package A;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.*;
public class Calcular3 extends JFrame implements ActionListener,MouseListener{
private int m1=0,n=0;//
private double m2=0;//運算的數
private int flag=0;
JFrame f;
JPanel p1,p2,p3;
JTextField t;
JButton b1[]=new JButton[18];
String b[]= {"1","2","3","4","5","6","7","8","9","0","清空","退格",".","=","+","-","*","/"};
public Calcular3(){
f=new JFrame("計算器");
t=new JTextField(35);
p1=new JPanel();
p2=new JPanel();
p3=new JPanel();
f.setBounds(100, 100, 400, 200);
f.add(p1,BorderLayout.NORTH);
f.add(p2,BorderLayout.CENTER);
f.add(p3,BorderLayout.EAST);
p2.setLayout(new GridLayout(5,3));
p3.setLayout(new GridLayout(4,1));
p1.add(t);
for(int i=0;i<14;i++) {
b1[i]=new JButton(b[i]);
p2.add(b1[i]);
b1[i].addActionListener(this);
}
for(int i=14;i<18;i++) {
b1[i]=new JButton(b[i]);
p3.add(b1[i]);
b1[i].addActionListener(this);
}
/*for(int i=0;i<18;i++) {
b1[i].addActionListener(this);
}*/
f.setVisible(true);
}
//實現接口的方法
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void actionPerformed(ActionEvent e) {
String str="";
int i;
for(i=0;i<=9;i++) {
if(e.getSource()==b1[i]) {
if(i==9) {
n=n*10;
}else {
n=n*10+i+1;
}
str=String.valueOf(n);//整形n轉換成字符串str
t.setText(str);//顯示到文本框上
}
}
for(i=14;i<18;i++) {//+、-、*、/
if(e.getSource()==b1[i]) {//匹配運算符
m1=Integer.parseInt(t.getText());
if(flag==15) {
m2=m1+m2;
}else if(flag==16) {
m2=m1-m2;
}else if(flag==17) {
m2=m1*m2;
}else if(flag==18) {
m2=m1/m2;
}else m2=m1;//若無連續的運算符運算，保存當前數據到m2
if(i==14) flag=15;
else if(i==15) flag=16;
else if(i==16) flag=17;
else flag=18;
str=String.valueOf(b[i]);
t.setText(str);//顯示到文本框上
n=0;//還原，記錄下次數據
break;//找到匹配數據退出循環
}
}
if(e.getSource()==b1[13]) {//=
m1=Integer.parseInt(t.getText());
if(flag==15) {
m2=m2+m1;
}else if(flag==16) {
m2=m2-m1;
}else if(flag==17) {
m2=m2*m1;
}else if(flag==18) {
m2=m2/m1;
}else m2=m1;
str=String.valueOf(m2);
t.setText(str);//顯示到文本框上
n=0;//還原，記錄下次數據
flag=0;//flag還原0，表明沒有未處理的運算符
}
if(e.getSource()==b1[10]) {//各變量變為0 清空
m1=0;
m2=0;
flag=0;
n=0;
t.setText("0");//顯示到文本框上
}
if(e.getSource()==b1[11]) {//退格
m1=(int)(Double.parseDouble(t.getText())/10);
n=m1;
str=String.valueOf(m1);
t.setText(str);
}
if(e.getSource()==b1[12]) {//小數點
m1=Integer.parseInt(t.getText());
str=String.valueOf(m1+b[12]);
t.setText(str);//顯示到文本框上
int j=0;
for(i=0;i<=9;i++) {
if(e.getSource()==b1[i]) {
j++;
m2=Math.pow(0.1, j)*Integer.parseInt(b[i]);
str=String.valueOf(m1+m2);
t.setText(str);//顯示到文本框上
}
}
}
}
//主函數
public static void main(String[] args) {
new Calcular3();
}
}
