Sorting elements of a Collection
This section gives you the best illustration for
sorting elements of a Collection. You can see how to sort all elements of a
Collection in ascending or descending order.
In this section, the given program sorts all the
elements of a Collection in ascending order. If your text starts with the Upper
case letter then the text comes first that mean the uppercase letter is less
priority than lowercase letter.
Code Description:
This program creates an string type array and takes
some text as input from the user for the created array. Array with elements are
assigned to the List (Collection) and then all the elements of the list are
arranged in the ascending order.
Collections.sort(list):
Above method sorts all the elements of the
specified Collection. List name which elements have to be sorted is passed
through the method as a parameter. This method sorts elements in ascending order
by default.
Here is the code of the program:
import java.util.*;
import java.io.*;
public class SortingCollection{
public static void main(String[] args) throws IOException{
int n = 0;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("How many elements you want to enter in the list : ");
try{
n = Integer.parseInt(in.readLine());
}
catch(NumberFormatException ne){
System.out.println(ne.getMessage() + " is not a legal entry.");
System.out.println("Please enter a numeric value.");
System.exit(1);
}
String[] names = new String[n];
System.out.println("Please enter some names : ");
for(int i = 0; i < n; i++){
names[i] = in.readLine();
}
List<String> list = Arrays.asList(names);
Collections.sort(list);
System.out.print("Elements of the list in sorted order : " + list);
}
}
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