前言
我第一次写文章，就摸索了一会儿这个编辑器，排版可能不会太好，请见谅。主要还是上课时做了一个这个作业，个人感觉还行就分享给大家了。当然做得比我好的多了去了，我做的功能不是很多，可能还有遗留的bug，大家一起完善吧！
先看看运行的样子吧
色调借鉴了win10自带的计算器（我觉得挺好看的）
还是直接上代码吧
代码
感觉写得有点长，主要是为了完善功能，比如混合运算等一些细节上的问题，不知道大家有没有更好的方法。
package chap01;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class Calculator extends JFrame implements ActionListener{
private JTextField result = new JTextField("0");//结果显示
private String[] button={" ","Backspace","CE","C","MC","7","8","9","/","sqrt","MR","4","5","6","*","%","M-","1","2","3","-","1/x","M+","0","+/-",".","+","="};
private JButton Button[] = new JButton[button.length];//按钮组件
private String c="";//记录当前计算符号( + - * /)
private char[] str = new char[15];//记录输入数字
private int x=0,y=0,flag=0;//x 数字字符数组下标，y字符串数组下标，flag 判断小数点
private String[] number = new String[100];//存取计算数字字符串
private double n1=0,n2=0;//运算参数
private String M1="0",M2="0";//内存运算参数
private int mr=0,mc=0;//记录MR、MC按钮在数组里的下标
private JTextField M = new JTextField();
private JTextField MM = new JTextField();
public Calculator(){
super("拉垮的计算器");
Design();
}
//界面设计
public void Design() {
setSize(820,485);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(null);//绝对分布
setBackground(new Color(202,202,202));//设置背景颜色
result.setBounds(5, 0, 625, 70);
result.setHorizontalAlignment(JTextField.RIGHT);//文本输出靠右
result.setEditable(false);//不可键盘编辑
result.setFont(new Font("黑体",Font.PLAIN,50));//设置文本字体
result.setBorder(null);//边框透明
add(result);//加入组件
int x=5,y=75;
for(int i=0;i<button.length;i++) {
Button[i] = new JButton();
Button[i].setText(button[i]);//按钮文本
Button[i].setFont(new Font("黑体",Font.PLAIN,26));//设置组件字体
Button[i].setFocusPainted(false);//设置不绘制焦点
Button[i].setBorderPainted(false);//设置按钮边框透明
if(y==75&&x>5) {
Button[i].setBounds(x,y,170,70);
Button[i].setBackground(new Color(225,225,225));//设置按钮颜色
x+=175;
if(x>525) {
x=5;
y+=75;
}
}
else{
Button[i].setBounds(x,y,100,70);
if(button[i]==" "||button[i]=="MC"||button[i]=="MR"||button[i]=="M-"||button[i]=="M+"||button[i]=="/"||button[i]=="*"||button[i]=="-"||button[i]=="+"||button[i]=="sqrt"||button[i]=="%"||button[i]=="1/x") {
Button[i].setBackground(new Color(225,225,225));
if(button[i] == "MR") {
mr = i;
Button[i].setEnabled(false);
}
if(button[i] == "MC") {
mc = i;
Button[i].setEnabled(false);
}
}
else if(button[i]=="=") {
Button[i].setBackground(new Color(122,170,208));
}
else{
Button[i].setBackground(new Color(245,245,245));
}
if(x<525) {
x+=105;
}
else {
x=5;
y+=75;
}
}
add(Button[i]);
}
for(int i=0;i<button.length;i++) {
Button[i].addActionListener(this);//添加事件
}
MM.setBounds(635, 20, 185, 50);
MM.setHorizontalAlignment(JTextField.LEFT);
MM.setEditable(false);
MM.setText("内存:");
MM.setFont(new Font("黑体",Font.PLAIN,26));
MM.setBorder(null);
add(MM);
M.setBounds(635, 100, 185, 275);
M.setHorizontalAlignment(JTextField.CENTER);
M.setEditable(false);
M.setFont(new Font("黑体",Font.PLAIN,24));
M.setBorder(null);
add(M);
number[0]="0";
setResizable(false);//窗口用户不可放大
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO 自动生成的方法存根
String s = e.getActionCommand();
if(s=="sqrt"||s=="1/x") {
x=0;
}
else if(s=="+"||s=="-"||s=="*"||s=="/") {//加减乘除运算判断
if(y>1) {
Result();
}
c=s;
x=0;
System.out.println(number[y]);
if(number[y]==null) {//用于更改当前已选择运算符号时，保持y不变
y--;
}
y++;
System.out.println(number[y]);
flag=0;
}
else {
getnum(s);
}
switch(s){
case " ":
result.setText("后备隐藏能源!");//瞎搞
break;
case "C":
c = "0";
for(int i=0;i<number.length;i++) {//初始化
number[i] = null;
}
number[0]="0";
x=0;
y=0;
flag=0;
result.setText(c);
break;
case "sqrt":
double a1;
if(number[y]==null) {
a1 = Double.valueOf(number[y-1]);//String 转 double
}
else {
a1 = Double.valueOf(number[y]);
}
if(a1<0) {
result.setText("无效输入");
}
else {
a1 = Math.sqrt(a1);
result.setText(Judge(a1));
number[y] = String.valueOf(a1);
}
break;
case "%":
switch(c) {
case "+":
n1 = Double.valueOf(number[y-1]);
n2 = Double.valueOf(number[y]);
n2 = n1*n2/100;
result.setText(Judge(n2));
number[y] = String.valueOf(n2);
break;
case "-":
n1 = Double.valueOf(number[y-1]);
n2 = Double.valueOf(number[y]);
n2 = n1*n2/100;
result.setText(Judge(n2));
number[y] = String.valueOf(n2);
break;
case "*":
n2 = Double.valueOf(number[y]);
n2 = n2/100;
result.setText(Judge(n2));
number[y] = String.valueOf(n2);
break;
case "/":
n2 = Double.valueOf(number[y]);
n2 = n2/100;
result.setText(Judge(n2));
number[y] = String.valueOf(n2);
break;
}
break;
case "+/-":
double a4 = Double.valueOf(number[y]);
a4=-a4;
if(a4<0) {
for(int i=str.length-1;i>0;i--) {
str[i]=str[i-1];
}
str[0]='-';
x++;
}
else if(a4>0){
for(int i=0;i<str.length-1;i++) {
str[i]=str[i+1];
}
x--;
}
else {
a4 = 0;//a4会出现值为-0.0的情况，所以再次使a4=0
}
result.setText(Judge(a4));
number[y] = String.valueOf(a4);
break;
case "1/x":
double a5;
if(number[y]==null) {
a5 = Double.valueOf(number[y-1]);//String 转 double
}
else {
a5 = Double.valueOf(number[y]);
}
if(a5 == 0) {
result.setText("除数不能为零");
}
else {
a5=1/a5;
number[y] = String.valueOf(a5);
result.setText(Judge(a5));
}
break;
case "CE":
number[y]="0";
result.setText(number[y]);
x=0;
break;
case "Backspace":
if(x==0) {
result.setText("0");
}
else if(x==1) {
x--;
str[x]='0';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
}
else if(x==2 && Double.valueOf(number[y])<0) {//这里是负数退格的情况处理
x=0;
str[x]='0';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
}
else {
x--;
number[y] = String.valueOf(str,0,x);
result.setText(number[y]);
}
break;
case "=":
Result();
number[0] = number[y];
for(int i=1;i<number.length;i++) {
number[i] = null;
}
c = "0";
x=0;
y=0;
break;
case "M+":
Memory("M+");
Button[mr].setEnabled(true);
Button[mc].setEnabled(true);
break;
case "M-":
Memory("M-");
Button[mr].setEnabled(true);
Button[mc].setEnabled(true);
break;
case "MR":
result.setText(M1);//显示内存数值
break;
case "MC":
M1="0";
M2="0";
Button[mr].setEnabled(false);
Button[mc].setEnabled(false);
M.setText("");//清空内存
break;
}
}
//输入计算的数字
public void getnum(String cc) {
switch(cc) {
case "0":
str[x]='0';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "1":
str[x]='1';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "2":
str[x]='2';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "3":
str[x]='3';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "4":
str[x]='4';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "5":
str[x]='5';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "6":
str[x]='6';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "7":
str[x]='7';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "8":
str[x]='8';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case "9":
str[x]='9';
number[y] = String.valueOf(str,0,x+1);
result.setText(number[y]);
x++;
break;
case ".":
if(flag==0) {
if(x==0) {
str[x]='0';
str[x+1]='.';
number[y] = String.valueOf(str,0,x+2);
x++;
}
else {
str[x]='.';
number[y] = String.valueOf(str,0,x+1);
}
result.setText(number[y]);
x++;
flag=1;
}
break;
}
}
//加减乘除运算结果
public void Result(){
switch(c) {
case "+":
n1= Double.valueOf(number[y-1]);
n2= Double.valueOf(number[y]);
n1=n1+n2;
result.setText(Judge(n1));
number[y] = String.valueOf(n1);
break;
case "-":
n1= Double.valueOf(number[y-1]);
n2= Double.valueOf(number[y]);
n1=n1-n2;
result.setText(Judge(n1));
number[y] = String.valueOf(n1);
break;
case "*":
n1= Double.valueOf(number[y-1]);
n2= Double.valueOf(number[y]);
n1=n1*n2;
result.setText(Judge(n1));
number[y] = String.valueOf(n1);
break;
case "/":
n1= Double.valueOf(number[y-1]);
n2= Double.valueOf(number[y]);
n1=n1/n2;
result.setText(Judge(n1));
number[y] = String.valueOf(n1);
break;
}
}
//内存运算
public void Memory(String string) {
DecimalFormat format2 = new DecimalFormat(",#.#");//避免Double.valueof()无法转换带有逗号的字符串
M2 = number[y];
try {
n1 = format2.parse(M1).doubleValue();
} catch (ParseException e1) {
// TODO 自动生成的 catch 块
e1.printStackTrace();
}
n2 = Double.valueOf(M2);
if(string == "M+") {
n1 = n1 + n2;
}
else {
n1 = n1 - n2;
}
M1 = Judge(n1);
M.setText(M1);
}
//为了让输出的整数没有小数形式
public String Judge(double num) {
NumberFormat nf = NumberFormat.getInstance();//将数值转换为String类型(只保留三位小数)，会舍去整数后的小数形式
double num1 = num - (int)num;
if(num1>0) {
return String.valueOf(num);
}
else {
return nf.format(num);
}
}
//主函数
public static void main(String args[]) {
Calculator cl = new Calculator();
}
}总结
感觉直接贴个代码不太好，但我又不知该解释啥，感觉没啥内容，大家就在评论区交流吧。一起进步一起进步。
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