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ConvertListToMap.java
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61 lines (50 loc) · 1.96 KB
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package map;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import dataclasses.Hosting;
public class ConvertListToMap {
public static List<Hosting> list = new ArrayList<Hosting>();
static {
list.add(new Hosting(1, "liquidweb.com", 80000));
list.add(new Hosting(2, "linode.com", 90000));
list.add(new Hosting(3, "digitalocean.com", 120000));
list.add(new Hosting(4, "aws.amazon.com", 200000));
list.add(new Hosting(5, "mkyong.com", 1));
}
public static void main(String[] args) {
listToMap();
duplicatedKey();
sortAndCollect();
}
public static void listToMap() {
Map<Integer, String> resut1 = list.stream().collect(Collectors.toMap(Hosting::getId, Hosting::getName));
print(resut1);
Map<String, Long> result2 = list.stream().collect(Collectors.toMap(Hosting::getName, Hosting::getWebsites));
print(result2);
Map<String, Integer> result3 = list.stream().collect(Collectors.toMap(x -> x.getName(), x -> x.getId()));
print(result3);
}
public static void duplicatedKey() {
list.add(new Hosting(6, "linode.com", 100000)); // new line
//oldVal<>newVal deðiþebilir
Map<String,Long> result1 = list.stream().collect(Collectors.toMap(Hosting::getName,Hosting::getWebsites, (oldVal,newVal)-> oldVal));
print(result1);
}
public static void sortAndCollect() {
Map result = list.stream().sorted(Comparator.comparingLong(Hosting::getWebsites).reversed()).collect(Collectors.toMap(
Hosting::getName,Hosting::getWebsites,(oldVal,newVal) -> oldVal,LinkedHashMap::new
));
print(result);
}
private static void print(Map list) {
list.forEach((k,v)->{
System.out.println(k + " " + v);
});
System.out.println("<------------------------------------>");
}
}