import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import javax.swing.*;
public class Counter extends Frame
{
//声明三个面板的布局
JTextField tf1;
StringBuffer str;//显示屏所显示的字符串
double x,y;//x和y都是运算数
static double m;//记忆的数字
public Counter()
tf1.setHorizontalAlignment(JTextField.RIGHT);
tf1.setEnabled(false);
tf1.setText("0");
//实例化所有按钮、设置其前景色并注册监听器
b0=new Button("Backspace");
b0.setForeground(Color.red);
b0.addActionListener(new Bt());
b1=new Button("CE");
b1.setForeground(Color.red);
b1.addActionListener(new Bt());
b10=new Button("/");
b10.setForeground(Color.red);
b10.addActionListener(new Bt());
b11=new Button("sqrt");
b11.setForeground(Color.blue);
b11.addActionListener(new Bt());
//实例化四个面板
p0=new Panel();
p1=new Panel();
//创建一个空字符串缓冲区
str=new StringBuffer();
//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);
//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(b0);
p1.add(b1);
setLayout(null);
add(p0);
add(p1);
setResizable(false);//禁止调整框架的大小
//匿名类关闭窗口
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e1)
System.exit(0);
}
});
setBackground(Color.lightGray);
setVisible(true);
//构造监听器
class Bt implements ActionListener
try{
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
str.setLength(0);
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(-x));
str.setLength(0);//清空缓冲区以便接收新的另一个运算数
y=0d;
z=0;
z=1;
switch(z)
case 0 : tf1.setText(""+(x+y));break;
case 1 : tf1.setText(""+(x-y));break;
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
else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作
else
tf1.setText("数字格式异常");
if(x0)
tf1.setText("负数没有平方根");
tf1.setText(""+Math.sqrt(x));
tf1.setText(""+(0.01*x));
if(x==0)
tf1.setText("除数不能为零");
tf1.setText(""+(1/x));
m=0d;
tf1.setText(""+m);
m=Double.parseDouble(tf1.getText().trim());
m=m+Double.parseDouble(tf1.getText().trim());
else//选择的是其他的按钮
if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作
y=Double.parseDouble(tf1.getText().trim());
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//其他的数字键
catch(NumberFormatException e){
catch(StringIndexOutOfBoundsException e){
tf1.setText("字符串索引越界");
public static void main(String args[])
new Counter();
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
class Stack_Float
float nums[];
int top;
Stack_Float()
top = -1;
boolean IsEmpty()
if (top == -1)
return true;
return false;
float Pop_Stack()
return 0;
top--;
return nums[top + 1];
float GetTop()
return nums[top];
void Push_Stack(float num)
return;
top++;
nums[top] = num;
class Stack_Char
char str[];
Stack_Char()
boolean CanPush(char c)
int temp = top;
if (c == '(')
while (temp != -1)
if (str[temp] == '(')
temp--;
temp = top;
if (c == '[')
if (str[temp] == '[' || str[temp] == '(')
if (c == '{')
if (str[temp] == '{' || str[temp] == '[' || str[temp] == '(')
void Push_Stack(char ch)
str[top] = ch;
char Pop_Stack()
return '\0';
return str[top + 1];
char GetTop()
System.out.print("error");
return str[top];
public class jisuanqi extends javax.swing.JFrame implements ActionListener
JTextField text = new JTextField();
JTextField text1 = new JTextField();
JButton jButton1 = new JButton();
JButton jButton10 = new JButton();
JButton jButton11 = new JButton();
String show = "";
public jisuanqi()
initComponents();
char[] TranSmit(char str[])
int i = 0, j = 0;
char c = str[i];
Stack_Char s = new Stack_Char(); // 存放运算符的栈
while (c != '=') // 对算术表达式扫描未结束时
houzhui[j] = c;
j++;
i++;
c = str[i];
houzhui[j] = '#';// 用#隔开数字
switch (c) // 扫描到运算符时
case '+':
case '-':
case '*':
case '/':
case '(':
case '[':
case '{':
if (s.IsEmpty() == true) // 栈空,直接入栈
s.Push_Stack(c);
break;
if (ComPare(s.GetTop(), c) == -1) {
s.Push_Stack(c); // 入栈
if (ComPare(s.GetTop(), c) == 1) {
houzhui[j] = s.Pop_Stack();// 出栈元素存入后缀表达式
case ')': // 扫描到 )
while (s.GetTop() != '(') // 未扫描到 ( 时,出栈
houzhui[j] = s.Pop_Stack();
s.Pop_Stack(); // '(' 出栈
case ']': // 扫描到 ]
while (s.GetTop() != '[') // 未扫描到 [ 时,出栈
s.Pop_Stack(); // '[' 出栈
case '}': // 扫描到 }
while (s.GetTop() != '{') // 未扫描到 { 时,出栈
s.Pop_Stack(); // '{' 出栈
while (s.IsEmpty() != true)// 把剩余的运算符直接出栈
houzhui[j] = '=';// 后缀表达式后面加 =
houzhui[j] = '\0';
return houzhui;
float Count(char str[])
Stack_Float s = new Stack_Float();// 定义存放数字的栈
char c = str[0];
int i = 0;
float result = 0, temp, left, right;
while (c != '=') // 未扫描到 = 时
temp = 0;
while (c != '#')// 未读到分隔符时
temp = temp * 10 + c - '0';
s.Push_Stack(temp);// 进栈
switch (c)// 扫描到运算符时
s.Push_Stack(result);// 最后得数进栈
right = s.Pop_Stack();// 右操作数出栈
left = s.Pop_Stack();// 左操作数出栈
result = left - right;
s.Push_Stack(result);
result = left / right;
return result;
int ComPare(char a, char b) // 判断运算符的优先级函数
int s[][] = {// 栈顶元素高于算术表达式中的元素时, 返回 1,否则返回 -1
{ 1, 1, -1, -1, -1, 1, -1, 1, -1, 1 },
{ 1, 1, 1, 1, -1, 1, -1, 1, -1, 1 },
{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, 1, -1, -1, -1, -1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, 1 },
{ 1, 1, 1, 1, -1, -1, -1, -1, -1, -1 } };
char x1[] = { '+', '-', '*', '/', '(', ')', '[', ']', '{', '}' };// 栈顶元素
int k = 0, m, n = 0;
for (n = 0; n 10; n++)
k = 1;
break; // 找到比较结果后,跳出循环
if (k == 1)
return s[m][n];// 返回比较结果
public void actionPerformed(ActionEvent e)
if (e.getSource() == jButton1)
show += "1";
text.setText(show);
if (e.getSource() == jButton10)
show += "0";
if (e.getSource() == jButton11)
show += "+";
show += "-";
show += "*";
show += "/";
show += "(";
show += ")";
show += "[";
show += "]";
show += "{";
show += "}";
show = "";
text.setText("");
text1.setText("");
show += "=";
float result = 0;
str1 = show.toCharArray();
text.setText("" + result);
private void initComponents()
jButton1.setText("1");
jButton10.setText("0");
jButton11.setText("+");
jButton1.addActionListener(this);
jButton10.addActionListener(this);
jButton11.addActionListener(this);
add(text);
add(text1);
add(jButton1);
add(jButton10);
add(jButton11);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
new jisuanqi();
示例代码如下,请参考：
package?test.com.test;
import?java.awt.*;
import?java.awt.event.*;
import?javax.swing.*;
public?class?Cal?{
StringBuffer?s1?=?new?StringBuffer();?//记录运算数字,以及保留结果
static?String?flag?=?new?String();?//标记运算符号：+,-,*,/
boolean?start?=?true;?//标记运算开始或结束,保证一次运算之后,第二次进行运算时能同时清空显示界面,即s1为空
public?void?init(){
//主界面
JFrame?f?=?new?JFrame("计算器");
JPanel?p1?=?new?JPanel();
p1.add(tf);
f.add(p1,BorderLayout.NORTH);
//动作监听器
ActionListener?listen?=new?ActionListener()?{
public?void?actionPerformed(ActionEvent?arg0)?{
if(arg0.getActionCommand()=="0"){
if(!s1.toString().equals(new?String())){
if(!start){
//s1清零,保证可以重新输入数字
s1.delete(0,?s1.length());
start?=?true;
tf.setText(s1.append("0").toString());
}?
if(arg0.getActionCommand()=="1"){
tf.setText(s1.append("1").toString());
//输入小数点
if(arg0.getActionCommand()=="."){
start=true;
if(s1.toString().equals(new?String()))
tf.setText(s1.append("0.").toString());
else?if(s1.length()==1s1.charAt(0)=='-')
tf.setText(s1.append(".").toString());
//输入负号
if(arg0.getActionCommand()=="+/-"){
tf.setText(s1.append('-').toString());
//退格Backspace
if(arg0.getActionCommand()=="Backspace"){
if(s1.length()!=0){
//删除最后输入的一位
s1.deleteCharAt(s1.length()-1);
tf.setText(s1.toString());
//归零CE
if(arg0.getActionCommand()=="CE"){
//清空所有,start标记设为true
//清除C
if(arg0.getActionCommand()=="C"){
//清空当前输入,即s1清零
//加号
if(arg0.getActionCommand()=="+"){
flag="+";
//s1清零,重新接收下一个数据
//减号
if(arg0.getActionCommand()=="-"){
flag="-";
//乘号
if(arg0.getActionCommand()=="*"){
flag="*";
//除号
if(arg0.getActionCommand()=="/"){
flag="/";
//开根号
if(arg0.getActionCommand()=="sqrt"){
start?=false;
double?s=Double.parseDouble(s1.toString());
tf.setText(s1.append(String.valueOf(Math.sqrt(s))).toString());
//求%
if(arg0.getActionCommand()=="%"){
tf.setText(s1.append(String.valueOf(s/100)).toString());
//求1/x
if(arg0.getActionCommand()=="1/x"!s1.toString().equals(new?String())Double.parseDouble(s1.toString())!=0){
tf.setText(s1.append(String.valueOf(1/s)).toString());
//求结果
//start标记为false
//四则运算
if(flag=="+"){
if(flag=="-"){
if(flag=="*"){
if(flag=="/"){
}??
};
//添加按钮以及监听器
JButton?bks?=?new?JButton("Backspace");
bks.addActionListener(listen);
JButton?ce?=?new?JButton("CE");
ce.addActionListener(listen);
JButton?c?=?new?JButton("C");
c.addActionListener(listen);
b1.addActionListener(listen);
JButton?b10?=?new?JButton("%");
b10.addActionListener(listen);
JButton?b11?=?new?JButton("1");
b11.addActionListener(listen);
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.pack();
f.setVisible(true);
public?static?void?main(String?args[]){
//调用方法,实现计算器
new?Cal().init();
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;
public void init()
try
Container c=f.getContentPane();
JPanel pan1=new JPanel();
JButton b1=new JButton("1");
JButton b0=new JButton("0");
JButton b11=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);
b0.addActionListener(aa);
b11.addActionListener(op);
bclar.addActionListener(cl);
pan1.add(b1);
pan1.add(b11);
pan1.add(b0);
pan1.add(bclar);
catch(Exception e)
System.out.println(e.getMessage());
class A implements ActionListener
String a=text1.getText();
String s=e.getActionCommand();
if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))
text1.setText(s);
else {
text1.setText(a+s);
class Opertion implements ActionListener
cal=e.getActionCommand();
if(flag1==true)
source=text1.getText();
text1.setText(cal);
flag1=false;
flag=true;
class Result implements ActionListener
double num1;
num1=Double.parseDouble(source);
object=text1.getText();
double result=0;
if(cal.equals("+"))
if(cal.equals("-"))
if(cal.equals("*"))
if(cal.equals("/"))
text1.setText("除数不能为0");
String s1=Double.toString(result);
text1.setText(s1);
flag1=true;
class Clar implements ActionListener
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){}
import java.io.*;
public class Test implements ActionListener
Frame f = new Frame("一步运算计算器");//创建窗架
Label La1 = new Label("+");
Button btn = new Button("=");
public Test()
f.setLayout(new FlowLayout());
f.addWindowListener
(
new WindowAdapter()
public void windowClosing(WindowEvent e)
); //窗口关闭事件
btn.addActionListener //输出加法运算结果
new ActionListener()
);
tf[i].addActionListener(this); //创建文本域,注册事件监听器
tf[0].requestFocusInWindow(); //光标定位
f.add(tf[0]);
f.add(La1);
f.add(tf[1]);
f.add(btn);
f.show();
if(e.getSource()==tf[0])
a[0]=Integer.valueOf(tf[0].getText()).intValue();
tf[1].requestFocusInWindow();
if(e.getSource()==tf[1])
a[1]=Integer.valueOf(tf[1].getText()).intValue();
btn.requestFocusInWindow();
catch(Exception ex)
public static void main(String[] args) throws Exception
Test t = new Test();
在文本域中输入完后必须按Enter才能完成正确的功能.再按等号按钮输出结果.
import java.applet.*;
public class CalculatorDemo extends Applet
TextField answerText;
Button pointButton,equalButton,plusButton;
Button[] b=new Button[10];
String currentOp,preOp;
String foreText,backText;
boolean isFloat=false;
Panel p1=new Panel();
currentOp=new String("");
preOp=new String("");
foreText=new String("");
backText=new String("");
setForeground(Color.blue);
b[i]=new Button(Integer.toString(i));
pointButton=new Button(".");
equalButton=new Button("=");
equalButton.setForeground(Color.red);
clearButton=new Button("清除");
clearButton.setForeground(Color.red);
multiButton=new Button("*");
multiButton.setForeground(Color.red);
minusButton=new Button("-");
minusButton.setForeground(Color.red);
plusButton=new Button("+");
plusButton.setForeground(Color.red);
setLayout(new FlowLayout());
p1.setLayout(new FlowLayout());
p1.add(answerText);
p1.add(clearButton);
public boolean action(Event e,Object o)
String s=new String("");
for(int i=0;i10;i++)
if(e.target==b[i]||e.target==pointButton)
if(e.target !=pointButton)
s=(String)o;
doForeText(s);
if((e.target==pointButton)(!isFloat))
isFloat=true;
if(foreText.equals(""))
foreText +="0.";
if(e.target==clearButton)
doClear();
||(e.target==plusButton)||(e.target==minusButton))
if(foreText !="")
currentOp=((String)o);
doOperator();
preOp=((String)o);
if(e.target==equalButton)
public void doOperator()
double dFore,dBack;
Double d;
if(preOp.equals(""))
backText=foreText;
foreText="";
answerText.setText(backText);
dFore=(new Double(foreText)).doubleValue();
dBack=(new Double(backText)).doubleValue();
backText=answerText.getText();
if(preOp.equals("+"))
d=new Double((dBack+dFore));
answerText.setText(d.toString());
backText=d.toString();
if(preOp.equals("-"))
d=new Double((dBack-dFore));
if(preOp.equals("*"))
d=new Double((dBack*dFore));
if(preOp.equals("/"))
if(dFore==0)
answerText.setText("除数不能为0");
d=new Double((dBack/dFore));
preOp=currentOp;
public void doForeText(String s)
foreText +=s;
answerText.setText(foreText);
public void doBackText(String s)
public void doClear()
currentOp="";
preOp="";
backText="";
isFloat=false;
answerText.setText("");
以上就是土嘎嘎小编为大家整理的java图形计算器源代码相关主题介绍,如果您觉得小编更新的文章只要能对粉丝们有用,就是我们最大的鼓励和动力,不要忘记讲本站分享给您身边的朋友哦！！