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POunable to call another method within a method in java
 

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    <p>I have this class called Date:</p> <pre><code>public class Date { // fields private int month; private int day; private int year; // constructor public Date(int month, int day, int year) { this.month = month; this.day = day; this.year = year; } //check for leap year or not public static boolean isLeap(int year) { if (year % 4 != 0) { return false; } else if (year % 400 == 0) { return true; } else if (year % 100 == 0) { return false; } else { return true; } } public static boolean isValid(int month, int day, int year) { if (year &lt; 1900) { return false; } else { if (month &gt; 0 &amp;&amp; month &lt; 13) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return day &gt; 0 &amp;&amp; day &lt;= 31; } else if (month == 4 || month == 6 || month == 9 || month == 11) { return day &gt; 0 &amp;&amp; day &lt;= 30; } else if (month == 2) { if (isLeap(year)) { return day &gt; 0 &amp;&amp; day &lt;= 29; } else { return day &gt; 0 &amp;&amp; day &lt;= 28; } } } else { return false; } } return true; } public int getMonth() { return month } public void setMonth(int month) { this.month = month; } public int getDay() { return day; } public void setDay(int day) { this.day = day; } public int getYear() { return year; } public void setYear(int year) { this.year = year; } public void setDate(int month, int day, int year) { if (isValid(month, day, year)) { setDay(day); setMonth(month); setYear(year); } else { setDay(1); setMonth(1); setYear(1900); } } // public String displayDate() { return month + "/" + day + "/" + year; } public String add(int n) { if (n &lt;= 20) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { if ((day + n &gt; 0) &amp;&amp; (day + n &lt;= 31)) day = day + n; else month += 1; if (month &gt; 12) year += 1; } if (month == 4 || month == 6 || month == 9 || month == 11) { if ((day + n &gt; 0) &amp;&amp; (day + n &lt;= 30)) day = day + n; else month += 1; if (month &gt; 12) year += 1; } } return month + "/" + day + "/" + year; } public String sub(int n) { if (n &lt;= 20) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) if (day - n &lt; 0) day = 31 + day - n; else month -= 1; if (month &lt; 0) year -= 1; if (month == 4 || month == 6 || month == 9 || month == 11) if ((day - n &lt; 0)) day = 30 + day - n; else month -= 1; if (month &lt; 0) year -= 1; } return month + "/" + day + "/" + year; } } </code></pre> <p>And this class to to test the Date class:</p> <pre><code>public class MyDateTester { public static void main(String[] args) { new MyDateTester(); } Date theClass; public MyDateTester(){ theClass = new Date(6,1,1600); System.out.print("Month is: "); System.out.println(theClass.getMonth()); System.out.print("Day is: "); System.out.println(theClass.getDay()); System.out.print("Year is: "); System.out.println(theClass.getYear()); System.out.println(theClass.displayDate()); System.out.println(theClass.add(20)); System.out.println(theClass.isValid(6,1,2000)); } } </code></pre> <p>When I give 6, 1, 1600 values to Date, it is still printing 6,1,1600, isValid method in setDate method is not setting the dates right. Any ideas?</p>
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    1. USuser1471980
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    1. COAny reason why you use a custom date implementation when the JDK has a builtin `Date` (which implements `Comparable` of itself to boot)?
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    2. COdo you get any error or warining?
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      1. USBhavik Shah
    3. COyou have to use the class name to call the static function.eg if isValid belongs to class A then A.isValid(month,day,year) is the correct way to call the method.
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