科學計算器程序Java代碼

1、科學計算器程序 java 代碼mc：清除獨立內存里的數(shù)字mr：讀出獨立內存數(shù)字ms：將顯示數(shù)字保存到獨立內存 ,并取代內存中原有數(shù)字m+：將顯示數(shù)字向獨立內存累加(獨立內存是一個臨時寄放數(shù)字的存儲器 ,方便計算 )ce：糾錯鍵(clear error). 輸入數(shù)字有錯 ,按它可以重新輸入 c：表示清零,將計算器恢復到開機狀態(tài)功能舉例：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 ;/單選框private jcheckboxmenuitem seeitem3 ;/ 復 選框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 (科學計算器);/設置標題欄df = new decimalformat( #.#);/保 留四位小數(shù)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);/* 菜單欄*/mybar = new jmenubar();menu1 = new jmenu( 編輯(e);menu2 = new jmenu( 查看(v);menu3 = new jmenu( 幫助(h);menu1 .setfont( newfont.plain, 12);menu2 .setfont( newfont.plain, 12);menu3 .setfont( newfont( 宋 體 ,font( 宋 體 ,font( 宋 體 ,font.pla

7、in, 12);/* 編輯欄*/edititem1 = new jmenuitem( 復 制 (c) ctrl+c );edititem2 = new jmenuitem( 粘 貼 (p) ctrl+v );edititem1 .setfont( new,font. plain,12);edititem2 .setfont( new,font. plain,12);font( 宋 體font( 宋 體/* 查看欄*/seeitem1 = new jradiobuttonmenuitem( 科學型(t);seeitem2 = new jradiobuttonmenuitem( 標準型(s);se

8、eitem3 = new jcheckboxmenuitem( 數(shù)字 分組(i);seeitem1 .setfont( newfont(宋體,font. plain,12);seeitem2 .setfont( newfont(宋體,font. plain,12);seeitem3 .setfont( newfont(宋體,font. plain,12);/* 幫助欄*/help1 = new jmenuitem( 幫助主題(h);help2 = new jmenuitem( 關 于 計 算 器 (a);help1 .setfont( newfont(宋體,font. plain,12);he

9、lp2 .setfont( newfont(宋體,font. plain,12);bgb = new buttongroup(); /選項組menu1 .add(edititem1);menu1 .add(edititem2);menu2 .add(seeitem1);menu2 .add(seeitem2);menu2 .addseparator(); /添加一條分割線 menu2 .add(seeitem3);menu3 .add(help1 );menu3 .addseparator(); /添加一條分割線 menu3 .add(help2 );mybar .add(menu1 );my

10、bar .add(menu2 );mybar .add(menu3 );this.setjmenubar( mybar );numactionlistener = new num();/實現(xiàn)數(shù) 字監(jiān)聽/* 文本域，即為計算器的屏幕顯示區(qū)域 */tf = new jtextfield();tf.seteditable( false);/ 文本區(qū)域不可 編輯tf.setbackground(color. white);/ 文 本 區(qū)域的背景色tf.sethorizontalalignment(jtextfield. ri ght);/文字右對齊tf.settext(0);tf.setborder(

11、borderfactory. createloweredbevelborder();init(); /對計算器進行初始化/* 初始化操作* 添加按鈕*/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( 計算器);btns.setborder(borderfactory. createloweredbevelborder();btns.setenabled( false );/按鈕不可操作btns.setpreferredsize( newdimension(20, 20);panel3 .add(btns);/加入按鈕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 變大小this.setlocation(300, 200);this.setdefaultclos

19、eoperation(jframe. exit_on_close);/* 統(tǒng)一設置按鈕的的使用方式* 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); /在面板上增加按鈕bt.setforeground(color); /設置前景（字 體）顏色bt.addactionlistener(a

20、ction); / 增加監(jiān) 聽事件/* 計算器的基礎操作（ + - ）* 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 );/* 運算符號的事件監(jiān)聽*/class signs implements actionlisten

21、erpublicactionperformed(actionevent e) /*void*用 actionevent對象的getactioncommand() 方法* 取得與引發(fā)事件對象相關的字符串 */string str = e.getactioncommand();/* sqrt 求平方根 */if(str.equals(sqrt)doubledouble. parsedoubleif(i=0)/*i =(tf.gettext();* string.valueof() 轉換為字符串* df.format() 按要求保留四位小數(shù)* math.sqrt() 求算數(shù)平方根 */tf.sett

22、ext(string. valueof(df.format(mat h.sqrt(i);elsetf.settext( 負 數(shù) 不 能 開 平 方 根);/* log 求常用對數(shù) */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( 負數(shù)不能求對數(shù) ); /* %求百分比 */else if(str.equals( %)tf.settext( df.format(do

23、uble. parsedouble (tf.gettext() / 100);/* 1/x 求倒數(shù) */else if(str.equals( 1/x )if(double. parsedouble(tf.gettext() = 0)tf.settext( 除數(shù)不能為零);else tf.settext( df.format(1double. parsedouble(tf.gettext();/* sin 求正弦函數(shù) */else if(str.equals( sin )doublei =double. parsedouble(tf.gettext();tf.settext(string. v

24、alueof(df.format(mat h.sin(i);/* cos 求余弦函數(shù) */else if(str.equals( cos )doublei =double. parsedouble(tf.gettext();tf.settext(string. valueof(df.format(mat h.cos(i);/* tan 求正切函數(shù) */else if(str.equals( tan )doublei =double. parsedouble(tf.gettext();tf.settext(string. valueof(df.format(mat h.tan(i);/* n! 求階乘 */else if(str.equals( n!)doublei =double. parsedouble(tf.gettext();if(i%2=0)|(i%2=1) / 判斷為整 數(shù)放進行階乘操作int j = ( int)i;/強制類型轉換 int result=1;for(int k=1;kif(tf.gettext().length() 1)tf.settext( tf.gettext().substring(0,tf.gettext().length() - 1);/使用退格刪除最后一位字符 elsetf.settext( 0);i