个人所得税计算

public class TaxCalculation {
	public static void main(String[] args) {
		String a = JOptionPane.showInputDialog("请输入你的收入工资：");
		String b = JOptionPane.showInputDialog("请输入你的五险一金：");
		double salary = Double.parseDouble(a);
		double insurance = Double.parseDouble(b);

		salary = salary - insurance - 3500;
		if (salary <= 0) {
			JOptionPane.showMessageDialog(null, "你不需要缴纳个人所得税！");
		} else if (salary <= 1500) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.03));
		} else if (salary <= 4500) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.1 - 105));
		} else if (salary <= 9500) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.2 - 555));
		} else if (salary <= 35000) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.25 - 1005));
		} else if (salary <= 55000) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.3 - 2755));
		} else if (salary <= 80000) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.35 - 5505));
		} else if (salary < 80000) {
			JOptionPane.showMessageDialog(null, "你需要缴纳个人所得税为："
					+ (salary * 0.45 - 13505));
		}

	}
}