java_upgrade/src/main/java/sorting/SortStrings.java at master · amhtech/java_upgrade · GitHub

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package sorting;

import java.util.Arrays;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import java.util.stream.Collectors;

public class SortStrings {

public static void main(String[] args) {

List<String> strings = Arrays.asList("this", "is", "a", "list", "of", "strings");

System.out.println(strings);

System.out.println("Natural sort:");

Collections.sort(strings);

System.out.println(strings);

System.out.println("Sort by length using a Comparator impl anon inner class:");

Collections.sort(strings, new Comparator<String>() {

@Override

public int compare(String s1, String s2) {

return s1.length() - s2.length();

}

});

System.out.println(strings);

System.out.println("Reverse sort by length with a Comparator impl lambda expression:");

Collections.sort(strings, (s1, s2) -> s2.length() - s1.length());

System.out.println(strings);

// Stream has a sorted() method that is not destructive

System.out.println("Natural sort using Stream.sorted()");

List<String> sorted = strings.stream()

.sorted()

.collect(Collectors.toList());

System.out.println(sorted);

System.out.println("Reverse length sort using Stream.sorted(Comparator)");

sorted = strings.stream()

.sorted((s1, s2) -> s2.length() - s1.length())

.collect(Collectors.toList());

System.out.println(sorted);

System.out.println("Sort by length using Comparator.comparingInt()");

sorted = strings.stream()

.sorted(Comparator.comparingInt(String::length))

.collect(Collectors.toList());

System.out.println(sorted);

System.out.println("Sort by length, then equal lengths reverse alpha");

sorted = strings.stream()

.sorted(Comparator.comparingInt(String::length)

.thenComparing(Comparator.reverseOrder()))

.collect(Collectors.toList());

System.out.println(sorted);

}

java_upgrade/src/main/java/sorting/SortStrings.java at master · amhtech/java_upgrade · GitHub

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