1计算器的设计与实现
1.1程序界面
1.2程序源代码
import javax.swing.*;
import javax.swing.text.JTextComponent;
import java.util.StringTokenizer;
import java.awt.*;
import java.awt.event.*;
import java.math.*;
public class Calculator implements ActionListener {
JFrame jf=new JFrame("计算器");
JTextField tf=new JTextField();
JPanel pnl;
JButton jButtonDENG;
JButton jButtonJIAN;
JButton jButtonCHENG;
JButton jButton1;
JButton jButton2;
JButton jButton3;
JButton jButton4;
JButton jButton5;
JButton jButton6;
JButton jButton7;
JButton jButton8;
JButton jButton9;
JButton jButton0;
JButton jButtonCHU;
JButton jButtonQINGKONG;
JButton jButtonJIA;
JButton jButtonQUYU;
JButton jButtonPINGFANG;
JButton jButtonXIAOSHUDIAN;
JButton jButtonBACKSPACE;
JButton jButtonDAOSHU;
JButton jButtonKAIPINGFANG;
JButton jButtonERJINZHI;
JButton jButtonSHIJINZHI;
public Calculator (){ //初始化界面的方法
Container c=jf.getContentPane();
tf.setHorizontalAlignment(JTextField.RIGHT);
c.add(tf,"North");
JPanel pnl=new JPanel();
c.add(pnl,"Center");
pnl.setLayout(new GridLayout(6,5));
jButton1=new JButton("1");
jButton1.addActionListener(this);
pnl.add(jButton1);
jButton2=new JButton("2");
jButton2.addActionListener(this);
pnl.add(jButton2);
jButton3=new JButton("3");
jButton3.addActionListener(this);
pnl.add(jButton3);
jButtonBACKSPACE=new JButton("backspace");
jButtonBACKSPACE.addActionListener(this);
pnl.add(jButtonBACKSPACE);
jButton4=new JButton("4");
jButton4.addActionListener(this);
pnl.add(jButton4);
jButton5=new JButton("5");
jButton5.addActionListener(this);
pnl.add(jButton5);
jButton6=new JButton("6");
jButton6.addActionListener(this);
pnl.add(jButton6);
jButtonJIA=new JButton("+");
jButtonJIA.addActionListener(this);
pnl.add(jButtonJIA);
jButton7=new JButton("7");
jButton7.addActionListener(this);
pnl.add(jButton7);
jButton8=new JButton("8");
jButton8.addActionListener(this);
pnl.add(jButton8);
jButton9=new JButton("9");
jButton9.addActionListener(this);
pnl.add(jButton9);
jButtonJIAN=new JButton("-");
jButtonJIAN.addActionListener(this);
pnl.add(jButtonJIAN);
jButton0=new JButton("0");
jButton0.addActionListener(this);
pnl.add(jButton0);
jButtonQINGKONG=new JButton("清空");
jButtonQINGKONG.addActionListener(this);
pnl.add(jButtonQINGKONG);
jButtonCHENG=new JButton("*");
jButtonCHENG.addActionListener(this);
pnl.add(jButtonCHENG);
jButtonCHU=new JButton("/");
jButtonCHU.addActionListener(this);
pnl.add(jButtonCHU);
jButtonQUYU=new JButton("%");
jButtonQUYU.addActionListener(this);
pnl.add(jButtonQUYU);
jButtonPINGFANG=new JButton("平方");
jButtonPINGFANG.addActionListener(this);
pnl.add(jButtonPINGFANG);
jButtonXIAOSHUDIAN=new JButton(".");
jButtonXIAOSHUDIAN.addActionListener(this);
pnl.add(jButtonXIAOSHUDIAN);
jButtonDENG=new JButton("=");
jButtonDENG.addActionListener(this);
pnl.add(jButtonDENG);
jButtonDAOSHU=new JButton("倒数");
jButtonDAOSHU.addActionListener(this);
pnl.add(jButtonDAOSHU);
jButtonKAIPINGFANG=new JButton("开平方");
jButtonKAIPINGFANG.addActionListener(this);
pnl.add(jButtonKAIPINGFANG);
jButtonERJINZHI=new JButton("二进制");
jButtonERJINZHI.addActionListener(this);
pnl.add(jButtonERJINZHI);
jButtonSHIJINZHI=new JButton("十进制");
jButtonSHIJINZHI.addActionListener(this);
pnl.add(jButtonSHIJINZHI);
jf.setSize(600,400);
jf.setVisible(true);
}
public void actionPerformed(ActionEvent event){ //检测运算符的方法
try {
double wen=0;
String toknizer="+";
String ben;
String wenben=tf.getText()+event.getActionCommand();
tf.setText(wenben); //各运算符的判断运行代码
if(wenben.indexOf("*")!=-1) {
toknizer="*";
}
if(wenben.indexOf("+")!=-1) {
toknizer="+";
}
if(wenben.indexOf("-")!=-1) {
toknizer="-";
}
if(wenben.indexOf("/")!=-1) {
toknizer="/";
}
if(wenben.indexOf("%")!=-1) {
toknizer="%";
}
if(wenben.indexOf("平方")!=-1) {
toknizer="平方";
}
if(wenben.indexOf("倒数")!=-1) {
toknizer="倒数";
}
if(wenben.indexOf("开平方")!=-1) {
toknizer="开平方";
}
if(wenben.indexOf("二进制")!=-1) {
toknizer="二进制";
}
if(wenben.indexOf("十进制")!=-1) {
toknizer="十进制";
}
//各个运算符的运算方法代码
if(event.getSource()==jButtonQINGKONG){ //清空算法
wenben="";
tf.setText(wenben);
}
if(event.getSource()==jButtonBACKSPACE){ //清除算法
wenben=wenben.substring(0,wenben.length()-10);
tf.setText(wenben);
}
if(event.getSource()==jButtonDENG){ //"="算法
wenben=wenben.substring(0,wenben.length()-1);
double b[]=new double[10];
String a[]=new String[15];
StringTokenizer sun=new StringTokenizer(wenben,toknizer);
int i=0;
while(sun.hasMoreTokens()){
a[i++]=sun.nextToken();
}
for(int j=0;j<10;j++){
String s=a[j];
String k=a[j+1];
if(s==null){
break;
}else{
if(toknizer=="*"){ //"*"算法
if(j==0){wen=1;}
b[j]=Double.parseDouble(s);
wen=wen*b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}if(toknizer=="+"){ //"+" 算法
if(j==0){wen=0;}
b[j]=Double.parseDouble(s);
wen=wen+b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}if(toknizer=="-"){ //"-"算法
b[j]=Double.parseDouble(s);
if(j==0){wen=2*b[j];}
wen=wen-b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
if(toknizer=="/"){ // "/"算法
b[j]=Double.parseDouble(s);
if(j==0){wen=b[j]*b[j];}
wen=wen/b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
if(toknizer=="平方"){ //平方算法
if(j==0){wen=1;}
b[j]=Double.parseDouble(s);
wen=wen*b[j]*b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
if(toknizer=="倒数"){ //倒数算法
b[j]=Double.parseDouble(s);
wen=1/b[j];
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
if(toknizer=="开平方"){ //开平方算法
if(j==0){wen=0;}
b[j]=Double.parseDouble(s);
double wen1=sqrt(b[j]);
ben=Double.toString(wen1);
tf.setText(wenben+"="+ben);
}
JTextComponent textAnswer = null;
if (toknizer=="十进制") { //二进制转为十进制代码
//b[j]=Integer.parseInt(s);
wen =Integer.parseInt(s,2);
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
if (toknizer=="二进制") { //十进制转换为二进制代码
int den =Integer.parseInt(s);
String daen = Integer.toBinaryString(den);
tf.setText(wenben+"="+daen);
}
if(toknizer=="%"){ //"%"算法
if(j==0){
b[j]=Double.parseDouble(s);
b[j+1]=Double.parseDouble(k);
if(b[j]<b[j+1]){
wen=b[j];
} if(b[j]==b[j+1]) {
wen=0;
}
if(b[j]>b[j+1]) {
wen=b[j]%b[j+1];
}
} if(j>1) {
b[j]=Double.parseDouble(a[j]);
wen=wen%b[j];
}
ben=Double.toString(wen);
tf.setText(wenben+"="+ben);
}
}
}
}
}
catch(Exception e){
e.getMessage();
}
}
private int sqrt(double d) {
// TODO Auto-generated method stub
return 0;
}
//主函数
public static void main(String[]args) {
new Calculator(); //对小程序进行初始化
}
} |
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