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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"
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‎core-java-modules/core-java-collections-maps-7/README.md‎

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## Relevant Articles

‎core-java-modules/core-java-collections-maps-7/pom.xml‎

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

‎core-java-modules/core-java-collections-maps-7/src/main/java/com/baeldung/map/ConvertHashMapStringToHashMapObjectUsingtoString.java‎

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

‎core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/ConvertHashMapStringToHashMapObjectUsingtoStringUnitTest.java‎

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

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