Question:
I need to calculate business hours i.e, from 0900 - 1700 for all weekdays. I am having a timer which starts on Sunday night and ends by Saturday morning. I need to exclude all non business hours and exclude weekends and calculate the working hours alone. The timer may start any time like on wednesday noon and end by friday noon also. I only want the business hours taken. 

Solution:

You'll need a definition on what the business hours are. For instance: 

Code:

public class BusinessHours 
{ 
    private Entry[] entries = new Entry[Calendar.SATURDAY + 1]; 

    // initialize entries 

    public boolean contains(Calendar calendar) 
    { 
        int weekDay = calendar.get(Calendar.DAY_OF_WEEK); 
        Entry entry = entries[weekDay]; 
        if (entry != null) 
        { 
            int hour = calendar.get(Calendar.HOUR_OF_DAY); 
            int minute = calendar.get(Calendar.MINUTE); 
            int time = hour * 100 + minute; 
            return time >= entry.start && time <= entry.end; 
        } 
        return false; 
    } 

    public static class Entry 
    { 
        private int weekDay; 

        private int start; // minutes in military style, e.g. 0930 

        private int end; // likewise 

        // constructors, getters, setters, ... 
    } 
} 
public class BusinessHours
{
    private Entry[] entries = new Entry[Calendar.SATURDAY + 1];

    // initialize entries

    public boolean contains(Calendar calendar)
    {
        int weekDay = calendar.get(Calendar.DAY_OF_WEEK);
        Entry entry = entries[weekDay];
        if (entry != null)
        {
            int hour = calendar.get(Calendar.HOUR_OF_DAY);
            int minute = calendar.get(Calendar.MINUTE);
            int time = hour * 100 + minute;
            return time >= entry.start && time <= entry.end;
        }
        return false;
    }

    public static class Entry
    {
        private int weekDay;

        private int start; // minutes in military style, e.g. 0930

        private int end; // likewise

        // constructors, getters, setters, ...
    }
}

This code only allows one entry per day, but you could use List<Entry>[] instead of Entry[] to allow multiple entries per day. 

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