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POMy boolean of an object gets changed without the program doing anything
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  1. POMy boolean of an object gets changed without the program doing anything
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    copied!<p>I've been debugging for hours, and I finally found where the problem is. NOW I have to fix it :)</p> <p>I thinks something strange happens. </p> <p>I'm creating an date app, where I calculate which day it is (with leapyear corrections etc). </p> <p>I have a method, where I take a Year object. </p> <pre><code>private int totalDays(Year yearnumber) { System.out.println("Boolean check 1: " + yearnumber.getLeapYear()); //calculate days for whole year// int daysWholeYear = 0; for (int i = year.getYearZero(); i &lt; yearnumber.getYear(); i++) { // here i will add all the days (366) from the leapyears // if (yearnumber.isLeapYear(i) == true) { totalDays += year.getLengthyear() + 1; System.out.println("Boolean check 2: " + yearnumber.getLeapYear()); } else { totalDays += year.getLengthyear(); } } System.out.println("Boolean check 3: " + yearnumber.getLeapYear()); </code></pre> <p>My first two boolean checks are ok.</p> <p>Code (without the boolean check looped in the for loop)</p> <pre><code>Boolean check 1: true Boolean check 2: true Boolean check 3: false </code></pre> <p>I need my Boolean in the next lines of my method, where I calculate the days of the months (non whole years). However, my program now thinks that the year is not a leap year and therefore makes wrong calculations. </p> <p>Because this Boolean changes in my program, the rest of my calculation are off. Can someone explain my why this happens? :)</p> <p>EDIT: code from my year class: </p> <pre><code>public class Year { private static int yearzero = 1753; private static int lengthYear = 365; private int year; private boolean leapYear; private int startYear; //are used for an interval calculations private int eindYear; // public Year(int year) { this.year = year; this.leapYear = isLeapYear(year); } boolean isLeapYear(int year) { return leapYear = (year % 400 == 0) || ((year % 100) != 0 &amp;&amp; (year % 4 == 0)); } public int getYear(){ return year; } public int getYearzero () { return yearZero; } public int getLengthYear() { return lengthYear; } public boolean getLeapYear() { return leapYear; } </code></pre> <p>}</p>
 

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