import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
public class Jsq extends JFrame
{
Panel pan1=new Panel();
Panel pan2=new Panel();
Panel pan3=new Panel();
Panel pan4=new Panel();
Panel pan5=new Panel();
Label la1=new Label("歡迎使用計算器");
Button bt1=new Button(" ");
Button bt2=new Button("MC");
Button bt3=new Button("MR");
Button bt4=new Button("MS");
Button bt5=new Button("M+");
Button bt11=new Button("Backspace");
Button bt12=new Button("CE");
Button bt13=new Button("C");
Button but[]=new Button[20];
String buta[]={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","-/+",".","+","="};
JTextField t1=new JTextField("0");//swing組件,可以設置對齊方式
double a=0;//記錄計算中的值或結果
String b="";//“+,-,*,/”運算符號標記
int d=0; //是否剛剛按過運算符號標記
int x=0; //是否剛剛按過“=”號標記
int y=0; //屏幕剛剛出現過漢字的標記
public Jsq()
{
super("計算器");
add(pan1,BorderLayout.NORTH);
add(pan4,BorderLayout.CENTER);
add(pan3,BorderLayout.WEST);
pan3.setLayout(new GridLayout(0,1,10,10));
pan3.add(bt1);pan3.add(bt2);pan3.add(bt3);pan3.add(bt4);pan3.add(bt5);
pan4.setLayout(new BorderLayout());
pan4.add(pan5,BorderLayout.NORTH);
pan4.add(pan2,BorderLayout.CENTER);
pan5.setLayout(new GridLayout(1,3,5,5));
pan5.add(bt11);pan5.add(bt12);pan5.add(bt13);
pan1.setLayout(new GridLayout(3,1));
pan1.add(la1);
pan1.add(t1);
t1.setEditable(false);//文本框設置為不可修改
t1.setHorizontalAlignment(JTextField.RIGHT);//設置文本框對齊方式
pan2.setLayout(new GridLayout(4,5,10,10));
for(int i=0;i<20;i++)
{
but[i]=new Button(buta[i]);
pan2.add(but[i]);
}
but[0].addActionListener(new A());
but[1].addActionListener(new A());
but[2].addActionListener(new A());
but[3].addActionListener(new A());
but[4].addActionListener(new A());
but[5].addActionListener(new A());
but[6].addActionListener(new A());
but[7].addActionListener(new A());
but[8].addActionListener(new A());
but[9].addActionListener(new A());
but[10].addActionListener(new A());
but[11].addActionListener(new A());
but[12].addActionListener(new A());
but[13].addActionListener(new A());
but[14].addActionListener(new A());
but[15].addActionListener(new A());
but[16].addActionListener(new A());
but[17].addActionListener(new A());
but[18].addActionListener(new A());
but[19].addActionListener(new A());
bt11.addActionListener(new A());
bt12.addActionListener(new A());
bt13.addActionListener(new A());
bt1.addActionListener(new A());
bt2.addActionListener(new A());
bt3.addActionListener(new A());
bt4.addActionListener(new A());
bt5.addActionListener(new A());
}
class A implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==but[0]) //"7"
{
if(x==1) //判斷是否剛剛按過"="
{
t1.setText("7");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{ //如果顯示為"0"或"0.0"或者剛剛按過運算符號
t1.setText("7"); //或者屏幕顯示為漢字 那麽顯示為"7"
y=0;//將標記設置為0
}
else
t1.setText(t1.getText()+"7");//將顯示的字符串後面加"7"
d=0;//將標記設置為0
if(t1.getText().length()>40)//判斷顯示字符長度是否超過40
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[1]) //"8"
{
if(x==1)
{
t1.setText("8");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("8");
y=0;
}
else
t1.setText(t1.getText()+"8");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[2]) //"9"
{
if(x==1)
{
t1.setText("9");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("9");
y=0;
}
else
t1.setText(t1.getText()+"9");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[3]) //"/"
{
if(y==1) //判斷顯示的是否為漢字
{
t1.setText("0");
y=0;
}
if(d==0) //判斷是否剛剛按過運算符號 防止連續按運算符號產生錯誤
{
if(b.equals("+"))//四則混合運算時 判斷上次計算是否為"+"
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))//四則混合運算時 判斷上次計算是否為"-"
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))//四則混合運算時 判斷上次計算是否為"*"
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))//四則混合運算時 判斷上次計算是否為"/"
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)//判斷除數是否為0
{
t1.setText("錯誤!請按“CE”清屏後繼續計算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(b.equals(""))//判斷進行的是不是四則混合運算的第壹次運算
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("錯誤!請按“CE”清屏後繼續計算"))//是否出現了除數為零的錯誤
{
b="/";//運算符號標記設置為"/"
d=1; //標記已經按過運算符號
}
if(t1.getText().length()>40)//判斷顯示字符長度是否超過40
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;//將記憶的數字抹去
b="";//運算符號標記 為未按過運算符號
d=0;//標記 剛剛沒有按過運算符號
y=1;//標記 屏幕顯示了漢字
}
}
if(e.getSource()==but[4]) //"sqrt"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();
if(f<0) //判斷被開放數是否小於零
{
t1.setText("錯誤!被開方數小於0,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
else
{
f=Math.sqrt(f);
t1.setText(""+(f));
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[5]) //"4"
{
if(x==1)
{
t1.setText("4");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("4");
y=0;
}
else
t1.setText(t1.getText()+"4");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[6]) //"5"
{
if(x==1)
{
t1.setText("5");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("5");
y=0;
}
else
t1.setText(t1.getText()+"5");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[7]) //"6"
{
if(x==1)
{
t1.setText("6");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("6");
y=0;
}
else
t1.setText(t1.getText()+"6");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[8]) //"*"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("錯誤!請按“CE”清屏後繼續計算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("錯誤!請按“CE”清屏後繼續計算"))
{
b="*";
d=1;
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[9]) //"%"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+(f/100));
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[10]) //"1"
{
if(x==1)
{
t1.setText("1");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("1");
y=0;
}
else
t1.setText(t1.getText()+"1");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[11]) //"2"
{
if(x==1)
{
t1.setText("2");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("2");
y=0;
}
else
t1.setText(t1.getText()+"2");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[12]) //"3"
{
if(x==1)
{
t1.setText("3");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("3");
y=0;
}
else
t1.setText(t1.getText()+"3");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[13]) //"-"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("錯誤!請按“CE”清屏後繼續計算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("錯誤!請按“CE”清屏後繼續計算"))
{
b="-";
d=1;
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[14]) //"1/x"
{
if(y==1)
{
t1.setText("0");
y=0;
}
else
{
double f=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+(1/f));
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
}
if(e.getSource()==but[15]) //"0"
{
if(x==1)
{
t1.setText("0");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("0");
y=0;
}
else
t1.setText(t1.getText()+"0");
d=0;
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[16]) //"-/+"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+(-f));
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[17]) //"."
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(t1.getText().indexOf(".")==-1)//判斷是否已經有"."
{
t1.setText(t1.getText()+".");
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[18]) //"+"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("錯誤!請按“CE”清屏後繼續計算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("錯誤!請按“CE”清屏後繼續計算"))
{
b="+";
d=1;
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==but[19]) //"="
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("錯誤!請按“CE”清屏後繼續計算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(!t1.getText().equals("錯誤!請按“CE”清屏後繼續計算"))
{
b="";
d=1;
x=1;
}
if(t1.getText().length()>40)
{
t1.setText("錯誤!數字過長,請按“C”從新輸入");
a=0.0;
b="";
d=0;
y=1;
}
}
if(e.getSource()==bt11) //"Backspace"
{
if(y==1)
{
t1.setText("0");
y=0;
}
else
{
String s1=t1.getText();
if(s1.length()==1)//如果將顯示的數字全部退掉 則顯示"0"
{
t1.setText("0");
}
else
{
t1.setText(s1.substring(0,(s1.length()-1)));//退格
}
}
}
if(e.getSource()==bt12) //"CE"
{
t1.setText("0");//清屏
}
if(e.getSource()==bt13) //"C" 初始化
{
t1.setText("0");
a=0.0;
b="";
d=0;
}
if(e.getSource()==bt1) //""
{
}
if(e.getSource()==bt2) //"MC"
{
}
if(e.getSource()==bt3) //"MR"
{
}
if(e.getSource()==bt4) //"MS"
{
}
if(e.getSource()==bt5) //"M+"
{
}
}
}
public static void main(String args[])
{
Jsq a=new Jsq();
a.setSize(300,250);
a.setVisible(true);
}
}