Recently, i was coding for an application and came across a problem where i need to sort an ArrayList in an alphabetical order. However, that sounded quite easy as because sorting can easy with single arraylist. But, i was in a situation where i had two different ArrayLists with multiple attributes. So, what i did is that i kept a delimeter to distinct all my 3 values and then i added them into a temporary list.
for(int j=0;j
{
myBean=(MyBean)myList.get(j);
tempList.add(myBean.getOne() + "*" + myBean.getTwo() + "*" + myBean.getThree());
}
then i used collection's sort method to sort them up in an alphabetical form.
Collections.sort(tempList,new MyComparator());
I used inner class called Mycomparator to compare.
class MyComparator implements Comparator {
public int compare(Object o1,
Object o2) {
String s1 = o1.toString().toUpperCase();
String s2 = o2.toString().toUpperCase();
int counter = 0;
for (counter=0;counter
!Character.isDigit(s1.charAt(counter));counter++);
String temp1 = s1.substring(counter);
s1 = s1.substring(0,counter);
for (counter=0;counter
!Character.isDigit(s2.charAt(counter));counter++);
String temp2 = s2.substring(counter);
s2 = s2.substring(0,counter);
int max = (temp1.length() > temp2.length()) ? temp1.length() : temp2.length();
char[] pad = new char[max-temp1.length()];
Arrays.fill(pad,(char)48);
temp1 = String.valueOf(pad) + temp1;
pad = new char[max-temp2.length()];
Arrays.fill(pad,(char)48);
temp2 = String.valueOf(pad) + temp2;
s1 = s1 + temp1;
s2 = s2 + temp2;
return(s1.compareTo(s2));
}
public boolean equals(Object o1,
Object o2) {
String s1 = o1.toString();
String s2 = o2.toString();
return(s1.equals(s2));
}
}
And finally,. the problem got resolved, i got my list ordered in alphabetical form.
