144 lines
4.9 KiB
Java
144 lines
4.9 KiB
Java
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import java.util.*;
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public class RetirementCalculatorModel
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{
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/* input fields */
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private HashMap<String, Double> myFields;
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public RetirementCalculatorModel()
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{
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myFields = new HashMap<String, Double>();
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reset();
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}
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public void setField(String name, double value)
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{
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myFields.put(name, value);
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}
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public double getField(String name)
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{
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return (myFields.containsKey(name)) ? myFields.get(name) : 0;
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}
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public void reset()
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{
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myFields.clear();
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setField("current income", 0);
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setField("income wanted", 0);
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setField("employer pension", 0);
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setField("part time income", 0);
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setField("other income", 0);
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setField("age", 30);
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setField("retirement age", 65);
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setField("savings", 0);
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setField("life expectancy", 82);
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calculate();
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}
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public void calculate()
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{
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setField("social security", calculateSocialSecurity());
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setField("amount to make up",
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getField("income wanted") -
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getField("social security") -
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getField("employer pension") -
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getField("part time income") -
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getField("other income"));
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setField("amount to save",
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getField("amount to make up") * calculateMakeUpFactor());
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setField("early retirement penalty",
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getField("social security") * calculateEarlyRetirementFactor());
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setField("estimated savings",
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getField("savings") * calculateSavingsFactor());
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setField("total additional savings needed",
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getField("amount to save") +
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getField("early retirement penalty") -
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getField("estimated savings"));
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setField("annual savings needed",
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getField("total additional savings needed") *
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calculateTotalSavingsFactor());
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}
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private double calculateMakeUpFactor()
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{
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int retire_age_index = (int) getField("retirement age");
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int life_expectancy_index = (int) getField("life expectancy");
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if (retire_age_index == 55) retire_age_index = 0;
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else if (retire_age_index == 60) retire_age_index = 1;
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else if (retire_age_index == 70) retire_age_index = 3;
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else retire_age_index = 2;
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if (life_expectancy_index == 86) life_expectancy_index = 1;
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else if (life_expectancy_index == 89) life_expectancy_index = 2;
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else if (life_expectancy_index == 92) life_expectancy_index = 3;
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else if (life_expectancy_index == 94) life_expectancy_index = 4;
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else if (life_expectancy_index == 97) life_expectancy_index = 5;
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else life_expectancy_index = 0;
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final double makeup_factors[] = {
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18.79, 20.53, 21.71, 22.79, 23.46, 24.40,
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16.31, 18.32, 19.68, 20.93, 21.71, 22.79,
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13.45, 15.77, 17.35, 18.79, 19.68, 20.93,
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10.15, 12.83, 14.65, 16.31, 17.35, 18.79
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};
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return makeup_factors[retire_age_index * 6 + life_expectancy_index];
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}
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private double calculateEarlyRetirementFactor()
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{
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int retire_age_index = (int) getField("retirement age");
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if (retire_age_index == 55) return 8.8;
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else if (retire_age_index == 60) return 4.7;
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else return 0.0;
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}
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private double calculateSocialSecurity()
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{
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double current_income = getField("current income");
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if (current_income < 25000.0)
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return 8000.0;
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else if (current_income <= 40000.0)
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return 12000.0;
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else
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return 14500.0;
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}
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private double calculateSavingsFactor()
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{
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int savings_factor_index = calculateFiveYearsToRetirement() - 2;
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double savings_factors[] = {
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1.3, 1.6, 1.8, 2.1, 2.4, 2.8, 3.3
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};
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return savings_factors[savings_factor_index];
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}
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private double calculateTotalSavingsFactor()
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{
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int total_savings_factor_index = calculateFiveYearsToRetirement() - 2;
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double total_savings_factors[] = {
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0.085, 0.052, 0.036, 0.027, 0.020, 0.016, 0.013
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};
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return total_savings_factors[total_savings_factor_index];
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}
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private int calculateFiveYearsToRetirement()
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{
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double retire_age = getField("retirement age");
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double current_age = getField("age");
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double years_to_retirement = retire_age - current_age;
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int five_years_to_retirement =
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(int) ((years_to_retirement + 2.5) / 5.0);
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if (five_years_to_retirement < 2)
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five_years_to_retirement = 2;
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if (five_years_to_retirement > 8)
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five_years_to_retirement = 8;
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return five_years_to_retirement;
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}
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}
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