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毕业设计需求

计算机毕业设计中用Java的swing开发一个简易计算器

 源码,如下:

package cn.sjy.calculator;

import javax.swing.*;
import java.awt.*;

/**
* 简易计算器
* @author 石俊熠
* 2020.7.13 11:24
* 注:仿照某Java大佬的源码改之
*/

public class Test {
private String str=" ";//输入输出框显示内容
private JTextField input;//输出框
private JPanel button;//按钮区域
private String[] addbutton={"AC","求根","取反","/","7","8","9","*","4","5","6","-","1","2","3","+","+/-","0",".","="};
private String showTextFiledNew;

//设置主窗体
public Test() {
//初始化窗体
JFrame f = new JFrame("计算器");
Container c = f.getContentPane();
c.setLayout(new BoxLayout(f.getContentPane(), BoxLayout.Y_AXIS));//设置排列布局为Y轴排列

f.setLocation(200, 300);
//f.setSize(500, 600);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);

input = new JTextField(30);//设置输入框的长度为30
input.setHorizontalAlignment(JTextField.RIGHT);//设置输入框内容的对齐方式,设置为右对齐
JPanel jPanel = new JPanel();//建立一个面板
jPanel.add(input);
c.add(jPanel);

GridBagLayout gridBagLayout = new GridBagLayout();
GridBagConstraints cs = new GridBagConstraints();
button = new JPanel();
button.setLayout(gridBagLayout);
for (int i = 0; i < addbutton.length; i++) {
if ((i + 1) % 4 == 0) {
cs.gridwidth = GridBagConstraints.REMAINDER;
} else {
cs.fill = GridBagConstraints.BOTH;//使组件完全填充其显示区域
cs.weightx = 1.0;
cs.gridwidth = 1;
}
JButton b = new JButton(addbutton[i]);
gridBagLayout.setConstraints(b, cs);//设置组件的约束
b.addActionListener(e -> {
String command = e.getActionCommand();
setShowTextFiledNew(command);
});
button.add(b);
}
c.add(button);
f.pack();
}

/**
* 设置显示内容得窗体
* @param command 按钮点击命令
* 如果按下=执行计算命令
* 如果按下运算符 则格式为 空格+运算符+空格
* 如果按下数字 则直接拼接
*/

public void setShowTextFiledNew(String command) {
if(command.equals("=")){
str = getResult(str);
}else if(command.equals("+")||command.equals("-")||command.equals("*")||command.equals("/")||command.equals("求根")||command.equals("取反")){
str = str+" "+command+" ";
}else if(command.equals("AC")){
str = "";
}else{
str = str+command;
}
input.setText(str);//将按钮的信息返回到input中
}

/**
* 计算模块
* @param str 需要计算的字符串
* 根据空格进行分割成字符串数组
* 然后判断是哪种类型进行计算
*通过一个result来存放那个结果
*/

private String getResult(String str) {
Double result = 0.0;//用来存放结果
String[] need = str.split(" ");//进行字符串分割
for (String j : need) {
System.out.print(j+" ");
}
for (int i = 0; i < need.length; i++) {
switch (need[i]){
case "+":
if (result == 0.0 && i==1){
result=result+(Double.parseDouble(need[i-1])+Double.parseDouble(need[i+1]));
break;
}else{
result=result+Double.parseDouble(need[i+1]);
break;
}
case "-":
if(Double.parseDouble(need[i-1])>=Double.parseDouble(need[i+1])){
result = (Double.parseDouble(need[i-1])-Double.parseDouble(need[i+1]));
break;
}else {
result = +(Double.parseDouble(need[i-1])-Double.parseDouble(need[i+1]));
break;
}
case "*":
result=result+(Double.parseDouble(need[i-1])*Double.parseDouble(need[i+1]));
break;
case "/":
result=result+(Double.parseDouble(need[i-1])/Double.parseDouble(need[i+1]));
break;
case "求根":
result=result+(Math.sqrt(Double.parseDouble(need[i-1])));
break;
case "取反":
result=result+(-Double.parseDouble(need[i-1]));
break;
}
}
return result+"";
}

//设置主方法,调用Test方法
public static void main(String[] args ){
new Test();
}
}

效果如图

 

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