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849天前111111111111111111111111111111111111111111111111111111111111111111111 |
import java.awt.BorderLayout; |
import java.awt.Button; |
import java.awt.Color; |
import java.awt.Font; |
import java.awt.Frame; |
import java.awt.GridLayout; |
import java.awt.Panel; |
import java.awt.event.ActionEvent; |
import java.awt.event.ActionListener; |
import java.awt.event.WindowAdapter; |
import java.awt.event.WindowEvent; |
import java.awt.event.WindowListener; |
import java.rmi.server.Operation; |
import java.text.NumberFormat; |
import java.util.LinkedList; |
import javax.naming.LinkLoopException; |
import javax.swing.JButton; |
import javax.swing.JFrame; |
import javax.swing.JPanel; |
import javax.swing.JTextField; |
import javax.swing.border.BevelBorder; |
import javax.swing.border.SoftBevelBorder; |
public class ComputerPad extends Frame implements ActionListener{ |
NumberButton numberButton[]; //数字按钮数组 |
OperationButton operationButton[]; //运算符号按钮数组 |
JTextField resultShow; |
//小数点按钮，正负号按钮，退格按钮，求倒数按钮，等号按钮，清零按钮 |
JButton btn_point,btn_symbol,btn_quit,btn_lastCount,btn_equal,btn_clear; //按钮 |
LinkedList linkedList =new LinkedList();//负责存储数据的对象 |
String operation[]={"+","-","*","/"};//运算发号数组 |
boolean flag=false; //是否按下等号 |
public void f(){ |
JFrame frame=new JFrame("计算器"); |
frame.setBounds(200,100,320,250); |
JPanel panel=new JPanel(); |
JPanel panel1=new JPanel(); |
numberButton=new NumberButton[10];//共有十个数字按钮 |
for (int i = 0; i < 10 ;i++) { |
numberButton[i]=new NumberButton(i); |
numberButton[i].addActionListener(this); |
} |
operationButton =new OperationButton[4]; |
for (int i = 0; i <4; i++) { |
operationButton[i]=new OperationButton(operation[i]); |
operationButton[i].addActionListener( this); |
} |
btn_point=new JButton(".");//小数点 |
btn_symbol=new JButton("+/-");//正负号 |
btn_equal=new JButton("=");//等号 |
btn_quit=new JButton("退格");//退格 |
btn_lastCount=new JButton("1/x");//倒数 |
btn_clear=new JButton("c");//清空 |
btn_clear.setForeground(Color.red); |
btn_quit.setForeground(Color.red); |
btn_equal.setForeground(Color.red); |
btn_lastCount.setForeground(Color.blue); |
btn_symbol.setForeground(Color.blue); |
btn_point.setForeground(Color.blue); |
|
btn_clear.addActionListener(this); |
btn_equal.addActionListener(this); |
btn_lastCount.addActionListener(this); |
btn_point.addActionListener(this); |
btn_quit.addActionListener(this); |
btn_symbol.addActionListener(this); |
|
resultShow=new JTextField(20); |
resultShow.setHorizontalAlignment(JTextField.RIGHT); |
resultShow.setForeground(Color.blue); |
resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14)); |
resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED)); |
resultShow.setBackground(Color.white); |
resultShow.setEditable(false); |
|
panel1.add(resultShow); |
panel.setLayout(new GridLayout(4,5));//面板中的第一行 |
panel.add(numberButton[1]); |
panel.add(numberButton[2]); |
panel.add(numberButton[3]); |
panel.add(operationButton[0]); |
panel.add(btn_clear); |
//面板第二行 |
panel.add(numberButton[4]); |
panel.add(numberButton[5]); |
panel.add(numberButton[6]); |
panel.add(operationButton[1]); |
panel.add(btn_quit); |
//面板中的第三行 |
panel.add(numberButton[7]); |
panel.add(numberButton[8]); |
panel.add(numberButton[9]); |
panel.add(operationButton[2]); |
panel.add(btn_lastCount); |
//面板中的第四行 |
panel.add(numberButton[0]); |
panel.add(btn_symbol); |
panel.add(btn_point); |
panel.add(operationButton[3]); |
panel.add(btn_equal); |
|
frame.add(panel1, BorderLayout.NORTH); |
frame.add(panel,BorderLayout.CENTER); |
|
addWindowListener(new WindowAdapter() { |
@Override |
public void windowClosing(WindowEvent e) { |
System.exit(0); |
} |
}); |
frame.setVisible(true); |
setResizable(false); |
validate(); |
} |
@Override |
public void actionPerformed(ActionEvent e) { |
// TODO Auto-generated method stub |
if(e.getSource() instanceof NumberButton)//如果数遍单击数字按钮 |
{ |
NumberButton b=(NumberButton) e.getSource(); |
if (linkedList.size()==0) {//如果链表中没有节点 |
int number=b.getNumber();//获取按钮上的数字 |
linkedList.add(""+number);//将数据添加到链表 |
resultShow.setText(""+number);//将两个数字收尾相接 |
flag=false; |
} |
else if(linkedList.size()==1&&flag==false){ |
int number=b.getNumber(); |
String num=(String) linkedList.getFirst(); |
String s=num.concat(""+number); |
linkedList.set(0, s); |
resultShow.setText(s); |
} |
else if(linkedList.size()==1&&flag==true){ |
int number=b.getNumber(); |
linkedList.removeFirst(); |
linkedList.add(""+number); //将数据添加到链表 |
flag=false; |
resultShow.setText(""+number); |
} |
else if(linkedList.size()==2){//链表中已有2个节点 |
int number=b.getNumber();//获取按钮上数字 |
linkedList.add(""+number);//链表添加第三个节点，注意：第二个节点是运算符号。 |
resultShow.setText(""+number); |
} |
else if(linkedList.size()==3){//链表中已有3个节点 |
int number=b.getNumber(); |
String num=(String) linkedList.getLast(); |
String s=num.concat(""+number);//与链表第3个节点中的数字收尾相接 |
linkedList.set(2, s); |
resultShow.setText(s); |
} |
} |
|
else if(e.getSource() instanceof OperationButton){//如果单击运算符号按钮 |
OperationButton b=(OperationButton) e.getSource(); |
if(linkedList.size()==1){ |
String fuhao=b.getOperator(); |
linkedList.add(fuhao); |
} |
else if(linkedList.size()==2){ |
String fuhao=b.getOperator(); |
linkedList.set(1, fuhao); |
} |
else if(linkedList.size()==3){ |
String fuhao=b.getOperator(); |
String number1=(String) linkedList.getFirst(); |
String number2=(String) linkedList.getLast(); |
String yunsuanfuhao=(String) linkedList.get(1); |
try { |
double n1=Double.parseDouble(number1); |
double n2=Double.parseDouble(number2); |
double n=0; |
if(yunsuanfuhao.equals("+")){ |
n=n1+n2; |
} |
else if(yunsuanfuhao.equals("-")){ |
n=n1-n2; |
} |
else if(yunsuanfuhao.equals("*")){ |
n=n1*n2; |
} |
else if(yunsuanfuhao.equals("/")){ |
n=n1/n2; |
} |
linkedList.clear();//根据链表内已有的数进行运算，其结果作为新的运算数值 |
linkedList.add(""+n); |
linkedList.add(fuhao); |
resultShow.setText(""+n); |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
} |
//(1) |
else if(e.getSource()==btn_equal){ |
flag=true; |
if(linkedList.size()==1||linkedList.size()==2){ |
String num=(String) linkedList.getFirst(); |
resultShow.setText(""+num); |
} |
else if(linkedList.size()==3){ |
String number1=(String) linkedList.getFirst(); |
String number2=(String) linkedList.getLast(); |
String yunsuanfuhao=(String) linkedList.get(1); |
try { |
double n1=Double.parseDouble(number1); |
double n2=Double.parseDouble(number2); |
double n=0; |
if(yunsuanfuhao.equals("+")){ |
n=n1+n2; |
} |
else if(yunsuanfuhao.equals("-")){ |
n=n1-n2; |
} |
else if(yunsuanfuhao.equals("*")){ |
n=n1*n2; |
} |
else if(yunsuanfuhao.equals("/")){ |
n=n1/n2; |
} |
resultShow.setText(""+n); |
linkedList.set(0,""+n); |
linkedList.removeLast();//将链表中的第二个运算数删除 |
linkedList.removeLast();//再将运算符号删除 |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
} |
//(2) |
else if(e.getSource()==btn_point){ |
if(linkedList.size()==0){ |
flag=false; |
} |
else if(linkedList.size()==1) { |
String dot=btn_point.getLabel();//获取按钮上的小数点 |
String num=(String) linkedList.getFirst(); |
String s=null; |
if(num.indexOf(dot)==-1){//嫁娶数字中不含小数点 |
s=num.concat(dot); |
linkedList.set(0, s); |
} |
else{ |
s=num; |
} |
linkedList.set(0, s); |
resultShow.setText(s); |
} |
else if(linkedList.size()==3){ |
String dot=btn_point.getLabel();//获取按钮上的小数点 |
String num=(String) linkedList.getLast(); |
String s=null; |
if(num.indexOf(dot)==-1){ |
s=num.concat(dot); |
linkedList.set(2, s); |
} |
else{ |
s=num; |
} |
resultShow.setText(s); |
} |
} |
//(3) |
else if(e.getSource()==btn_quit){ |
if(linkedList.size()==1){ |
String num=(String) linkedList.getFirst(); |
if(num.length()>=1){ |
num=num.substring(0,num.length()-1); |
linkedList.set(0, num); |
resultShow.setText(num); |
}else{ |
linkedList.removeLast(); |
resultShow.setText("0"); |
} |
} |
else if(linkedList.size()==3){ |
String num=(String) linkedList.getLast(); |
if(num.length()>=1){ |
num=num.substring(0, num.length()-1); |
linkedList.set(2, num); |
} |
else{ |
linkedList.removeLast(); |
resultShow.setText("0"); |
} |
} |
} |
//(4) |
else if(e.getSource()==btn_symbol){ |
if(linkedList.size()==1){ |
String number1=(String) linkedList.getFirst(); |
try { |
double d=Double.parseDouble(number1); |
d=-1*d; |
String str=String.valueOf(d); |
linkedList.set(0, str); |
resultShow.setText(str); |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
else if(linkedList.size()==3){ |
String number2=(String) linkedList.getLast(); |
try { |
double d=(Double) linkedList.getLast(); |
d=-1*d; |
String str=String.valueOf(d); |
linkedList.set(2, str); |
resultShow.setText(str); |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
} |
//(5) |
else if(e.getSource()==btn_lastCount){ |
if(linkedList.size()==1||linkedList.size()==2){ |
String number1=(String) linkedList.getFirst(); |
try { |
double d=Double.parseDouble(number1); |
d=1.0/d; |
String str=String.valueOf(d); |
linkedList.set(0, str); |
resultShow.setText(str); |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
else if(linkedList.size()==3){ |
String number2=(String) linkedList.getLast(); |
try { |
double d=Double.parseDouble(number2); |
d=1.0/d; |
String str=String.valueOf(d); |
linkedList.set(0, str); |
} catch (Exception e2) { |
// TODO: handle exception |
} |
} |
} |
//(6) |
else if(e.getSource()==btn_clear){ |
flag=false; |
resultShow.setText("0"); |
linkedList.clear(); |
} |
} |
public static void main(String[] args) { |
ComputerPad c=new ComputerPad(); |
c.f(); |
|
} |
} |
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import java.awt.Button; |
import java.awt.Color; |
import java.awt.GraphicsEnvironment; |
import java.awt.HeadlessException; |
public class NumberButton extends Button{ |
int number; |
public NumberButton(int number) { |
super(" "+number);// public Button(String label) throws HeadlessException { GraphicsEnvironment.checkHeadless();this.label = label; } 构造一个带指定标签的按钮。 |
this.number=number; |
setForeground(Color.blue); |
} |
public int getNumber() { |
return number; |
} |
} |
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import java.awt.Button; |
import java.awt.Color; |
public class OperationButton extends Button{ |
String operator; |
public OperationButton(String s){ |
super(s); |
operator=s; |
setForeground(Color.red); |
} |
public String getOperator(){ |
return operator; |
} |
} |
by: 发表于：2017-06-21 17:22:43 顶(0) | 踩(0) 回复
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