import java.awt.*;
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import java.awt.event.*;
import java.lang.*;
import javax.swing.*;
public class Counter extends Frame
{
//声明三个面板的布局
GridLayout gl1,gl2,gl3;
Panel p0,p1,p2,p3;
JTextField tf1;
TextField tf2;
Button b0,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;
StringBuffer str;//显示屏所显示的字符串
double x,y;//x和y都是运算数
int z;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/"
static double m;//记忆的数字
public Counter()
{
gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局
gl2=new GridLayout(4,1,0,15);
gl3=new GridLayout(4,5,10,15);
tf1=new JTextField(27);//显示屏
tf1.setHorizontalAlignment(JTextField.RIGHT);
tf1.setEnabled(false);
tf1.setText("0");
tf2=new TextField(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=new Button("Backspace");
b0.setForeground(Color.red);
b0.addActionListener(new Bt());
b1=new Button("CE");
b1.setForeground(Color.red);
b1.addActionListener(new Bt());
b2=new Button("C");
b2.setForeground(Color.red);
b2.addActionListener(new Bt());
b3=new Button("MC");
b3.setForeground(Color.red);
b3.addActionListener(new Bt());
b4=new Button("MR");
b4.setForeground(Color.red);
b4.addActionListener(new Bt());
b5=new Button("MS");
b5.setForeground(Color.red);
b5.addActionListener(new Bt());
b6=new Button("M+");
b6.setForeground(Color.red);
b6.addActionListener(new Bt());
b7=new Button("7");
b7.setForeground(Color.blue);
b7.addActionListener(new Bt());
b8=new Button("8");
b8.setForeground(Color.blue);
b8.addActionListener(new Bt());
b9=new Button("9");
b9.setForeground(Color.blue);
b9.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());
b12=new Button("4");
b12.setForeground(Color.blue);
b12.addActionListener(new Bt());
b13=new Button("5");
b13.setForeground(Color.blue);
b13.addActionListener(new Bt());
b14=new Button("6");
b14.setForeground(Color.blue);
b14.addActionListener(new Bt());
b15=new Button("*");
b15.setForeground(Color.red);
b15.addActionListener(new Bt());
b16=new Button("%");
b16.setForeground(Color.blue);
b16.addActionListener(new Bt());
b17=new Button("1");
b17.setForeground(Color.blue);
b17.addActionListener(new Bt());
b18=new Button("2");
b18.setForeground(Color.blue);
b18.addActionListener(new Bt());
b19=new Button("3");
b19.setForeground(Color.blue);
b19.addActionListener(new Bt());
b20=new Button("-");
b20.setForeground(Color.red);
b20.addActionListener(new Bt());
b21=new Button("1/X");
b21.setForeground(Color.blue);
b21.addActionListener(new Bt());
b22=new Button("0");
b22.setForeground(Color.blue);
b22.addActionListener(new Bt());
b23=new Button("+/-");
b23.setForeground(Color.blue);
b23.addActionListener(new Bt());
b24=new Button(".");
b24.setForeground(Color.blue);
b24.addActionListener(new Bt());
b25=new Button("+");
b25.setForeground(Color.red);
b25.addActionListener(new Bt());
b26=new Button("=");
b26.setForeground(Color.red);
b26.addActionListener(new Bt());
//实例化四个面板
p0=new Panel();
p1=new Panel();
p2=new Panel();
p3=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);
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(new WindowAdapter(){
public void windowClosing(WindowEvent e1)
{
System.exit(0);
}
});
setBackground(Color.lightGray);
setBounds(100,100,320,280);
setVisible(true);
}
//构造监听器
class Bt implements ActionListener
{
public void actionPerformed(ActionEvent e2)
{
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
}
else if(e2.getSource()==b2)//选择"C"清零
{
tf1.setText("0");//把显示屏清零
str.setLength(0);
}
else if(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));
}
else if(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;
}
else if(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;
}
else if(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;
}
else if(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;
}
else if(e2.getSource()==b26)//单击等号按钮输出计算结果
{
str.setLength(0);
switch(z)
{
case 0 : tf1.setText(""+(x+y));break;
case 1 : tf1.setText(""+(x-y));break;
case 2 : tf1.setText(""+(x*y));break;
case 3 : tf1.setText(""+(x/y));break;
}
}
else if(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());
}
else if(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;
}
else if(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");
else
tf1.setText(""+Math.sqrt(x));
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b16)//单击了"%"按钮
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(0.01*x));
str.setLength(0);
y=0d;
}
else if(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;
}
else if(e2.getSource()==b3)//MC为清除内存
{
m=0d;
tf2.setText("");
str.setLength(0);
}
else if(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);
}
}
else if(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);
}
else if(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());
}
}
else if(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(NumberFormatException e){
tf1.setText("数字格式异常");
}
catch(StringIndexOutOfBoundsException e){
tf1.setText("字符串索引越界");
}
}
}
public static void main(String args[])
{
new Counter();
是用awt和swing做的，很好看比单单用AWT做好看
import java.awt.*;
import javax.swing.*;
public class Conputer extends JFrame {
protected Container con = getContentPane();// 指向内容面板
protected JMenuBar a = new JMenuBar();// 菜单条
protected JMenu a1 = new JMenu("编辑(E)");// 菜单1
protected JMenu a2 = new JMenu("查看(V)");// 菜单2
protected JMenu a3 = new JMenu("帮助(H)");// 菜单3
protected JMenuItem a11 = new JMenuItem("复制(C)", 'C');// 菜单1的菜单项
protected JMenuItem a12 = new JMenuItem("粘贴(P)", 'P');// 菜单1的菜单项
protected JMenuItem a21 = new JMenuItem("标准型(T)", 'T');// 菜单2的菜单项
protected JMenuItem a22 = new JMenuItem("科学型(S)", 'S');// 菜单2的菜单项
protected JMenuItem a31 = new JMenuItem("帮助主题(H)", 'H');// 菜单3的菜单项
protected JTextField jtf = new JTextField(30);// 文本框
protected JButton[] jb = new JButton[27];
protected String[] arr = { "Backspace", "CE", "C", "MC", "7", "8", "9", "/", "sqrt",
"MR", "4", "5", "6", "*", "%", "MS", "1", "2", "3", "-", "1/x",
"M+", "0", "+/-", ".", "+", "=" };
protected JPanel jp = new JPanel();// 主面板
protected JPanel m = new JPanel();// 次面板
protected JPanel m1 = new JPanel();// 次次面板
protected JPanel m2 = new JPanel();// 次次面板
protected JPanel m3 = new JPanel();// 次次面板
protected JPanel m4 = new JPanel();// 次次面板
protected JPanel m5 = new JPanel();// 次次面板
protected JPanel m6 = new JPanel();// 次次面板
protected GridLayout glo = new GridLayout(6, 1, 3, 3);// 主网格布局
protected GridLayout glo1 = new GridLayout(1, 3, 3, 3);// 次网格布局
protected GridLayout glo2 = new GridLayout(1, 6, 3, 3);// 次网格布局
protected Conputer(String s) {
super(s);
a1.setMnemonic('E');
a1.add(a11);
a1.add(a12);
a2.setMnemonic('V');
a2.add(a21);
a2.add(a22);
a3.setMnemonic('H');
a3.add(a31);
a.add(a1);
a.add(a2);
a.add(a3);
this.setJMenuBar(a);// 菜单条完成
for (int i = 0; i 27; i++) {
jb[i] = new JButton(arr[i]);
}
jp.setLayout(glo);
jp.add(m1);
m1.add(jtf);
jtf.setEditable(false); jtf.setText("0."); jtf.setForeground(Color.BLUE); jtf.setBackground(Color.WHITE);
jtf.setHorizontalAlignment(JTextField.RIGHT);//文本显示在右边
jp.add(m2);
m2.setLayout(glo1);
m2.add(jb[0]);
m2.add(jb[1]);
m2.add(jb[2]);
jp.add(m3);
m3.setLayout(glo2);
m3.add(jb[3]);
m3.add(jb[4]);
m3.add(jb[5]);
m3.add(jb[6]);
m3.add(jb[7]);
m3.add(jb[8]);
jp.add(m4);
m4.setLayout(glo2);
m4.add(jb[9]);
m4.add(jb[10]);
m4.add(jb[11]);
m4.add(jb[12]);
m4.add(jb[13]);
m4.add(jb[14]);
jp.add(m5);
m5.setLayout(glo2);
m5.add(jb[15]);
m5.add(jb[16]);
m5.add(jb[17]);
m5.add(jb[18]);
m5.add(jb[19]);
m5.add(jb[20]);
jp.add(m6);
m6.setLayout(glo2);
m6.add(jb[21]);
m6.add(jb[22]);
m6.add(jb[23]);
m6.add(jb[24]);
m6.add(jb[25]);
m6.add(jb[26]);
m.add(jp);
con.add(m);
this.setResizable(false);// 不能用鼠标拉伸窗体
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//可以关闭窗体
this.setSize(380, 275);
this.setVisible(true);
}
protected Conputer() {
this("计算器");
}
public static void main(String[] args) {
new Conputer("计算器");
}
}
import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.TitledBorder; //导包 public class Jisuanqi extends JFrame implements ActionListener { //继承JFrame 实现事件监听 private JTextField reasult; private JButton btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0, btnAC, btnAdd, btnSub, btnReasult, btnD, btnAbout, btnCancel; private boolean add, sub, end, s, c; private String str; private double num1, num2; public Jisuanqi() { //构造属性 JPanel p1 = new JPanel(); JPanel p2 = new JPanel(); JPanel p3 = new JPanel(); TitledBorder tb = new TitledBorder("输出"); tb.setTitleColor(Color.BLUE); //标题边框底端线 设置颜色 btnAbout = new JButton(" 关于 "); btnCancel = new JButton("Cancel"); //两个按钮 btnCancel.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { System.exit(0); } }); //给Cancel添加事件监听 当鼠标点击时 程序结束 btnAbout.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { JOptionPane.showMessageDialog(null, "黄盖！！", "消息", JOptionPane.INFORMATION_MESSAGE); } //给“关于”添加事件监听 当鼠标点击时 弹出对话框 显示黄盖 }); p3.add(btnAbout); p3.add(btnCancel); // JPanel p4=new JPanel(); // JPanel p5=new JPanel(); // reasult.setBorder(tb); reasult = new JTextField("0", 20); reasult.setEditable(false); //设置不能修改 reasult.setHorizontalAlignment(JTextField.RIGHT); // 设置文本的水平对齐方式。 reasult.setForeground(Color.BLUE); //颜色 p1.setBorder(tb); p1.add(reasult); btn0 = new JButton("0"); btn0.addActionListener(this); btn1 = new JButton("1"); btn1.addActionListener(this); btn2 = new JButton("2"); btn2.addActionListener(this); btn3 = new JButton("3"); btn3.addActionListener(this); btn4 = new JButton("4"); btn4.addActionListener(this); btn5 = new JButton("5"); btn5.addActionListener(this); btn6 = new JButton("6"); btn6.addActionListener(this); btn7 = new JButton("7"); btn7.addActionListener(this); btn8 = new JButton("8"); btn8.addActionListener(this); btn9 = new JButton("9"); btn9.addActionListener(this); btnD = new JButton("."); btnD.addActionListener(this); btnD.setForeground(Color.RED); btnAC = new JButton("AC"); btnAC.addActionListener(this); btnAC.setBackground(Color.PINK); btnAdd = new JButton("+"); btnAdd.addActionListener(this); btnAdd.setForeground(Color.BLUE); btnSub = new JButton("—"); btnSub.addActionListener(this); btnSub.setForeground(Color.BLUE); btnReasult = new JButton("="); btnReasult.addActionListener(this); btnReasult.setForeground(Color.RED); //事件监听 + 颜色 p2.add(btn1); p2.add(btn2); p2.add(btn3); p2.add(btn4); p2.add(btn5); p2.add(btn6); p2.add(btn7); p2.add(btn8); p2.add(btn9); p2.add(btn0); p2.add(btnD); p2.add(btnAC); p2.add(btnAdd); p2.add(btnSub); p2.add(btnReasult); //面板上添加按钮 p2.setLayout(new GridLayout(5, 3)); //面板上设置对齐方式 add(p1, BorderLayout.NORTH); add(p2, BorderLayout.CENTER); add(p3, BorderLayout.SOUTH); //将p1 p2 p3 面板对象添加到JFrame } public void num(int i) { String s = null; s = String.valueOf(i); if (end) { // 如果数字输入结束，则将文本框置零，重新输入 reasult.setText("0"); end = false; } if ((reasult.getText()).equals("0")) { // 如果文本框的内容为零，则覆盖文本框的内容 reasult.setText(s); } else { // 如果文本框的内容不为零，则在内容后面添加数字 str = reasult.getText() + s; reasult.setText(str); } }/* * * String s=null; * * s=String.valueOf(i); * * str=reasult.getText()+s; * * reasult.setText(str); * * } */ public void actionPerformed(ActionEvent e) { if (e.getSource() == btn1) num(1); else if (e.getSource() == btn2) num(2); else if (e.getSource() == btn3) num(3); else if (e.getSource() == btn4) num(4); else if (e.getSource() == btn5) num(5); else if (e.getSource() == btn6) num(6); else if (e.getSource() == btn7) num(7); else if (e.getSource() == btn8) num(8); else if (e.getSource() == btn9) num(9); else if (e.getSource() == btn0) num(0); else if (e.getSource() == btnAdd) { sign(1); btnD.setEnabled(true); } else if (e.getSource() == btnSub) { sign(2); btnD.setEnabled(true); } else if (e.getSource() == btnAC) { btnD.setEnabled(true); reasult.setText("0"); } else if (e.getSource() == btnD) { str = reasult.getText(); str += "."; reasult.setText(str); btnD.setEnabled(false); } else if (e.getSource() == btnReasult) { btnD.setEnabled(true); num2 = Double.parseDouble(reasult.getText()); if (add) { num1 = num1 + num2; } else if (sub) { num1 = num1 - num2; } reasult.setText(String.valueOf(num1)); end = true; } } public void sign(int s) { if (s == 1) { add = true; sub = false; } else if (s == 2) { add = false; sub = true; } num1 = Double.parseDouble(reasult.getText()); end = true; } //设计计算的过程 public static void main(String[] args) { Jisuanqi j = new Jisuanqi(); j.setTitle("+/-简易计算器"); j.setLocation(500, 280); j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //默认关闭可以关闭程序 j.setResizable(false); j.pack(); j.setVisible(true); } } 这个计算机，绝对让你满意
package com.citi.Util;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
/**
* @author yc80549
*
*/
public class Calculator extends JFrame implements ActionListener {
/**
*
*
*/
private static final long serialVersionUID = 1L;
private JTextField expression = new JTextField();
private JPanel buttonContainer = new JPanel();
private JPanel operators = new JPanel();
private JButton b1 = new JButton("1");
private JButton b2 = new JButton("2");
private JButton b3 = new JButton("3");
private JButton b4 = new JButton("4");
private JButton b5 = new JButton("5");
private JButton b6 = new JButton("6");
private JButton b7 = new JButton("7");
private JButton b8 = new JButton("8");
private JButton b9 = new JButton("9");
private JButton b0 = new JButton("0");
private JButton bpoint = new JButton(".");
private JButton bracket1 = new JButton("(");
private JButton bracket2 = new JButton(")");
private JButton plus = new JButton("+");
private JButton minus = new JButton("-");
private JButton multiply = new JButton("*");
private JButton divide = new JButton("/");
private JButton getResult = new JButton("=");
private JButton backSpace = new JButton("Backspace");
private JButton clear = new JButton("C");
private JButton OFF = new JButton("OFF");
private StringCalculate2 cacu = new StringCalculate2();
public Calculator() {
super();
setVisible(true);
this.setLayout(new BorderLayout());
this.setSize(400, 220);
Toolkit tk = Toolkit.getDefaultToolkit();
int width = (int) tk.getScreenSize().getWidth();
int height = (int) tk.getScreenSize().getHeight();
this.setLocation((int) ((width - getSize().getWidth()) / 2),
(int) ((height - getSize().getHeight()) / 2));
this.locate();
this.addAllListener();
}
public void locate() {
buttonContainer.setLayout(new GridLayout(4, 4));
buttonContainer.add(b1);
buttonContainer.add(b2);
buttonContainer.add(b3);
buttonContainer.add(plus);
buttonContainer.add(b4);
buttonContainer.add(b5);
buttonContainer.add(b6);
buttonContainer.add(minus);
buttonContainer.add(b7);
buttonContainer.add(b8);
buttonContainer.add(b9);
buttonContainer.add(multiply);
buttonContainer.add(b0);
buttonContainer.add(bpoint);
buttonContainer.add(getResult);
buttonContainer.add(divide);
operators.add(bracket1);
operators.add(bracket2);
operators.add(backSpace);
operators.add(clear);
operators.add(OFF);
this.add(expression, BorderLayout.NORTH);
this.add(buttonContainer, BorderLayout.CENTER);
this.add(operators, BorderLayout.SOUTH);
}
public void addAllListener() {
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
b0.addActionListener(this);
plus.addActionListener(this);
multiply.addActionListener(this);
divide.addActionListener(this);
minus.addActionListener(this);
bpoint.addActionListener(this);
bracket1.addActionListener(this);
bracket2.addActionListener(this);
getResult.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
double result = cacu.parse(expression.getText());
expression.setText("" + result);
} catch (Exception e1) {
System.err
.println("invaild expression or RuntimeException");
}
}
});
clear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
expression.setText("");
}
});
OFF.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(1);
}
});
backSpace.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
expression.setText(expression.getText().substring(0,
expression.getText().length() - 1));
}
});
}
public void actionPerformed(ActionEvent e) {
JButton source = (JButton) e.getSource();
expression.setText(expression.getText() + source.getText());
}
public static void main(String[] args) {
Calculator cal = new Calculator();
cal.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
package com.citi.Util;
import java.util.Stack;
import javax.swing.JOptionPane;
public class StringCalculate2 {
private StackDouble numbers = new StackDouble();
private StackCharacter chs = new StackCharacter();
private boolean compare(char str) {
if (chs.empty()) {
return true;
}
char last = (char) chs.lastElement();
switch (str) {
case '*': {
if (last == '+' || last == '-')
return true;
else
return false;
}
case '/': {
if (last == '+' || last == '-')
return true;
else
return false;
}
case '+':
return false;
case '-':
return false;
}
return true;
}
public Double caculate(String str) {
StringBuffer sb = new StringBuffer(str);
StringBuffer num = new StringBuffer();
String tem = null;
char next;
while (sb.length() 0) {
tem = sb.substring(0, 1);
sb.delete(0, 1);
if (isNum(tem.trim())) {
num.append(tem);
} else {
if (num.length() 0 !"".equals(num.toString().trim())) {
Double d = new Double(num.toString().trim());
numbers.push(d);
num.delete(0, num.length());
}
if (!chs.isEmpty()) {
while (!compare(tem.charAt(0))) {
caculate();
}
}
if (numbers.isEmpty()) {
num.append(tem);
} else {
chs.push(new Character(tem.charAt(0)));
}
next = sb.charAt(0);
if (next == '-') {
num.append(next);
sb.delete(0, 1);
}
}
}
Double d = new Double(num.toString().trim());
numbers.push(d);
while (!chs.isEmpty()) {
caculate();
}
return numbers.pop();
}
public void caculate() {
Double b = numbers.pop();
Double a = null;
a = numbers.pop();
char ope = chs.pop();
Double result = null;
switch (ope) {
case '+':
result = a + b;
numbers.push(result);
break;
case '-':
result = a - b;
numbers.push(result);
break;
case '*':
result = a * b;
numbers.push(result);
break;
case '/':
result = a / b;
numbers.push(result);
break;
}
}
private boolean isNum(String num) {
return num.matches("[0-9.]");
}
public Double parse(String str) {
int start = 0;
StringBuffer sts = new StringBuffer(str);
int end = -1;
while ((end = sts.indexOf(")")) 0) {
String s = sts.substring(start, end + 1);
int first = s.lastIndexOf("(");
Double value = caculate(sts.substring(first + 1, end));
sts.replace(first, end + 1, value.toString());
}
return caculate(sts.toString());
}
public static void main(String[] args) {
String exp = JOptionPane
.showInputDialog("please input expression you want to caculate!");
if (exp.trim().equals("")) {
System.out.println("you have input nothing");
return;
}
StringCalculate2 sc = new StringCalculate2();
JOptionPane.showMessageDialog(null, "the result is: " + sc.parse(exp));
}
}
package jisuanqi_new;
import java.awt.*;
import java.awt.event.*;
public class JiSuanQi_new implements ActionListener
{
Panel p1;//声明面板p1
TextField t1;//声明文本行t1
String[] label = {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};//声明标签数组label1存放按钮上的标签
Button[] b;//声明按钮数组存放16个按钮
private int i;//声明i以备后用
private String op1 = "0";//运算数备用
private String operator = "+";//运算符备用
private boolean append = false;//备用
public JiSuanQi_new()//构造方法
{
t1=new TextField();//初始化文本行t1
b = new Button[label.length];//初始化按钮数组b
p1=new Panel();//初始化面板p1
p1.setLayout(new GridLayout(4,4,4,4));//使面板选择网格布局管理器以备储存16个按钮（4行4列）
for(int i=0;ib.length;i++)//利用for循环把标签放在按钮上，使每个按钮添加事件监听器，在面板p1上添加上16个按钮
{
b[i] = new Button(label[i]);//把标签依次放在16个按钮上
b[i].addActionListener(this);//使每个按钮添加动作事件监听器
p1.add(b[i]); //分别将按钮添加到面板p1上
}
Frame f=new Frame("计算器1.0");//初始化窗口f,起名字计算器1.0
f.setLayout(new BorderLayout());//为窗口选择边界布局管理器
f.add(BorderLayout.NORTH,t1);//把文本行他添加到窗口的北部
f.add(BorderLayout.CENTER,p1);//把面吧p1添加到窗口的中间
f.addWindowListener(new WindowAdapter(){//给窗口f添加窗口事件监听器
public void windowClosing(WindowEvent eve){//运行窗口关闭方法
System.exit(0);//退出程序
}
});
f.setSize(250, 250);//设置窗口大小
f.setLocation(200,200);
f.setVisible(true);//显示窗口
}
public static void main(String args[])
{
new JiSuanQi_new(); //调用构造方法
}
public void actionPerformed(ActionEvent ae)
{//按钮被操作发生
String comm = ae.getActionCommand();//返回与此动作相关的命令字符串，即：使用者第一次点击的按钮是什么。
if("0123456789".indexOf(comm)!=-1)//如果相关命令字符串为0~9之间的数字则执行
{
if(append){
String temp = t1.getText();//新数字
t1.setText(temp+comm);
}else{ //因为此时append为false执行这个
t1.setText(comm); //将文本行t1设置为相关命令字符串（你按中的按钮代码）
append = true;//此时append=true若继续按按钮若继续按数字的话1.第一次的按话不会改变2.非第一次按得话会覆盖之前按得数字（即缺点：只能进行单个数字的计算）
}
}
else if(("+-*/".indexOf(comm)!=-1))//如果相关命令字符串为+-*/之间的数字则执行
{
//保存
//t1.setText(comm);
op1 = t1.getText();//把第一个数赋值给op1
operator = comm;//把命令字符串赋值给operator
append = false;//此时append为false即若继续按按钮若按数字的话将重复上面的动作，按符号的话将覆盖之前的符号
}
else if("=".equals(comm))//如果按的是=号，则按条件进行下面的运算
{
String op2 = t1.getText();//op2第二个数
double d1 = Double.parseDouble(op1);
double d2 = Double.parseDouble(op2);
if(operator.equals("+")){
d1 = d1 + d2 ;
}else if(operator.equals("-")){
d1 = d1 - d2;
}else if(operator.equals("*")){
d1 = d1 * d2;
}else {
d1 = d1 / d2;
}
t1.setText(d1+"");//显示计算结果
append = false;
}
else if(".".equals(comm))//若是.号继续按
{
String temp = t1.getText();
if(temp.indexOf(".")==-1){
t1.setText(temp+".");
append = true;
}
}
}
}
我给你找找
package com.bj.calcultor;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calcultor extends Frame implements ActionListener {
public static void main(String[] args) {//定义主方
new Calcultor();//创建匿名对象，并调用test()方法;
}
//定义按钮名称
String[] arr={"1","2","3","4","5","6","7","8","9","0","+","-","*","/","=","."};
JButton [] button=new JButton[arr.length];
JButton reset = new JButton("CE");
JTextField display = new JTextField(20);
//创建窗口，定义组件
//执行窗口事件:关闭窗口
private class WindowCloser extends WindowAdapter {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
}
public Calcultor(){
super("计算器");//定义标题
//定义面板容器，并布局
JPanel jpanel=new JPanel(new GridLayout(4,4));
//添加按钮，并给按钮添加名称
for (int i = 0; i arr.length; i++) {
button[i]= new JButton(arr[i]);
jpanel.add(button[i]);
}
JPanel panel2 = new JPanel();
panel2.add("Northr", display);
display.setEnabled(false);
panel2.add("East", reset);
this.add("North", panel2);
this.add("Center", jpanel);
for (int i = 0; i arr.length; i++){
addWindowListener(new WindowCloser());
setVisible(true);
setSize(400,400);
pack();
button[i].addActionListener(this);
reset.addActionListener(this);
display.addActionListener(this);
}
}
@Override
public void actionPerformed(ActionEvent e) {//定义事件
// TODO Auto-generated method stub
Object target=e.getSource();
String lable=e.getActionCommand();
if(target==reset){
handleReset();
}else if("0123456789.".indexOf(lable)0){
handleNumber(lable);
}else{
hadleOperator(lable);
}
}
boolean isFirstDigit=true;
private void hadleOperator(String key) {
if(operator.equals("+")){
number += Double.valueOf(display.getText());
}else if (operator.equals("-")){
number -= Double.valueOf(display.getText());
}else if (operator.equals("*")){
number *= Double.valueOf(display.getText());
}else if (operator.equals("/")){
number /= Double.valueOf(display.getText());
}else if(operator.equals("=")){
number =Double.valueOf(display.getText());
}
display.setText(String.valueOf(number));
operator=key;
isFirstDigit=true;
}
private void handleNumber(String key) {
if(true){
display.setText(key);//把键值设置为文本框内容
}else if(key.equals(".") display.getText().indexOf(".")0){
display.setText(display.getText()+".");//把文本框内容设置：display.getText()+"."
}else if(!key.equals(".")){
display.setText(display.getText() + key);//把文本框内容设置：display.getText()+key
isFirstDigit=false;
}
}
private void handleReset() {
display.setText("0");
isFirstDigit=true;
operator="=";
}
String operator="=";
Double number=0.0;
}
