「java科学计算器」Java科学计算器的会遇到的问题和解决方法
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本文目录一览:
- 1、用JAVA编写的科学计算器源代码
- 2、Java编辑一个科学型计算器跟复合型计算器
- 3、求JAVA标准计算器与科学计算器转换源代码
- 4、求一个 JAVA 的 科学计算器 的 源代码最好里面有 sin cos 倒数、平方根、平方、立方高级一点的!
- 5、JAVA编程 模拟科学计算器 要求:界面模拟Windows中的计算器程序。实现基本数学运算、函数等功能:加、减、
用JAVA编写的科学计算器源代码
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class Counter extends WindowAdapter
{
static JFrame f=new JFrame("计算器");
static JTextField text1=new JTextField("0.");
static String source="";
static String cal="";
static String object="";
static boolean flag=false;
static boolean flag1=true;
static boolean flag2=false;
public void init()
{
try
{
Container c=f.getContentPane();
JPanel pan1=new JPanel();
JButton b1=new JButton("1");
JButton b2=new JButton("2");
JButton b3=new JButton("3");
JButton b4=new JButton("4");
JButton b5=new JButton("5");
JButton b6=new JButton("6");
JButton b7=new JButton("7");
JButton b8=new JButton("8");
JButton b9=new JButton("9");
JButton b0=new JButton("0");
JButton b11=new JButton("+");
JButton b12=new JButton("-");
JButton b13=new JButton("*");
JButton b14=new JButton("/");
JButton b15=new JButton(".");
JButton b16=new JButton("=");
JButton bclar=new JButton("清零");
text1.setHorizontalAlignment(JTextField.RIGHT);
c.add(text1,"North");
c.add(pan1);
A aa=new A();
Result re=new Result();
Opertion op=new Opertion();
Clar cl=new Clar();
b1.addActionListener(aa);
b2.addActionListener(aa);
b3.addActionListener(aa);
b4.addActionListener(aa);
b5.addActionListener(aa);
b6.addActionListener(aa);
b7.addActionListener(aa);
b8.addActionListener(aa);
b9.addActionListener(aa);
b0.addActionListener(aa);
b11.addActionListener(op);
b12.addActionListener(op);
b13.addActionListener(op);
b14.addActionListener(op);
b16.addActionListener(re);
b15.addActionListener(aa);
bclar.addActionListener(cl);
pan1.add(b1);
pan1.add(b2);
pan1.add(b3);
pan1.add(b11);
pan1.add(b4);
pan1.add(b5);
pan1.add(b6);
pan1.add(b12);
pan1.add(b7);
pan1.add(b8);
pan1.add(b9);
pan1.add(b13);
pan1.add(b0);
pan1.add(b15);
pan1.add(b16);
pan1.add(b14);
pan1.add(bclar);
f.setSize(200,220);
f.setVisible(true);
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
class A implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String a=text1.getText();
String s=e.getActionCommand();
if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))
text1.setText(s);
else {
if(flag2)
{
text1.setText(s);
flag2=false;
}
else
text1.setText(a+s);
}
}
}
class Opertion implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
cal=e.getActionCommand();
if(flag1==true)
source=text1.getText();
text1.setText(cal);
flag1=false;
flag=true;
}
}
class Result implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
double num1;
num1=Double.parseDouble(source);
object=text1.getText();
double num2;
num2=Double.parseDouble(object);
double result=0;
if(cal.equals("+"))
result=num1+num2;
if(cal.equals("-"))
result=num1-num2;
if(cal.equals("*"))
result=num1*num2;
if(cal.equals("/"))
if(num2==0)
text1.setText("除数不能为0");
else
result=num1/num2;
String s1=Double.toString(result);
text1.setText(s1);
flag1=true;
flag2=true;
}
}
class Clar implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
text1.setText("0.");
}
}
public static void main(String[] args)
{
Counter count=new Counter();
count.init();
}
public void windowClosing(WindowEvent e){
System.exit(1);
}
public void windowOpened(WindowEvent e){}
public void windowIconified(WindowEvent e){}
public void windowDeiconified(WindowEvent e){}
public void windowClosed(WindowEvent e){}
public void windowActivated(WindowEvent e){}
public void windowDeactivated(WindowEvent e){}
}
Java编辑一个科学型计算器跟复合型计算器
Java编辑一个科学型计算器跟复合型计算器:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import java.awt.GridLayout;
import javax.swing.JButton;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List; public class CalculaterYYWF extends JFrame {
private JPanel contentPane;
private JTextField textField;
private ListString listSign = new ArrayListString();
private ListDouble listNum = new ArrayListDouble(); public static void main(String[] args) {
new CalculaterYYWF();
} public CalculaterYYWF() {
setResizable(false);
setBackground(new Color(240, 255, 240));
setTitle("有猿无粉牌计算器");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 265, 375);
contentPane = new JPanel();
contentPane.setBackground(new Color(224, 255, 255));
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
textField = new JTextField();
textField.setBounds(10, 10, 237, 44);
contentPane.add(textField);
textField.setColumns(10);
JPanel panel = new JPanel();
panel.setBackground(new Color(224, 255, 255));
panel.setBounds(10, 64, 237, 273);
contentPane.add(panel);
panel.setLayout(new GridLayout(5, 4, 5, 5));
String stmp = "123+456-789*0.%/()";
for (int i = 0; i 18; i++) {
JButton j = new JButton(String.valueOf(stmp.charAt(i)));
j.setActionCommand(j.getText());
panel.add(j);
j.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
textField.setText(textField.getText().trim()
+ e.getActionCommand());
}
});
}
JButton bt_clear = new JButton("C");
panel.add(bt_clear);
bt_clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
textField.setText("");
}
});
JButton bt_deng = new JButton("=");
panel.add(bt_deng);
bt_deng.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String expression = textField.getText();
bracketResolve(expression);
}
});
setVisible(true);
} // 逐层消括号并计算
public void bracketResolve(String exp) {
String strjs = convertString(exp);
} }
求JAVA标准计算器与科学计算器转换源代码
importjava.awt.*;importjava.awt.event.*;importjava.lang.*;importjavax.swing.*;publicclassCounterextendsFrame{//声明三个面板的布局GridLayoutgl1,gl2,gl3;Panelp0,p1,p2,p3;JTextFieldtf1;TextFieldtf2;Buttonb0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;StringBufferstr;//显示屏所显示的字符串doublex,y;//x和y都是运算数intz;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"staticdoublem;//记忆的数字publicCounter(){gl1=newGridLayout(1,4,10,0);//实例化三个面板的布局gl2=newGridLayout(4,1,0,15);gl3=newGridLayout(4,5,10,15);tf1=newJTextField(27);//显示屏tf1.setHorizontalAlignment(JTextField.RIGHT);tf1.setEnabled(false);tf1.setText("0");tf2=newTextField(10);//显示记忆的索引值tf2.setEditable(false);//实例化所有按钮、设置其前景色并注册监听器b0=newButton("Backspace");b0.setForeground(Color.red);b0.addActionListener(newBt());b1=newButton("CE");b1.setForeground(Color.red);b1.addActionListener(newBt());b2=newButton("C");b2.setForeground(Color.red);b2.addActionListener(newBt());b3=newButton("MC");b3.setForeground(Color.red);b3.addActionListener(newBt());b4=newButton("MR");b4.setForeground(Color.red);b4.addActionListener(newBt());b5=newButton("MS");b5.setForeground(Color.red);b5.addActionListener(newBt());b6=newButton("M+");b6.setForeground(Color.red);b6.addActionListener(newBt());b7=newButton("7");b7.setForeground(Color.blue);b7.addActionListener(newBt());b8=newButton("8");b8.setForeground(Color.blue);b8.addActionListener(newBt());b9=newButton("9");b9.setForeground(Color.blue);b9.addActionListener(newBt());b10=newButton("/");b10.setForeground(Color.red);b10.addActionListener(newBt());b11=newButton("sqrt");b11.setForeground(Color.blue);b11.addActionListener(newBt());b12=newButton("4");b12.setForeground(Color.blue);b12.addActionListener(newBt());b13=newButton("5");b13.setForeground(Color.blue);b13.addActionListener(newBt());b14=newButton("6");b14.setForeground(Color.blue);b14.addActionListener(newBt());b15=newButton("*");b15.setForeground(Color.red);b15.addActionListener(newBt());b16=newButton("%");b16.setForeground(Color.blue);b16.addActionListener(newBt());b17=newButton("1");b17.setForeground(Color.blue);b17.addActionListener(newBt());b18=newButton("2");b18.setForeground(Color.blue);b18.addActionListener(newBt());b19=newButton("3");b19.setForeground(Color.blue);b19.addActionListener(newBt());b20=newButton("-");b20.setForeground(Color.red);b20.addActionListener(newBt());b21=newButton("1/X");b21.setForeground(Color.blue);b21.addActionListener(newBt());b22=newButton("0");b22.setForeground(Color.blue);b22.addActionListener(newBt());b23=newButton("+/-");b23.setForeground(Color.blue);b23.addActionListener(newBt());b24=newButton(".");b24.setForeground(Color.blue);b24.addActionListener(newBt());b25=newButton("+");b25.setForeground(Color.red);b25.addActionListener(newBt());b26=newButton("=");b26.setForeground(Color.red);b26.addActionListener(newBt());//实例化四个面板p0=newPanel();p1=newPanel();p2=newPanel();p3=newPanel();//创建一个空字符串缓冲区str=newStringBuffer();//添加面板p0中的组件和设置其在框架中的位置和大小p0.add(tf1);p0.setBounds(10,25,300,40);//添加面板p1中的组件和设置其在框架中的位置和大小p1.setLayout(gl1);p1.add(tf2);p1.add(b0);p1.add(b1);p1.add(b2);p1.setBounds(10,65,300,25);//添加面板p2中的组件并设置其的框架中的位置和大小p2.setLayout(gl2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.setBounds(10,110,40,150);//添加面板p3中的组件并设置其在框架中的位置和大小p3.setLayout(gl3);//设置p3的布局p3.add(b7);p3.add(b8);p3.add(b9);p3.add(b10);p3.add(b11);p3.add(b12);p3.add(b13);p3.add(b14);p3.add(b15);p3.add(b16);p3.add(b17);p3.add(b18);p3.add(b19);p3.add(b20);p3.add(b21);p3.add(b22);p3.add(b23);p3.add(b24);p3.add(b25);p3.add(b26);p3.setBounds(60,110,250,150);//设置框架中的布局为空布局并添加4个面板setLayout(null);add(p0);add(p1);add(p2);add(p3);setResizable(false);//禁止调整框架的大小//匿名类关闭窗口addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente1){System.exit(0);}});setBackground(Color.lightGray);setBounds(100,100,320,280);setVisible(true);}//构造监听器classBtimplementsActionListener{publicvoidactionPerformed(ActionEvente2){try{if(e2.getSource()==b1)//选择"CE"清零{tf1.setText("0");//把显示屏清零str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数}elseif(e2.getSource()==b2)//选择"C"清零{tf1.setText("0");//把显示屏清零str.setLength(0);}elseif(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数{x=Double.parseDouble(tf1.getText().trim());tf1.setText(""+(-x));}elseif(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值{x=Double.parseDouble(tf1.getText().trim());str.setLength(0);//清空缓冲区以便接收新的另一个运算数y=0d;z=0;}elseif(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值{x=Double.parseDouble(tf1.getText().trim());str.setLength(0);y=0d;z=1;}elseif(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值{x=Double.parseDouble(tf1.getText().trim());str.setLength(0);y=0d;z=2;}elseif(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值{x=Double.parseDouble(tf1.getText().trim());str.setLength(0);y=0d;z=3;}elseif(e2.getSource()==b26)//单击等号按钮输出计算结果{str.setLength(0);switch(z){case0:tf1.setText(""+(x+y));break;case1:tf1.setText(""+(x-y));break;case2:tf1.setText(""+(x*y));break;case3:tf1.setText(""+(x/y));break;}}elseif(e2.getSource()==b24)//单击"."按钮输入小数{if(tf1.getText().trim().indexOf(′.′)!=-1)//判断字符串中是否已经包含了小数点{}else//如果没数点有小{if(tf1.getText().trim().equals("0"))//如果初时显示为0{str.setLength(0);tf1.setText((str.append("0"+e2.getActionCommand())).toString());}elseif(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作{}else{tf1.setText(str.append(e2.getActionCommand()).toString());}}y=0d;}elseif(e2.getSource()==b11)//求平方根{x=Double.parseDouble(tf1.getText().trim());tf1.setText("数字格式异常");if(x0)tf1.setText("负数没有平方根");elsetf1.setText(""+Math.sqrt(x));str.setLength(0);y=0d;}elseif(e2.getSource()==b16)//单击了"%"按钮{x=Double.parseDouble(tf1.getText().trim());tf1.setText(""+(0.01*x));str.setLength(0);y=0d;}elseif(e2.getSource()==b21)//单击了"1/X"按钮{x=Double.parseDouble(tf1.getText().trim());if(x==0){tf1.setText("除数不能为零");}else{tf1.setText(""+(1/x));}str.setLength(0);y=0d;}elseif(e2.getSource()==b3)//MC为清除内存{m=0d;tf2.setText("");str.setLength(0);}elseif(e2.getSource()==b4)//MR为重新调用存储的数据{if(tf2.getText().trim()!="")//有记忆数字{tf1.setText(""+m);}}elseif(e2.getSource()==b5)//MS为存储显示的数据{m=Double.parseDouble(tf1.getText().trim());tf2.setText("M");tf1.setText("0");str.setLength(0);}elseif(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR{m=m+Double.parseDouble(tf1.getText().trim());}else//选择的是其他的按钮{if(e2.getSource()==b22)//如果选择的是"0"这个数字键{if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作{}else{tf1.setText(str.append(e2.getActionCommand()).toString());y=Double.parseDouble(tf1.getText().trim());}}elseif(e2.getSource()==b0)//选择的是“BackSpace”按钮{if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零{if(str.length()!=1){tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常}else{tf1.setText("0");str.setLength(0);}}y=Double.parseDouble(tf1.getText().trim());}else//其他的数字键{tf1.setText(str.append(e2.getActionCommand()).toString());y=Double.parseDouble(tf1.getText().trim());}}}catch(NumberFormatExceptione){tf1.setText("数字格式异常");}catch(StringIndexOutOfBoundsExceptione){tf1.setText("字符串索引越界");}}}publicstaticvoidmain(Stringargs[]){newCounter();}}
求一个 JAVA 的 科学计算器 的 源代码最好里面有 sin cos 倒数、平方根、平方、立方高级一点的!
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator implements ActionListener
{
String s="",s1;
double d1,d2;
JFrame jf = new JFrame("小计算器by Graduate") ;
JTextField tf = new JTextField();
public void init()//实现计算器界面
{
Container c=jf.getContentPane();
tf.setHorizontalAlignment(JTextField.RIGHT);//文本框
c.add(tf,"North");
JPanel pn3 = new JPanel(new BorderLayout());
c.add(pn3,"Center");
JPanel pn2 = new JPanel();//功能键界面(清除键和关闭键)
pn2.setLayout(new BorderLayout());
JPanel pn1 = new JPanel();//运算界面
pn1.setLayout(new GridLayout(4,4));
pn3.add(pn2,"North");
pn3.add(pn1);
//设置按钮
JButton b = new JButton("CLEAR");
b.setToolTipText("请按清除键!");//设置清零键
b.setForeground(Color.RED);//设置字体颜色
b.setBackground(Color.YELLOW);//设置背景色
b.addActionListener(this);
pn2.add(b,"Center");
b = new JButton("OFF");
b.setToolTipText("请按退出键!");//设置off键,点击退出应用程序b.addActionListener(this);
b.setForeground(Color.RED);//字体颜色
b.setBackground(Color.ORANGE);//背景色
pn2.add(b,"East");
b = new JButton("1");//add butten 1
b.addActionListener(this);
pn1.add(b);
b = new JButton("2");//add butten 2
b.addActionListener(this);
pn1.add(b);
b = new JButton("3");//add butten 3
b.addActionListener(this);
pn1.add(b);
b = new JButton("+");//add butten +
b.setForeground(Color.BLUE);//设置字体颜色
b.addActionListener(this);
pn1.add(b);
b = new JButton("4");//add butten 4
b.addActionListener(this);
pn1.add(b);
b = new JButton("5");//add butten 5
b.addActionListener(this);
pn1.add(b);
b = new JButton("6");//add button 6
b.addActionListener(this);
pn1.add(b);
b = new JButton("-");//add button -
b.setForeground(Color.BLUE);//设置字体颜色
b.addActionListener(this);
pn1.add(b);
b = new JButton("7");//add button 7
b.addActionListener(this);
pn1.add(b);
b = new JButton("8");//add button 8
b.addActionListener(this);
pn1.add(b);
b = new JButton("9");//add button 9
b.addActionListener(this);
pn1.add(b);
b = new JButton("*");//add button *
b.setForeground(Color.BLUE);//设置字体颜色
b.addActionListener(this);
pn1.add(b);
b = new JButton("0");//add button 0
b.addActionListener(this);
pn1.add(b);
b = new JButton(".");//add button .
b.addActionListener(this);
pn1.add(b);
b = new JButton("=");//add button =
b.setForeground(Color.RED);//设置字体颜色
b.addActionListener(this);
pn1.add(b);
b = new JButton("\\");//add button \
b.setForeground(Color.BLUE);//设置字体颜色
b.addActionListener(this);
pn1.add(b);
jf.setSize(300,300);//设置大小
jf.setVisible(true);//设置为可视
}
//处理按钮按下时的动作,进行相应的处理
public void actionPerformed(ActionEvent e)
{
String command = e.getActionCommand();
tf.setText(tf.getText()+command);
if(command.equals("CLEAR")) //清零键 按下时返回初始状态
{
s1=null;
s="";
tf.setText("");//记录输入值的变量清空
}
else if(command.equals("OFF")) System.exit(0);//off键 关闭应用程序
else if(!command.equals("*")!command.equals("\\")
!command.equals("+")!command.equals("-")
!command.equals("="))//判断输入是否为数字
{
if(s1==null)//判断输入是否为第一个
s1 = command;
else s1+=command;
d1 = new Double(s1).doubleValue();//字符串型转换为双精度型,还原输入数字
try
{
if(s.equals("+")) d1 = d1+d2;//加法运算
else if(s.equals("-")) d1 = d2-d1;//减法运算
else if(s.equals("*")) d1 = d1*d2;//乘法运算
else if(s.equals("\\"))d1 = d2/d1;//除法运算
}
catch(Exception ex)
{
tf.setText("Error");//错误显示"Error"
System.out.println(ex.getMessage());
}
}
else if(!command.equals("=")) //判断输入是否为+ - * \
{
s = command;
s1 = null;
d2 = d1;
}
else//输入=时,显示运算结果
{
tf.setText(tf.getText()+d1);
}
}
public static void main(String [] args)
{
new Calculator().init();
}
}
JAVA编程 模拟科学计算器 要求:界面模拟Windows中的计算器程序。实现基本数学运算、函数等功能:加、减、
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator implements ActionListener{
private double data1=0.0,data2=0.0;
private String t_content;
boolean number=false;
//key用来标示用户所按下的按钮即加减乘除
//key为0标示+,为1表示-,为2表示*,为3表示/
short key=-1;
//pkey的取值为-1~5
//pkey为-1表示第一次按下=按钮,为5说明不是第一次按下=按钮
//pkey为其他值0,1,2,3时分别代表+,-,*,/
short pkey=-1;
Frame frame=new Frame("Calculator");//定义标题为Calculator的窗体
TextField textfield=new TextField(30);//定义计算机
//定义backspace,ce,c0按钮
Button backspace=new Button("Backspace");
Button ce=new Button("CE");
Button c0=new Button("C");
//定义面板,其中backspace,ce,c0按钮和计算机兰textfeild放在面板p1中
//其余按钮放在面板p2中
Panel p1=new Panel();
Panel p2=new Panel();
//定义界面上的按钮数组,即除去backspace,ce,c0按钮的所有按钮
String names[]={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
Button bb[]=new Button[names.length];
public static void main(String[] args){
Calculator cal=new Calculator();
cal.go();
}
public void go(){
frame.setSize(300,200);
frame.setLayout(new BorderLayout());
Font fonts=new Font("楷体_GB2312",Font.PLAIN,12); // 第一页
//设置面板p1的字体和布局管理类型,将textfeild对象添加到面板中
p1.setFont(fonts);
p1.setLayout(new GridLayout(2,1,5,10));
textfield.setFont(fonts);
p1.add(textfield,null);
//backspace,ce,c0按钮注册addActionListener方法
backspace.addActionListener(this);
ce.addActionListener(this);
c0.addActionListener(this);
//将backspace,ce,c0按钮添加到p1面板中
p1.add(backspace,null);
p1.add(ce,null);
p1.add(c0,null);
//设置面板p2的布局管理器类型为GridLayout
p2.setLayout(new GridLayout(4,5,5,5));
//为按钮组中的按钮注册addActionListener方法
for(int i=0;inames.length;i++){
bb[i]=new Button(names[i]);
p2.add(bb[i]);
bb[i].addActionListener(this);
}
//设置面板p1和面板p2在窗体中的位置
//面板p1在窗体的North方向,面板p2在窗体的South方向
frame.add(p1,BorderLayout.NORTH);
frame.add(p2,BorderLayout.SOUTH);
frame.setVisible(true);
//当单击关闭按钮时退出系统
frame.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent ae){
String s;
//通过ActionEvent类的getActionCommand()方法,得出动作是由哪个按钮触发的。 //第二页
s=ae.getActionCommand();
//用户单击一次,计算栏里便去掉一个字符
//先将计算栏里的字符清空,再添加除最好一个字符的字符串
if(s.equals("Backspace")number){
t_content=textfield.getText();
textfield.setText("");
for(int i=0;it_content.length()-1;i++){
char c=t_content.charAt(i);
textfield.setText(textfield.getText()+c);
}
}
//用户单击的是CE按钮,计算栏清空
if(s.equals("CE")){
textfield.setText("");
number=false;
}
//用户单击的是C按钮
if(s.equals("C")){
textfield.setText("");
data1=data2=0.0;
number=false;
}
//用户单击的是sqrt按钮,其中负数不能被开方
if(s.equals("sqrt")number){
t_content=textfield.getText();
if(t_content.charAt(0)=='-'){
textfield.setText("负数不能被开方");
number=false;
}else{
textfield.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(t_content))));
}
}
//用户单击的是1/x求倒数按钮,求倒数时分母不能为0
if(s.equals("1/x") number){
t_content=textfield.getText();
if(t_content.equals("0")){ //第三页
textfield.setText("零不能求倒数");
number=false;
}else{
textfield.setText(Double.toString(1/Double.parseDouble(t_content)));
}
}
//用户单击的是%按钮
if(s.equals("%")number){
if(data2==0){
t_content=textfield.getText();
textfield.setText(t_content);
}else{
boolean g=false;
for(int i=0;itextfield.getText().length();i++)
if('.'==textfield.getText().charAt(i)){
g=true;
break;
}
//如果是Double 数,除100
if(g=true){
double dtemp=Double.parseDouble(textfield.getText());
dtemp=dtemp/100.0;
textfield.setText(Double.toString(dtemp));
}
//如果是int数但能被100整除,则去掉末尾两个0
else{
if(Integer.parseInt(textfield.getText())%100==0){
int itemp=Integer.parseInt(textfield.getText());
itemp/=100;
textfield.setText(Integer.toString(itemp));
}
//如果是int数,但不能被100整除,则按Double数处理
else{
double dtemp=Double.parseDouble(textfield.getText());
dtemp=dtemp/100.0;
textfield.setText(Double.toString(dtemp));
}
}
} //第四页
}
//对正负数字的处理
if(s.equals("+/-")){
t_content=textfield.getText();
if(t_content.charAt(0)=='-'){
textfield.setText("");
String content;
for(int i=1;it_content.length();i++){
textfield.setText(textfield.getText()+t_content.charAt(i));
}
}else{
textfield.setText("-"+t_content);
}
}
//所按下的按钮为+按钮
if(s.equals("+")){
switch(pkey){
case 0:
data2+=Double.parseDouble(textfield.getText());
break;
case 1:
data2+=Double.parseDouble(textfield.getText());
break;
case 2:
data2+=Double.parseDouble(textfield.getText());
break;
case 3:
if(textfield.getText().equals("0")){
textfield.setText("除数不能为零");
number=false;
}else{
key=-1;
data2/=data1;
textfield.setText(Double.toString(data2));
break;
}
default:
data2=Double.parseDouble(textfield.getText());
}
pkey=key=0;
textfield.setText("");
}
//第五页
//所按下的按钮为-按钮
if(s.equals("-")){
switch(pkey){
case 0:
data2+=Double.parseDouble(textfield.getText());
break;
case 1:
data2+=Double.parseDouble(textfield.getText());
break;
case 2:
data2+=Double.parseDouble(textfield.getText());
break;
case 3:
if(textfield.getText().equals("0")){
textfield.setText("除数不能为零");
number=false;
}else{
key=-1;
data2/=data1;
textfield.setText(Double.toString(data2));
break;
}
default:
data2=Double.parseDouble(textfield.getText());
}
pkey=key=1;
textfield.setText("");
}
//所按下的按钮为*按钮
if(s.equals("*")){
switch(pkey){
case 0:
data2+=Double.parseDouble(textfield.getText());
break;
case 1:
data2+=Double.parseDouble(textfield.getText());
break;
case 2:
data2+=Double.parseDouble(textfield.getText());
break;
case 3:
if(textfield.getText().equals("0")){ // 第六页
textfield.setText("除数不能为零");
number=false;
}else{
key=-1;
data2/=data1;
textfield.setText(Double.toString(data2));
break;
}
default:
data2=Double.parseDouble(textfield.getText());
}
pkey=key=2;
textfield.setText("");
}
//所按下的按钮为/按钮
if(s.equals("/")){
switch(pkey){
case 0:
data2+=Double.parseDouble(textfield.getText());
break;
case 1:
data2+=Double.parseDouble(textfield.getText());
break;
case 2:
data2+=Double.parseDouble(textfield.getText());
break;
case 3:
if(textfield.getText().equals("0")){
textfield.setText("除数不能为零");
number=false;
}else{
key=-1;
data2/=data1;
textfield.setText(Double.toString(data2));
break;
}
default:
data2=Double.parseDouble(textfield.getText());
}
pkey=key=3;
textfield.setText("");
} //第七页
//所按下的按钮为=,求结果
if(s.equals("=")number){
//如果不是第一次按下=按钮
if(pkey==5){
switch(pkey){
case 0:
data2+=data1;
textfield.setText(Double.toString(data2));
break;
case 1:
data2-=data1;
textfield.setText(Double.toString(data2));
break;
case 2:
data2*=data1;
textfield.setText(Double.toString(data2));
break;
case 3:
if(textfield.getText().equals("0")){
textfield.setText("除数不能为零");
number=false;
}else{
data2/=data1;
textfield.setText(Double.toString(data2));
break;
}
}
}
//如果是第一次按下=按钮
else{
data1=Double.parseDouble(textfield.getText());
switch(key){
case 0:
key=-1;
data2+=Double.parseDouble(textfield.getText());
textfield.setText(Double.toString(data2));
break;
case 1:
key=-1;
data2-=Double.parseDouble(textfield.getText());
textfield.setText(Double.toString(data2)); //第八页
break;
case 2:
key=-1;
data2*=Double.parseDouble(textfield.getText());
textfield.setText(Double.toString(data2));
break;
case 3:
if(textfield.getText().equals("0")){
textfield.setText("除数不能为零");
number=false;
}else{
key=-1;
data2/=Double.parseDouble(textfield.getText());
textfield.setText(Double.toString(data2));
break;
}
}
}
pkey=5;
}
//按下的按钮时数字按钮
else{
switch(s.charAt(0)){
case'0':
case'1':
case'2':
case'3':
case'4':
case'5':
case'6':
case'7':
case'8':
case'9':
number=true;
textfield.setText(textfield.getText()+s);
break;
//对.的处理
case'.':
t_content=textfield.getText();
boolean g=false; //第九页
//对计算机栏中的数据进行检验
//如果其中有小数点,则用户单击该按钮时不在添加小数点
for(int i=0;it_content.length();i++){
if(t_content.charAt(i)=='.'){
g=true;
break;
}
}
//数据中已经有小数点
if(g==true)
break;
// 数据中没有小数点,当用户单击小数点时添加小数点
if(g==false)
textfield.setText(t_content+".");
}
}
}
private String Integer(String string) {
// TODO Auto-generated method stub
return null;
}
}
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