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Move articles out of java-strings part4

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This commit is contained in:
catalin-burcea
2019-10-29 14:54:28 +02:00
parent 994651a49f
commit ba50a42d43
55 changed files with 299 additions and 340 deletions
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2
java-strings/README.md
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@@ -3,10 +3,8 @@
This module contains articles about strings in Java.
### Relevant Articles:
- [String Operations with Java Streams](https://www.baeldung.com/java-stream-operations-on-strings)
- [Use char[] Array Over a String for Manipulating Passwords in Java?](https://www.baeldung.com/java-storing-passwords)
- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
- [String Performance Hints](https://www.baeldung.com/java-string-performance)
- [Adding a Newline Character to a String in Java](https://www.baeldung.com/java-string-newline)
- More articles: [[next -->]](/java-strings-2)

44
java-strings/src/main/java/com/baeldung/string/JoinerSplitter.java
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@@ -1,44 +0,0 @@
package com.baeldung.string;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class JoinerSplitter {
public static String join ( String[] arrayOfString ) {
return Arrays.asList(arrayOfString)
.stream()
.map(x -> x)
.collect(Collectors.joining(","));
}
public static String joinWithPrefixPostFix ( String[] arrayOfString ) {
return Arrays.asList(arrayOfString)
.stream()
.map(x -> x)
.collect(Collectors.joining(",","[","]"));
}
public static List<String> split ( String str ) {
return Stream.of(str.split(","))
.map (elem -> new String(elem))
.collect(Collectors.toList());
}
public static List<Character> splitToListOfChar ( String str ) {
return str.chars()
.mapToObj(item -> (char) item)
.collect(Collectors.toList());
}
public static Map<String, String> arrayToMap(String[] arrayOfString) {
return Arrays.asList(arrayOfString)
.stream()
.map(str -> str.split(":"))
.collect(Collectors.<String[], String, String>toMap(str -> str[0], str -> str[1]));
}
}

69
java-strings/src/main/java/com/baeldung/string/newline/AddingNewLineToString.java
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@@ -1,69 +0,0 @@
package com.baeldung.string.newline;
public class AddingNewLineToString {
public static void main(String[] args) {
String line1 = "Humpty Dumpty sat on a wall.";
String line2 = "Humpty Dumpty had a great fall.";
String rhyme = "";
System.out.println("***New Line in a String in Java***");
//1. Using "\n"
System.out.println("1. Using \\n");
rhyme = line1 + "\n" + line2;
System.out.println(rhyme);
//2. Using "\r\n"
System.out.println("2. Using \\r\\n");
rhyme = line1 + "\r\n" + line2;
System.out.println(rhyme);
//3. Using "\r"
System.out.println("3. Using \\r");
rhyme = line1 + "\r" + line2;
System.out.println(rhyme);
//4. Using "\n\r" Note that this is not same as "\r\n"
// Using "\n\r" is equivalent to adding two lines
System.out.println("4. Using \\n\\r");
rhyme = line1 + "\n\r" + line2;
System.out.println(rhyme);
//5. Using System.lineSeparator()
System.out.println("5. Using System.lineSeparator()");
rhyme = line1 + System.lineSeparator() + line2;
System.out.println(rhyme);
//6. Using System.getProperty("line.separator")
System.out.println("6. Using System.getProperty(\"line.separator\")");
rhyme = line1 + System.getProperty("line.separator") + line2;
System.out.println(rhyme);
System.out.println("***HTML to rendered in a browser***");
//1. Line break for HTML using <br>
System.out.println("1. Line break for HTML using <br>");
rhyme = line1 + "<br>" + line2;
System.out.println(rhyme);
//2. Line break for HTML using “&#10;”
System.out.println("2. Line break for HTML using &#10;");
rhyme = line1 + "&#10;" + line2;
System.out.println(rhyme);
//3. Line break for HTML using “&#13;”
System.out.println("3. Line break for HTML using &#13;");
rhyme = line1 + "&#13;" + line2;
System.out.println(rhyme);
//4. Line break for HTML using “&#10&#13;;”
System.out.println("4. Line break for HTML using &#10;&#13;");
rhyme = line1 + "&#10;&#13;" + line2;
System.out.println(rhyme);
//5. Line break for HTML using \n”
System.out.println("5. Line break for HTML using \\n");
rhyme = line1 + "\n" + line2;
System.out.println(rhyme);
}
}

83
java-strings/src/test/java/com/baeldung/string/JoinerSplitterUnitTest.java
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@@ -1,83 +0,0 @@
package com.baeldung.string;
import org.junit.Test;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.junit.Assert.assertEquals;
public class JoinerSplitterUnitTest {
@Test
public void provided_array_convert_to_stream_and_convert_to_string() {
String[] programming_languages = {"java", "python", "nodejs", "ruby"};
String expectation = "java,python,nodejs,ruby";
String result = JoinerSplitter.join(programming_languages);
assertEquals(result, expectation);
}
@Test
public void givenArray_transformedToStream_convertToPrefixPostfixString() {
String[] programming_languages = {"java", "python",
"nodejs", "ruby"};
String expectation = "[java,python,nodejs,ruby]";
String result = JoinerSplitter.joinWithPrefixPostFix(programming_languages);
assertEquals(result, expectation);
}
@Test
public void givenString_transformedToStream_convertToList() {
String programming_languages = "java,python,nodejs,ruby";
List<String> expectation = new ArrayList<String>();
expectation.add("java");
expectation.add("python");
expectation.add("nodejs");
expectation.add("ruby");
List<String> result = JoinerSplitter.split(programming_languages);
assertEquals(result, expectation);
}
@Test
public void givenString_transformedToStream_convertToListOfChar() {
String programming_languages = "java,python,nodejs,ruby";
List<Character> expectation = new ArrayList<Character>();
char[] charArray = programming_languages.toCharArray();
for (char c : charArray) {
expectation.add(c);
}
List<Character> result = JoinerSplitter.splitToListOfChar(programming_languages);
assertEquals(result, expectation);
}
@Test
public void givenStringArray_transformedToStream_convertToMap() {
String[] programming_languages = new String[] {"language:java","os:linux","editor:emacs"};
Map<String,String> expectation=new HashMap<>();
expectation.put("language", "java");
expectation.put("os", "linux");
expectation.put("editor", "emacs");
Map<String, String> result = JoinerSplitter.arrayToMap(programming_languages);
assertEquals(result, expectation);
}
}