请各位帮帮忙看看自己编写的一个计算器的JAVA小程序
package whh;
import java.awt.*;
import java.awt.event.*;
class EventTest extends Frame implements ActionListener,ItemListener
{
Button btn1[]=new Button[16];
Button btn2[]=new Button[16];
TextField text;
String a1="",a2="",b1="",b2="",b3="",x;
CheckboxGroup cbg=new CheckboxGroup();
Checkbox c1,c2,c3;
EventTest()
{
setTitle("计算器");
setLayout(null);
setSize(500,250);
setLocation(400,200);
this.setResizable(false);
text=new TextField("0",6);
text.setEditable(false);
Panel pnl=new Panel(new GridLayout(4,4,7,7));
Panel pnl2=new Panel(new GridLayout(1,4,7,7));
Panel pnl3=new Panel(new GridLayout(1,4,7,7));
Panel pnl4=new Panel(new GridLayout(1,4,7,7));
Panel pnl5=new Panel(new GridLayout(1,4,7,7));
Panel pnl6=new Panel(new GridLayout(4,4,7,7));
for(int i=0;i<=9;i++)
{
btn1[i]=new Button(String.valueOf(i));
}
btn1[10]=new Button("+");
btn1[10].setForeground(Color.red);
btn1[11]=new Button("-");
btn1[11].setForeground(Color.red);
btn1[12]=new Button("*");
btn1[12].setForeground(Color.red);
btn1[13]=new Button("/");
btn1[13].setForeground(Color.red);
btn1[14]=new Button("C");
btn1[14].setForeground(Color.red);
btn1[15]=new Button("=");
btn1[15].setForeground(Color.red);
btn2[0]=new Button("Sin");
btn2[1]=new Button("And");
btn2[2]=new Button("(");
btn2[3]=new Button(")");
btn2[4]=new Button("Cos");
btn2[5]=new Button("Or");
btn2[6]=new Button("Exp");
btn2[7]=new Button("Ln");
btn2[8]=new Button("Tan");
btn2[9]=new Button("Xo");
btn2[10]=new Button("x*y");
btn2[11]=new Button("Log");
btn2[12]=new Button("e");
btn2[13]=new Button("Not");
btn2[14]=new Button("x*3");
btn2[15]=new Button("n!");
for(int i=0;i<=15;i++)
{
btn2[i].disable();
}
c1=new Checkbox("十进制",cbg,true);
c2=new Checkbox("八进制",cbg,false);
c3=new Checkbox("二进制",cbg,false);
this.setLayout(null);
pnl.setBounds(260,90,240,160);
pnl2.setBounds(0, 70, 240, 20);
pnl3.setBounds(260, 70, 240, 20);
pnl4.setBounds(0, 30, 500, 20);
pnl5.setBounds(50, 50, 400, 20);
pnl6.setBounds(0,90,240,160);
for (int i=0;i<=15;i++)
{
pnl.add(btn1[i]);
}
pnl2.add(c1);
pnl2.add(c2);
pnl2.add(c3);
pnl3.add(new Checkbox("Inv"));
pnl3.add(new Checkbox("Hyp"));
pnl5.add(text);
for(int i=0;i<=15;i++)
{
pnl6.add(btn2[i]);
}
this.add(pnl);
this.add(pnl2);
this.add(pnl3);
this.add(pnl4);
this.add(pnl5);
this.add(pnl6);
for(int i=0;i<=15;i++)
{
btn1[i].addActionListener(this);// 注册监听器
}
c1.addItemListener(this);
c2.addItemListener(this);
c3.addItemListener(this);
//关闭窗口
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setVisible(true);
}
public void itemStateChanged(ItemEvent e)
{
if(c1.getState()==true)
{
for(int i=0;i<=9;i++)
{
btn1[i].enable();
}
}
if(c2.getState()==true)
{
btn1[8].disable();
btn1[9].disable();
}
if(c3.getState()==true)
{
for(int i=2;i<=9;i++)
{
btn1[i].disable();
}
}
}
public void actionPerformed(ActionEvent e)
{
//取得事件源对象
Button btn=(Button) e.getSource();
if(btn==btn1[0]) // 如果是按下btn1按钮
{
a1=btn1[0].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[1])
{
a1=btn1[1].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[2])
{
a1=btn1[2].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[3])
{
a1=btn1[3].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[4])
{
a1=btn1[4].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[5])
{
a1=btn1[5].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[6])
{
a1=btn1[6].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[7])
{
a1=btn1[7].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[8])
{
a1=btn1[8].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[9])
{
a1=btn1[9].getLabel();
b1=b1+a1;
text.setText(b1);
}
if(btn==btn1[10])
{
b3=text.getText();
b1="";
x=btn1[10].getLabel();
}
if(btn==btn1[11])
{
b3=text.getText();
b1="";
x=btn1[11].getLabel();
}
if(btn==btn1[12])
{
b3=text.getText();
b1="";
x=btn1[12].getLabel();
}
if(btn==btn1[13])
{
b3=text.getText();
b1="";
x=btn1[13].getLabel();
}
if(btn==btn1[14])
{
b1="";
text.setText("0");
}
if(btn==btn1[15])
{
b2=text.getText();
b1="";
if(x=="+")
{
float c = Float.parseFloat(b3)+ Float.parseFloat(b2);
text.setText(String.valueOf(c));
}
if(x=="-")
{
float c = Float.parseFloat(b3)- Float.parseFloat(b2);
text.setText(String.valueOf(c));
}
if(x=="*")
{
float c = Float.parseFloat(b3)* Float.parseFloat(b2);
text.setText(String.valueOf(c));
}
if(x=="/")
{
float c = Float.parseFloat(b3)/Float.parseFloat(b2);
text.setText(String.valueOf(c));
}
}
}
public static void main(String args[])
{
EventTest frm=new EventTest();
}
}
代码如上 就是我再按一下“=”这个按钮的时候 的出的结果不对 其他运算也一样只能运算一次不能再一次运算以后 连续按等号
帮帮修改一下
或者 有什么算法说一下 最好详细一点
谢谢了
还有 什么不好的地方请指出
不胜感激涕零啊
[解决办法]
没有什么问题啊..不知道是不是我理解错了.
比如2+3 按第一次"=" 时结果为"5",再接着
按"="结果依次为:7,9,11,13,15....
这没有什么不对啊.就是平时用的计算器也是这样的了.
就连微软自带的计算器也是这样.
只是有点不同,如:2+3=5,再按"="时.依次为:5,8,11,14...
交换了一个而矣.
[解决办法]
我给你一个你自己看看好吗？
public class Calculator{
private String result = "0";
private int op = 0,add = 1,sub = 2,mul = 3,div = 4;
private double stringToDouble(String x){
double y = Double.parseDouble(x);
return y;
}
private void operate(String x){
double x1 = stringToDouble(x);
double y = stringToDouble(result);
switch (op){
case 0:
result = x;
break;
case 1:
result = String.valueOf(y+x1);
break;
case 2:
result = String.valueOf(y-x1);
break;
case 3:
result = String.valueOf(y*x1);
break;
case 4:
if(x1!=0){
result = String.valueOf(y/x1);
}else{
result = "The divisor can't be zero!";
}
break;
}
}
public String opAdd(String x){
operate(x);
op = add;
return result;
}
public String opSubtract(String x){
operate(x);
op = sub;
return result;
}
public String opMultiply(String x){
operate(x);
op = mul;
return result;
}
public String opDivide(String x){
operate(x);
op = div;
return result;
}
public String opEquals(String x){
operate(x);
op = 0;
return result;
}
public void opClean(){
op = 0;
result = "0";
}
}
//////////CalculatorGUI///////////////////////
import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;
public class CalculatorGUI{
private Frame f;
private Panel p1,p2;
private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;
private TextField tf;
private String s,op;
private Calculator cal = new Calculator();
private boolean ifOp;
public CalculatorGUI(){
f = new Frame("Calculator");
p1 = new Panel();
p2 = new Panel();
b0 = new Button("0");
b1 = new Button("1");
b2 = new Button("2");
b3 = new Button("3");
b4 = new Button("4");
b5 = new Button("5");
b6 = new Button("6");
b7 = new Button("7");
b8 = new Button("8");
b9 = new Button("9");
bPoint = new Button(".");
bAdd = new Button("+");
bDec = new Button("-");
bMul = new Button("*");
bDiv = new Button("/");
bCal = new Button("=");
tf = new TextField(25);
tf.setEditable(false);
}
public void launchFrame(){
f.setSize(220,160);
f.setResizable(false);
f.addWindowListener(new myWindowListener());
p1.setLayout(new FlowLayout(FlowLayout.CENTER));
p1.add(tf);
f.add(p1,BorderLayout.NORTH);
p2.setLayout(new GridLayout(4,4));
b0.addActionListener(new setLabelText_ActionListener());
b1.addActionListener(new setLabelText_ActionListener());
b2.addActionListener(new setLabelText_ActionListener());
b3.addActionListener(new setLabelText_ActionListener());
b4.addActionListener(new setLabelText_ActionListener());
b5.addActionListener(new setLabelText_ActionListener());
b6.addActionListener(new setLabelText_ActionListener());
b7.addActionListener(new setLabelText_ActionListener());
b8.addActionListener(new setLabelText_ActionListener());
b9.addActionListener(new setLabelText_ActionListener());
bPoint.addActionListener(new setLabelText_ActionListener());
bAdd.addActionListener(new setOperator_ActionListener());
bDec.addActionListener(new setOperator_ActionListener());
bMul.addActionListener(new setOperator_ActionListener());
bDiv.addActionListener(new setOperator_ActionListener());
bCal.addActionListener(new setOperator_ActionListener());
p2.add(b7);
p2.add(b8);
p2.add(b9);
p2.add(bAdd);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.add(bDec);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(bMul);
p2.add(b0);
p2.add(bPoint);
p2.add(bCal);
p2.add(bDiv);
f.add(p2,BorderLayout.SOUTH);
f.setVisible(true);
}
public void setTextFieldText_Temp(){
if (tf.getText().length()<15 && (tf.getText().indexOf(".")==-1 || !s.equals("."))){
tf.setText(tf.getText()+s);
}else{
tf.setText((tf.getText()+s).substring(0,15));
}
}
public void setTextFieldText(){
if(ifOp){
ifOp = false;
tf.setText("");
setTextFieldText_Temp();
}else{
setTextFieldText_Temp();
}
}
public static void main(String[] args){
CalculatorGUI calculator = new CalculatorGUI();
calculator.launchFrame();
}
class myWindowListener extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
class setLabelText_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
s = tempB.getLabel();
setTextFieldText();
}
}
class setOperator_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
op = tempB.getLabel();
if(op.equals("+")){
tf.setText(cal.opAdd(tf.getText()));
ifOp = true;
}else if(op.equals("-")){
tf.setText(cal.opSubtract(tf.getText()));
ifOp = true;
}else if(op.equals("*")){
tf.setText(cal.opMultiply(tf.getText()));
ifOp = true;
}else if(op.equals("/")){
tf.setText(cal.opDivide(tf.getText()));
ifOp = true;
}else if(op.equals("=")){
tf.setText(cal.opEquals(tf.getText()));
ifOp = true;
}
}
}
}
我自己从前搞的，基本上的是O(n)
[解决办法]
对不起，发错了
if(btn==btn1[15])
{
b2=text.getText();
b1="";
if(x=="+")
{
double c = Double.parseDouble(b3)+ Double.parseDouble(b2);
text.setText(String.valueOf(c));
}
if(x=="-")
{
double c = Double.parseDouble(b3)-Double.parseDouble(b2);
text.setText(String.valueOf(c));
}
if(x=="*")
{
double c = Double.parseDouble(b3)*Double.parseDouble(b2);
text.setText(String.valueOf(c));
}
if(x=="/")
{
double c = Double.parseDouble(b3)/Double.parseDouble(b2);
text.setText(String.valueOf(c));
}
if(x=="=")
{
text.setText(b2);
}
x=btn1[15].getLabel();
}
