简易的计算器代码.docx
《简易的计算器代码.docx》由会员分享，可在线阅读，更多相关《简易的计算器代码.docx（19页珍藏版）》请在冰豆网上搜索。
简易的计算器代码
//版权所有唐嘉宁
importjava.awt.*;
importjavax.swing.*;
importjava.awt.event.*;
classMycomputeextendsJFrameimplementsActionListener{
/**
*
*/
privatestaticfinallongserialVersionUID=1L;
Containercon;
charch='#';
booleancan=false;
floatnum1=0;
JTextAreatj;
JButtonbutton1,button2,button3,button4,button5,button6,button7,
button8,button9,button10,button11,button12,button13,button14,
button15,button16,button17,button18,button19,button20,button21,
button22,button23,button24,button25,button26,button27,button28;
publicMycompute（）{
super（"计算器"）;
GridBagLayoutgridbag=newGridBagLayout（）;
GridBagConstraintsc=newGridBagConstraints（）;
con=this.getContentPane（）;
c.fill=GridBagConstraints.BOTH;
con.setFont（newFont（"Helvetica",Font.PLAIN,14））;
con.setLayout（gridbag）;
c.insets=newInsets（2,2,2,2）;
c.gridx=0;
c.gridy=0;
c.weightx=1.0;
c.gridwidth=5;
tj=newJTextArea（"0.0",5,0）;
gridbag.setConstraints（tj,c）;
tj.setEditable（false）;
con.add（tj）;
button1=newJButton（"MC"）;
c.gridx=0;
c.gridy=1;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button1,c）;
con.add（button1）;
button2=newJButton（"MR"）;
c.gridx=1;
c.gridy=1;
c.gridwidth=1;
gridbag.setConstraints（button2,c）;
con.add（button2）;
button3=newJButton（"MS"）;
c.gridx=2;
c.gridy=1;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button3,c）;
con.add（button3）;
button4=newJButton（"M+"）;
c.gridx=3;
c.gridy=1;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button4,c）;
con.add（button4）;
button5=newJButton（"M-"）;
c.gridx=4;
c.gridy=1;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button5,c）;
con.add（button5）;
button6=newJButton（"←"）;
c.gridx=0;
c.gridy=2;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button6,c）;
con.add（button6）;
button7=newJButton（"CE"）;
c.gridx=1;
c.gridy=2;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button7,c）;
con.add（button7）;
button8=newJButton（"C"）;
c.gridx=2;
c.gridy=2;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button8,c）;
con.add（button8）;
button9=newJButton（"±"）;
c.gridx=3;
c.gridy=2;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button9,c）;
con.add（button9）;
button10=newJButton（"√"）;
c.gridx=4;
c.gridy=2;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button10,c）;
con.add（button10）;
button11=newJButton（"7"）;
c.gridx=0;
c.gridy=3;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button11,c）;
con.add（button11）;
button12=newJButton（"8"）;
c.gridx=1;
c.gridy=3;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button12,c）;
con.add（button12）;
button13=newJButton（"9"）;
c.gridx=2;
c.gridy=3;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button13,c）;
con.add（button13）;
button14=newJButton（"/"）;
c.gridx=3;
c.gridy=3;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button14,c）;
con.add（button14）;
button15=newJButton（"%"）;
c.gridx=4;
c.gridy=3;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button15,c）;
con.add（button15）;
button16=newJButton（"4"）;
c.gridx=0;
c.gridy=4;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button16,c）;
con.add（button16）;
button17=newJButton（"5"）;
c.gridx=1;
c.gridy=4;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button17,c）;
con.add（button17）;
button18=newJButton（"6"）;
c.gridx=2;
c.gridy=4;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button18,c）;
con.add（button18）;
button19=newJButton（"*"）;
c.gridx=3;
c.gridy=4;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button19,c）;
con.add（button19）;
button20=newJButton（"1/χ"）;
c.gridx=4;
c.gridy=4;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button20,c）;
con.add（button20）;
button21=newJButton（"1"）;
c.gridx=0;
c.gridy=5;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button21,c）;
con.add（button21）;
button22=newJButton（"2"）;
c.gridx=1;
c.gridy=5;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button22,c）;
con.add（button22）;
button23=newJButton（"3"）;
c.gridx=2;
c.gridy=5;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button23,c）;
con.add（button23）;
button24=newJButton（"-"）;
c.gridx=3;
c.gridy=5;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button24,c）;
con.add（button24）;
button25=newJButton（"="）;
c.gridx=4;
c.gridy=5;
c.weightx=1.0;
c.gridwidth=1;
c.gridheight=0;
gridbag.setConstraints（button25,c）;
con.add（button25）;
button26=newJButton（"0"）;
c.gridx=0;
c.gridy=6;
c.weightx=1.0;
c.gridwidth=2;
gridbag.setConstraints（button26,c）;
con.add（button26）;
button27=newJButton（"."）;
c.gridx=2;
c.gridy=6;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button27,c）;
con.add（button27）;
button28=newJButton（"+"）;
c.gridx=3;
c.gridy=6;
c.weightx=1.0;
c.gridwidth=1;
gridbag.setConstraints（button28,c）;
con.add（button28）;
button6.addActionListener（this）;
button8.addActionListener（this）;
button9.addActionListener（this）;
button10.addActionListener（this）;
button11.addActionListener（this）;
button12.addActionListener（this）;
button13.addActionListener（this）;
button14.addActionListener（this）;
button15.addActionListener（this）;
button16.addActionListener（this）;
button17.addActionListener（this）;
button18.addActionListener（this）;
button19.addActionListener（this）;
button20.addActionListener（this）;
button21.addActionListener（this）;
button22.addActionListener（this）;
button23.addActionListener（this）;
button24.addActionListener（this）;
button25.addActionListener（this）;
button26.addActionListener（this）;
button27.addActionListener（this）;
button28.addActionListener（this）;
setSize（300,350）;
Toolkittl=this.getToolkit（）;
setLocation（（tl.getScreenSize（）.width-this.getWidth（））/2,（tl.getScreenSize（）.height-this.getHeight（））/2）;
setVisible（true）;
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
}
@Override
publicvoidactionPerformed（ActionEvente）{
//TODOAuto-generatedmethodstub
Stringact=e.getActionCommand（）;
if（e.getSource（）==button6）{
if（tj.getText（）.length（）>1）
tj.setText（tj.getText（）.substring（0,tj.getText（）.length（）-1））;
else
tj.setText（"0"）;
return;
}
if（e.getSource（）==button8）{
tj.setText（"0"）;
ch='#';
return;
}
if（act.equals（"±"））{
if（tj.getText（）.charAt（0）!
='-'）
tj.setText（"-"+tj.getText（））;
else
tj.setText（tj.getText（）.substring
（1））;
return;
}
if（act.equals（"."））{
tj.setText（tj.getText（）+act）;
return;
}
if（act!
="1/χ"&&act.charAt（0）>='0'&&act.charAt（0）<='9'）{
if（can）{
tj.setText（act）;
can=false;
}
else
{
try{
if（Float.parseFloat（tj.getText（））==0）
{
if（tj.getText（）.equals（"0."））
tj.setText（tj.getText（）+act）;
else
tj.setText（act）;
return;
}
else
{
tj.setText（tj.getText（）+act）;
return;
}
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
}
}
if（act.equals（"+"）||act.equals（"-"）||act.equals（"*"）||act.equals（"/"）||act.equals（"%"））{
if（ch!
='#'）{
try{
num1=cacu（num1,ch,Float.parseFloat（tj.getText（）））;
tj.setText（String.valueOf（num1））;
ch=act.charAt（0）;
can=true;
return;
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
}
else
{
try{
num1=Float.parseFloat（tj.getText（））;
ch=act.charAt（0）;
can=true;
return;
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
}
}
if（act.equals（"√"））{
try{
floatnum=（float）Math.sqrt（Float.parseFloat（tj.getText（）））;
tj.setText（String.valueOf（num））;
can=true;
return;
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
}
if（act.equals（"1/χ"））{
try{
floatnum=1/Float.parseFloat（tj.getText（））;
tj.setText（String.valueOf（num））;
can=true;
return;
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
catch（ArithmeticExceptione1）
{
JOptionPane.showMessageDialog（null,"除0错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;return;}
}
if（act.equals（"="））{
can=true;
try{if（ch=='#'）
return;
floatnum=Float.parseFloat（tj.getText（））;
num1=cacu（num1,ch,num）;
tj.setText（String.valueOf（num1））;
ch='#';
return;
}
catch（NumberFormatExceptione1）
{
JOptionPane.showMessageDialog（null,"输入格式错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return;
}
}
}
publicfloatcacu（floata,charc,floatb）{
floatsum;
switch（c）
{
case'+':
sum=a+b;
break;
case'-':
sum=a-b;
break;
case'*':
sum=a*b;
break;
case'/':
if（b==0）{
JOptionPane.showMessageDialog（null,"除0错误！
","警告！
",JOptionPane.ERROR_MESSAGE）;
return0;
}
sum=a/b;
break;
升级会员 