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This commit related to the article BAEL-6877 (#14899) 

This commit aims to add a new Java module "core-java-collections-maps-7"
This commit is contained in:
Mo Helmy 2023-10-07 15:53:38 +03:00 committed by GitHub
parent ed2f3234e6
commit e62aba145b
4 changed files with 170 additions and 0 deletions
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1
core-java-modules/core-java-collections-maps-7/README.md Normal file
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## Relevant Articles

78
core-java-modules/core-java-collections-maps-7/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-maps-7</artifactId>
<name>core-java-collections-maps-7</name>
<packaging>jar</packaging>
<parent>
<artifactId>core-java-modules</artifactId>
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<properties>
<spring.version>5.2.5.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.4</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>1.36</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.9</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20230227</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>

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core-java-modules/core-java-collections-maps-7/src/main/java/com/baeldung/map/ConvertHashMapStringToHashMapObjectUsingtoString.java Normal file
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package com.baeldung.map;
import java.util.HashMap;
import java.util.Map;
public class ConvertHashMapStringToHashMapObjectUsingtoString {
public String name;
public int age;
public ConvertHashMapStringToHashMapObjectUsingtoString(String name, int age) {
this.name = name;
this.age = age;
}
public static ConvertHashMapStringToHashMapObjectUsingtoString deserializeCustomObject(String valueString) {
if (valueString.startsWith("{") && valueString.endsWith("}")) {
valueString = valueString.substring(1, valueString.length() - 1);
String[] parts = valueString.split(",");
String name = null;
int age = -1;
for (String part : parts) {
String[] keyValue = part.split("=");
if (keyValue.length == 2) {
String key = keyValue[0].trim();
String val = keyValue[1].trim();
if (key.equals("name")) {
name = val;
} else if (key.equals("age")) {
age = Integer.parseInt(val);
}
}
}
if (name != null && age >= 0) {
return new ConvertHashMapStringToHashMapObjectUsingtoString(name, age);
}
}
return new ConvertHashMapStringToHashMapObjectUsingtoString("", -1);
}
public static void main(String[] args) {
String hashMapString = "{key1={name=John, age=30}, key2={name=Alice, age=25}}";
String keyValuePairs = hashMapString.replaceAll("[{}\\s]", "");
String[] pairs = keyValuePairs.split(",");
Map<String, ConvertHashMapStringToHashMapObjectUsingtoString> actualHashMap = new HashMap<>();
for (String pair : pairs) {
String[] keyValue = pair.split("=");
if (keyValue.length == 2) {
String key = keyValue[0];
ConvertHashMapStringToHashMapObjectUsingtoString value = deserializeCustomObject(keyValue[1]);
actualHashMap.put(key, value);
}
}
System.out.println(actualHashMap);
}
@Override
public String toString() {
return "{name=" + name + ", age=" + age + "}";
}
}

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core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/ConvertHashMapStringToHashMapObjectUsingtoStringUnitTest.java Normal file
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package com.baeldung.map;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
class ConvertHashMapStringToHashMapObjectUsingtoStringUnitTest {
@Test
void givenValidCustomObject_whenSerializing_thenSerializedStringIsCorrect() {
ConvertHashMapStringToHashMapObjectUsingtoString customObject = new ConvertHashMapStringToHashMapObjectUsingtoString("John", 30);
String expectedSerializedString = "{name=John, age=30}";
assertEquals(expectedSerializedString, customObject.toString());
}
@Test
void givenValidSerializedString_whenDeserializing_thenCustomObjectIsCorrect() {
String serializedString = "{name=Alice, age=25}";
ConvertHashMapStringToHashMapObjectUsingtoString customObject = ConvertHashMapStringToHashMapObjectUsingtoString.deserializeCustomObject(serializedString);
assertEquals("Alice", customObject.name);
assertEquals(25, customObject.age);
}
@Test
void givenInvalidSerializedString_whenDeserializing_thenDefaultCustomObjectIsCreated() {
String invalidSerializedString = "{invalidString}";
ConvertHashMapStringToHashMapObjectUsingtoString customObject = ConvertHashMapStringToHashMapObjectUsingtoString.deserializeCustomObject(invalidSerializedString);
assertEquals("", customObject.name);
assertEquals(-1, customObject.age);
}
}