add new groupBy cases

This commit is contained in:
Roman Ivanov
2017-09-13 11:29:31 +07:00
parent 0752af3706
commit 364c5bb129
9 changed files with 497 additions and 375 deletions

View File

@@ -0,0 +1,14 @@
// "Replace with collect" "true"
import java.util.*;
import java.util.stream.Collectors;
public class Main {
private Map<Integer, List<String>> test(String... list) {
Map<Integer, List<String>> map = Arrays.stream(list).filter(Objects::nonNull).collect(Collectors.groupingBy(String::length));
return map;
}
public static void main(String[] args) {
System.out.println(new Main().test("a", "bbb", null, "cc", "dd", "eedasfasdfs", "dd"));
}
}

View File

@@ -4,9 +4,8 @@ import java.util.stream.Collectors;
public class Main {
private Map<Integer, List<String>> test(String... list) {
Map<Integer, List<String>> map = new HashMap<>();
map = Arrays.stream(list).filter(Objects::nonNull).collect(Collectors.groupingBy(String::length, Collectors.toCollection(ArrayList::new)));
return map;
Map<Integer, List<String>> map = Arrays.stream(list).filter(Objects::nonNull).collect(Collectors.groupingBy(String::length));
return map;
}
public static void main(String[] args) {

View File

@@ -0,0 +1,14 @@
// "Replace with collect" "true"
import java.util.*;
import java.util.stream.Collectors;
public class Main {
Map<Integer, List<String>> test(List<String> list) {
Map<Integer, List<String>> map = list.stream().collect(Collectors.groupingBy(String::length));
return map;
}
public static void main(String[] args) {
System.out.println(new Main().test("a", "bbb", null, "cc", "dd", "eedasfasdfs", "dd"));
}
}

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@@ -0,0 +1,20 @@
// "Replace with collect" "true"
import java.util.*;
public class Main {
private Map<Integer, List<String>> test(String... list) {
Map<Integer, List<String>> map = new HashMap<>();
for(String s : li<caret>st) {
if(s != null) {
List<String> tmp = map.get(s.length());
if(tmp == null) map.put(s.length(), tmp = new ArrayList<>());
tmp.add(s);
}
}
return map;
}
public static void main(String[] args) {
System.out.println(new Main().test("a", "bbb", null, "cc", "dd", "eedasfasdfs", "dd"));
}
}

View File

@@ -0,0 +1,17 @@
// "Replace with collect" "true"
import java.util.*;
public class Main {
Map<Integer, List<String>> test(List<String> list) {
Map<Integer, List<String>> map = new HashMap<>();
for<caret> (String s : list) {
List<String> strings = map.computeIfAbsent(s.length(), k -> new ArrayList<>());
strings.add(s);
}
return map;
}
public static void main(String[] args) {
System.out.println(new Main().test("a", "bbb", null, "cc", "dd", "eedasfasdfs", "dd"));
}
}