf.gettext();if(i0)tf.settext(string. valueof(df.format(mat h.log(i);else tf.settext( 负数不能求对数 ); /* %求百分比 */else if(str.equals( %)tf.settext( df.format(do

23、uble. parsedouble (tf.gettext() / 100);/* 1/x 求倒数 */else if(str.equals( 1/x )if(double. parsedouble(tf.gettext() = 0)tf.settext( 除数不能为零);else tf.settext( df.format(1double. parsedouble(tf.gettext();/* sin 求正弦函数 */else if(str.equals( sin )doublei =double. parsedouble(tf.gettext();tf.settext(string. v

24、alueof(df.format(mat h.sin(i);/* cos 求余弦函数 */else if(str.equals( cos )doublei =double. parsedouble(tf.gettext();tf.settext(string. valueof(df.format(mat h.cos(i);/* tan 求正切函数 */else if(str.equals( tan )doublei =double. parsedouble(tf.gettext();tf.settext(string. valueof(df.format(mat h.tan(i);/* n! 求阶乘 */else if(str.equals( n!)doublei =double. parsedouble(tf.gettext();if(i%2=0)|(i%2=1) / 判断为整 数放进行阶乘操作int j = ( int)i;/强制类型转换 int result=1;for(int k=1;kif(tf.gettext().length() 1)tf.settext( tf.gettext().substring(0,tf.gettext().length() - 1);/使用退格删除最后一位字符 elsetf.settext( 0);i