高手请进，java遇难，多谢请求
计算器小程序
import javax。swing。*;
import java。awt。Container;
import java。awt。event。*;
public class Calculate_GUI extends JFrame{
private JPanel p1;
private JButton keyButton[]=new JButton[16],signButton,clearButton,deleteButton;
private JTextField outputField;
private Container contentPane;
private boo...全部
计算器小程序
import javax。swing。*;
import java。awt。Container;
import java。awt。event。*;
public class Calculate_GUI extends JFrame{
private JPanel p1;
private JButton keyButton[]=new JButton[16],signButton,clearButton,deleteButton;
private JTextField outputField;
private Container contentPane;
private boolean firstInput=true;
private Calculate_Model model=new Calculate_Model();
public Calculate_GUI(){
p1=new JPanel();
keyButton[0]=new JButton("1");
keyButton[1]=new JButton("2");
keyButton[2]=new JButton("3");
keyButton[3]=new JButton("/");
keyButton[4]=new JButton("4");
keyButton[5]=new JButton("5");
keyButton[6]=new JButton("6");
keyButton[7]=new JButton("*");
keyButton[8]=new JButton("7");
keyButton[9]=new JButton("8");
keyButton[10]=new JButton("9");
keyButton[11]=new JButton("-");
keyButton[12]=new JButton("0");
keyButton[13]=new JButton("。
");
keyButton[14]=new JButton("=");
keyButton[15]=new JButton("+");
clearButton=new JButton("c");
signButton=new JButton("+/-");
deleteButton=new JButton("←");
outputField=new JTextField(15);
outputField。
setText("0");
outputField。setEditable(false);
contentPane=this。getContentPane();
this。setSize(250,250);
p1。
setLayout(new java。awt。GridLayout(4,5));
for(int i=0;i add(clearButton);
if(i==12)p1。add(signButton);
keyButton[i]。setFont(new java。awt。Font("Dialog",1,16));
p1。
add(keyButton[i]);
}
contentPane。add(outputField,java。awt。BorderLayout。NORTH);
contentPane。
add(p1,java。awt。BorderLayout。CENTER);
this。show();
}
public void registEvent(){
this。addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){System。
exit(0);}
});
for(int i=0;i addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
outputField。
setText(String。valueOf(model。toSign(Double。parseDouble(outputField。getText()))));
}
});
deleteButton。
addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
outputField。
setText(model。backSpace(outputField。getText()));
if(outputField。getText()。equals("0"))firstInput=true;
}
});
clearButton。
addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
firstInput=true;
outputField。
setText("0");
model。reset();
}
});
}
class keyButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent ae){
char actionCommand=ae。
getActionCommand()。charAt(0);
switch(actionCommand){
case '1':case '2':case '3':case '4':case '5': case '6':case '7':case '8':case '9':case '0':case '。
':
if(firstInput){outputField。setText(String。valueOf(actionCommand));firstInput=false;}
else outputField。
setText(outputField。getText()+actionCommand);
break;
case '+':case '-':case '*':case '/':
if(firstInput)model。
setOperate(actionCommand);
else{
model。setOperateNumber(Double。parseDouble(outputField。getText()));
model。
calculating();
model。setOperate(actionCommand);
outputField。setText(String。valueOf(model。getResult()));
firstInput=true;
}
break;
case '=':
if(firstInput){
model。
calculating();
outputField。setText(String。valueOf(model。getResult()));
}
else{
model。setOperateNumber(Double。
parseDouble(outputField。getText()));
model。calculating();
outputField。setText(String。valueOf(model。
getResult()));
firstInput=true;
}
} } }
public static void main(String args[]){
new Calculate_GUI()。
registEvent();
}
}
2 文件名 Calculate_Model。java
public class Calculate_Model{
private double result;
private double operateNumber;
private char operate;
public Calculate_Model(){
result=0;
operateNumber=0;
operate=' ';
}
public void setResult(double n){
result=n;
}
public void setOperate(char o){
operate=o;
}
public void setOperateNumber(double n){
operateNumber=n;
}
public double getResult(){
return result;
}
public void calculating(){
switch(operate){
case ' ':result=operateNumber;break;
case '+':result+=operateNumber;break;
case '-':result-=operateNumber;break;
case '*':result*=operateNumber;break;
case '/':result/=operateNumber;break;
}
}
public void reset(){
result=0;
operateNumber=0;
operate=' ';
}
public double toSign(double n){
return 0-(n-0);
}
public String backSpace(String n){
String reResult="0";
try{
reResult=n。
substring(0,n。length()-1);
Double。parseDouble(reResult);
}
catch(NumberFormatException e){reResult="0";}
return reResult;
}
}
两个文件同一目录；
javac Calculate_GUI。
java
javac Calculate_Model。java
java Calculate_GUI。收起
