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MapToList.java
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66 lines (57 loc) · 2.77 KB
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package map;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class MapToList {
public static Map<Integer, String> map = new HashMap<>();
static {
map.put(10, "apple");
map.put(20, "orange");
map.put(30, "banana");
map.put(40, "watermelon");
map.put(50, "pinapple");
}
public static void main(String[] args) {
mapToList1();
mapToList2();
mapToList3();
}
private static void maptoListGeneral() {
Map<String, String> map = new HashMap<>();
List<String> list = new ArrayList(map.keySet());
List<String> list1 = new ArrayList(map.values());
List<String> list2 = map.keySet().stream().collect(Collectors.toList());
List<String> list3 = map.values().stream().collect(Collectors.toList());
List<String> list4 = map.values().stream().filter(x -> x.equalsIgnoreCase("a")).collect(Collectors.toList());
}
private static void mapToList1() {
List<Integer> result = new ArrayList(map.keySet());
List<String> result2 = new ArrayList(map.values());
List<Integer> result3 = map.keySet().stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList());
System.err.println("<------------------------------MapToList1------------------------------>");
result.forEach(System.out::println);
System.err.println("<------------------------------MapToList1------------------------------>");
result2.forEach(System.out::println);
System.err.println("<------------------------------MapToList1------------------------------>");
result3.forEach(System.out::println);
}
private static void mapToList2() {
List<Integer> result = map.keySet().stream().collect(Collectors.toList());
System.err.println("<------------------------------MapToList2------------------------------>");
result.forEach(System.out::println);
List<String> sortedList = map.values().stream().filter(x->x.contains("na")).collect(Collectors.toList());
System.err.println("<------------------------------MapToList2------------------------------>");
sortedList.forEach(System.out::println);
}
private static void mapToList3() {
List<Integer> resultSortedKey = new ArrayList<>();
List<String> result = map.entrySet().stream().sorted(Map.Entry.<Integer,String>comparingByKey().reversed()).peek(e -> resultSortedKey.add(e.getKey())).map(x->x.getValue()).filter(x->!x.equalsIgnoreCase("banana")).collect(Collectors.toList());
System.err.println("<------------------------------MapToList3------------------------------>");
result.forEach(System.out::println);
System.err.println("<------------------------------MapToList3------------------------------>");
resultSortedKey.forEach(System.out::println);
}
}