mindol1004/spring-boot-rest
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Idiomatic refactor (#2063)

Browse Source 
* StringToCharStream

* Spring integration tests

* Spring integration tests
This commit is contained in:
Grzegorz Piwowarek
2017-06-13 16:54:45 +02:00
committed by GitHub
parent 53f4ec5f87
commit fe11e8f7d4
4 changed files with 29 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
core-java/src/main/java/com/baeldung/string/StringToCharStream.java
View File

@@ -1,57 +1,34 @@
package com.baeldung.string;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
/**
* Created by smatt on 26/05/2017.
*/
public class StringToCharStream {
public StringToCharStream() {
//let's use the Stream API to manipulate a string
//this will count the occurrence of each character in the test string
private StringToCharStream() {
String testString = "tests";
//first get an IntStream
IntStream intStream = testString.chars();
IntStream intStream1 = testString.codePoints();
//now let's map them
Stream<Character> characterStream = intStream.mapToObj(c -> (char) c);
Stream<Character> characterStream1 = intStream1.mapToObj(c -> (char) c);
System.out.println("Counting Occurrence of Letter");
testString = "Noww";
//we don't want to use foreach, so . . .
Map<Character, Integer> map = new HashMap<>();
testString.codePoints()
.mapToObj(c -> (char) c)
.filter(c -> Character.isLetter(c))
.forEach(c -> {
if(map.containsKey(c)) {
map.put(c, map.get(c) + 1);
} else {
map.put(c, 1);
}
});
Map<Character, Integer> map = "Noww".codePoints()
.mapToObj(c -> (char) c)
.filter(Character::isLetter)
.collect(Collectors.toMap(c -> c, c -> 1, Integer::sum));
//printing out the result here
System.out.println(map.toString());
}
public static void main(String [] args) {
public static void main(String[] args) {
new StringToCharStream();
}
}