基于 Java Swing 的个人所得税计算模拟器实现

这是一个使用 Java Swing 开发的个人所得税计算模拟器，模拟了官方个税 APP 的核心功能，包括综合所得年度汇算计算、税率表查询、专项扣除项目设置及税务计算结果展示。

一、项目简介

项目特点：

• 100% 纯 Java 实现，无第三方依赖
• 完整 GUI 界面，支持用户交互
• 详细的代码注释
• 遵循 2023 年最新个税政策

二、核心代码实现

1. 主程序入口

package com.tax.calculator;

import javax.swing.*;

/**
 * 个人所得税计算模拟器 - 主程序
 * @author TaxDeveloper
 * @version 1.0
 */
public class PersonalIncomeTaxApp {
    public static void main(String[] args) {
        // 使用 SwingUtilities 确保线程安全
        SwingUtilities.invokeLater(() -> {
            try {
                // 设置系统外观
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                
                // 创建并显示主窗口
                TaxCalculatorFrame frame = new TaxCalculatorFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
                
                System.out.println("个人所得税计算模拟器启动成功！");
            } catch (Exception e) {
                e.printStackTrace();
                JOptionPane.showMessageDialog(null, 
                    "程序启动失败：" + e.getMessage(), 
                    "错误", 
                    JOptionPane.ERROR_MESSAGE);
            }
        });
    }
}

2. 个税计算核心类

package com.tax.calculator;

import java.math.BigDecimal;
 java.math.RoundingMode;
 java.util.HashMap;
 java.util.Map;


   {  
    
    
       TaxBracket[] TAX_BRACKETS = {
         (, , , ),
         (, , , ),
         (, , , ),
         (, , , ),
         (, , , ),
         (, , , ),
         (, Double.MAX_VALUE, , )
    };  
    
    
       Map<String, BigDecimal> SPECIAL_DEDUCTIONS =  <>();  
    
     {
        
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ()); 
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
        SPECIAL_DEDUCTIONS.put(,  ());
    }  
    
    
      TaxResult  {
        
        
            ;  
        
        
           BigDecimal.valueOf(annualIncome);
           BigDecimal.valueOf(specialDeductions);
           BigDecimal.valueOf(additionalDeductions);
           BigDecimal.valueOf(BASIC_DEDUCTION);  
        
        
           income  
            .subtract(special)  
            .subtract(additional)  
            .subtract(basic)  
            .max(BigDecimal.ZERO); 
        
        
           findTaxBracket(taxableIncome.doubleValue());  
        
        
           taxableIncome  
            .multiply(BigDecimal.valueOf(bracket.getRate()))  
            .subtract(BigDecimal.valueOf(bracket.getQuickDeduction()));  
        
        
        taxAmount = taxAmount.max(BigDecimal.ZERO);  
        
        
           income.subtract(taxAmount);  
        
          (  
            income.doubleValue(),  
            taxableIncome.doubleValue(),  
            taxAmount.doubleValue(),  
            afterTaxIncome.doubleValue(),  
            bracket  
        );
    }  
    
    
      TaxBracket  {
         (TaxBracket bracket : TAX_BRACKETS) {
             (taxableIncome >= bracket.getLowerBound() &&  
                taxableIncome < bracket.getUpperBound()) {
                 bracket;
            }
        }
         TAX_BRACKETS[TAX_BRACKETS.length - ];
    }  
    
    
      Map<String, BigDecimal>  {
          <>(SPECIAL_DEDUCTIONS);
    }  
    
    
        {
           lowerBound;
           upperBound;
           rate;
           quickDeduction;  
        
          {
            .lowerBound = lowerBound;
            .upperBound = upperBound;
            .rate = rate;
            .quickDeduction = quickDeduction;
        }  
        
        
           {  lowerBound; }
           {  upperBound; }
           {  rate; }
           {  quickDeduction; }  
        
        
         String  {
             String.format(, rate * , quickDeduction);
        }
    }  
    
    
        {
           totalIncome;          
           taxableIncome;        
           taxAmount;            
           afterTaxIncome;       
          TaxBracket taxBracket;       
        
          {
            .totalIncome = totalIncome;
            .taxableIncome = taxableIncome;
            .taxAmount = taxAmount;
            .afterTaxIncome = afterTaxIncome;
            .taxBracket = taxBracket;
        }  
        
        
           {  totalIncome; }
           {  taxableIncome; }
           {  taxAmount; }
           {  afterTaxIncome; }
         TaxBracket  {  taxBracket; }  
        
        
         String  {
             String.format(
                 + 
                 + 
                 + 
                 + 
                 + 
                ,
                totalIncome, taxableIncome, taxAmount, afterTaxIncome, taxBracket
            );
        }
    }
}