/**
* @author lautturi.com
* Java example: sort a list/arraylist in java using stream
*/
import java.util.*;
import java.util.stream.Collectors;
public class Lautturi {
public static void main(String[] args) {
List<String> list = Arrays.asList(
"hello","lautturi","java","python","world","lau","perl","js");
List<String> sorted = list.stream().sorted((o1,o2)-> o1.compareTo(o2)).collect(Collectors.toList());
// List<String> sorted = list.stream().sorted().collect(Collectors.toList());
// List<String> sorted = list.stream().sorted((o1,o2)-> o1.length() - o2.length() ).collect(Collectors.toList()); // order by length of string
// List<String> sorted = list.stream().sorted((o1,o2)-> o2.compareTo(o1)).collect(Collectors.toList()); // sort list in decreasing/descending/reverse order
System.out.println("list:"+list);
System.out.println("sorted list:"+sorted);
}
}
output:
original list:[hello, lautturi, java, python, world, lau, perl, js] sorted list:[hello, java, js, lau, lautturi, perl, python, world]
/**
* @author lautturi.com
* Java example:
*/
import java.util.*;
import java.util.stream.Collectors;
public class Lautturi {
public static void main(String[] args) {
List<String> list = Arrays.asList(
"hello","lautturi","java","python","world","lau","perl","js");
System.out.println("original list:"+list);
Collections.sort(list); //acsending order by default
// Collections.sort(list, Collections.reverseOrder()); // decreasing/descending/reverse order
// Collections.sort(list, (a, b) -> a.compareToIgnoreCase(b)); // sort ignore the char case of string
System.out.println("sorted list:"+list);
}
}
output:
original list:[hello, lautturi, java, python, world, lau, perl, js] sorted list:[hello, java, js, lau, lautturi, perl, python, world]