texframe.java

用java开发的一个个人所得税计算程序

package 实验一;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class TexFrame extends JFrame{
    JTable table;
    Object name[]={"级别","应纳所得额(>)","应纳所得额(<=)","税率"};
    Object level[][]={{1,0,500,0.05},{2,500,2000,0.10},
                      {3,2000,5000,0.15},{4,5000,20000,0.20},
                      {5,20000,"",0.25}};    //设置表格个单元的初始值
    JPanel p,p1;
    JButton count;        //计算按钮
    JButton change;       //修改免征基数按钮
    JTextField start;     //显示免征基数
    JTextField input;     //输入计算总额
    JTextField output;    //输出计算结果
    TexFrame(String s) {
        super(s);
        start=new JTextField(10);
        start.setText(JumpoffPoint+"");     //默认初始显示1600
        change=new JButton("修改免征基数");
        count=new JButton("计算");
        input=new JTextField(10);
        output=new JTextField(10);
        table=new   JTable(level,name){   
            public   boolean   isCellEditable(int   row,   int   column){
                if (column==0||column==1||column==2) return   false;
                else 
                    return true;
            }
        };           //新建表格，并设置第一、二、三列不可修改
        p1=new JPanel();
        p1.add(new JLabel("免征基数"));
        p1.add(start);
        p1.add(change);
        p=new JPanel();
        p.add(new JLabel("输入金额"));
        p.add(input);
        //input.setText(money+"");       //输入金额初始显示0
        p.add(count);
        ah=new ActionHandler(this);
        count.addActionListener(ah);    //添加事件监听器
        change.addActionListener(ah);   //添加事件监听器
        p.add(new JLabel("应纳的税额"));
        p.add(output);
        //设置窗口布局
        getContentPane().add(p1,BorderLayout.NORTH);
        getContentPane().add(p,BorderLayout.SOUTH);
        getContentPane().add(new JScrollPane(table),BorderLayout.CENTER);
        
        setSize(500,250);
        setLocation(300,100);
        setVisible(true);
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    public void setMoney(float m) {    //设置计算金额
        money=m;
    }
   public float getResult() {          //获取计算结果
        return result;
    }
    public void chJumpoffPoint(int m) {//修改免征基数
        JumpoffPoint=m;
    }
    private int countLevel(float m) {//判断输入金额所在的层次
        if (m<=JumpoffPoint)
            return 0;
        else if (m-JumpoffPoint<=Integer.parseInt(level[0][2].toString()))
            return 1;
        else if (m-JumpoffPoint<=Integer.parseInt(level[1][2].toString()))
            return 2;
        else if (m-JumpoffPoint<=Integer.parseInt(level[2][2].toString()))
            return 3;
        else if (m-JumpoffPoint<=Integer.parseInt(level[3][2].toString()))
            return 4;
        else
            return 5;
    }
    public void counter(){            //计算个人所得税
        switch(countLevel(money)){
            case 0:                    //收入未达到起征点
                result=0;
                break;
            case 1:                    //第一层
                result=((money - JumpoffPoint)
                        * Float.parseFloat(level[0][3].toString()));
                break;
            case 2:                  //第二层
                result=
                        Integer.parseInt(level[0][2].toString())*Float.parseFloat(level[0][3].toString())
                        +(money-JumpoffPoint-Integer.parseInt(level[1][1].toString()))*Float.parseFloat(level[1][3].toString());
                break;
            case 3:                   //第三层
                result=
                        Integer.parseInt(level[0][2].toString())*Float.parseFloat(level[0][3].toString())
                        +(Integer.parseInt(level[1][2].toString())-Integer.parseInt(level[1][1].toString()))*Float.parseFloat(level[1][3].toString())
                        +(money-JumpoffPoint-Integer.parseInt(level[2][1].toString()))*Float.parseFloat(level[2][3].toString());
                break;
            case 4:                  //第四层
                result=
                        Integer.parseInt(level[0][2].toString())*Float.parseFloat(level[0][3].toString())
                        +(Integer.parseInt(level[1][2].toString())-Integer.parseInt(level[1][1].toString())*Float.parseFloat(level[1][3].toString()))
                        +(Integer.parseInt(level[2][2].toString())-Integer.parseInt(level[2][1].toString()))*Float.parseFloat(level[2][3].toString())
                        +(money-JumpoffPoint-Integer.parseInt(level[3][1].toString()))*Float.parseFloat(level[3][3].toString());
                break;
            case 5:                //第五层
                result=
                        Integer.parseInt(level[0][2].toString())*Float.parseFloat(level[0][3].toString())
                        +(Integer.parseInt(level[1][2].toString())-Integer.parseInt(level[1][1].toString())*Float.parseFloat(level[1][3].toString()))
                        +(Integer.parseInt(level[2][2].toString())-Integer.parseInt(level[2][1].toString()))*Float.parseFloat(level[2][3].toString())
                        +(Integer.parseInt(level[3][2].toString())-Integer.parseInt(level[3][1].toString()))*Float.parseFloat(level[3][3].toString())
                        +(money-JumpoffPoint-Integer.parseInt(level[4][1].toString()))*Float.parseFloat(level[4][3].toString());
                break;
        }
    }
    private float money=0;              //输入计算金额
    private float result;               //计算结果
    private int JumpoffPoint=1600;      //起征点
    private ActionHandler ah;           //事件响应
}