java学习使用if···elseif···else计算员工个人所得税方式二，优化程序结构

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/*
个人所的税

*/
import java.util.Scanner;
public class Gerenshui{
	public static void main(String[]args){
		
		System.out.println("请输入工资数");
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();//局部变量，，
		
		double aprice = 0.0;
		/*  复杂计算
		if (a <= 5000){
			System.out.println("不用交税");
		}else if( a <= 8000){
			aprice = (a - 5000)*0.03;
		 
		}else if(a <= 17000){
			aprice = (a - 8000)*0.1 + (8000 - 5000)*0.03;
			
		}else if(a <= 30000){
			aprice = (a - 17000)*0.2 +(17000 - 8000)*0.1 + (8000 - 5000)*0.03;
			
		}else if(a <= 40000){
			aprice = (a - 30000)*0.25 + (30000 - 17000)*0.2 + (17000 - 8000)*0.1 + (8000 - 5000)*0.03  ;
			
		}else if(a <= 60000){
			aprice = (a - 40000)*0.3 +  (40000 - 30000)*0.25 + (30000 - 17000)*0.2 + (17000 - 8000)*0.1 + (8000 - 5000)*0.03 ;

		}else if(a <= 85000){
			aprice = (a - 60000)*0.35  + (60000 - 4000)*0.3 +  (40000 - 30000)*0.25 + (30000 - 17000)*0.2 + (17000 - 8000)*0.1 + (8000 - 5000)*0.03  ;
				
		}else {
			aprice = (a - 85000)*0.45 + (85000 - 60000)*0.35  + (60000 - 4000)*0.3 +  (40000 - 30000)*0.25 + (30000 - 17000)*0.2 + (17000 - 8000)*0.1 + (8000 - 5000)*0.03 ;
				
		}
		System.out.println("当工资为" + a +" 时需要缴纳的税"+aprice);
		*/
		// 优化方式  本月应缴纳所得额*对应的税率 - 速算扣除数
        if (a <= 5000){
			System.out.println("不用交税");
		}else if( a <= 8000){
			aprice = (a - 5000)*0.03 - 0;
		}else if( a <= 17000){
			aprice = (a - 5000)*0.1 - 210;
		}else if( a <= 30000){
			aprice = (a - 5000)*0.2 - 1410;
		}else if( a <= 40000){
			aprice = (a - 5000)*0.25 - 2660;
		}else if( a <= 60000){
			aprice = (a - 5000)*0.3 - 4410;
		}else if( a <= 85000){
			aprice = (a - 5000)*0.35 - 7160;
		}else {
			aprice = (a - 5000)*0.45 - 15160;
		}      
		System.out.println("当工资为" + a +" 时需要缴纳的税"+aprice);
	}
}