My-Spring-Test/Java-String/src/test/java/basics/StringImmutableTest.java at main · kkminseok/My-Spring-Test · GitHub

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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}
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packagebasics;

importorg.junit.jupiter.api.Test;

importjava.util.HashMap;
importjava.util.concurrent.ExecutorService;
importjava.util.concurrent.Executors;
importjava.util.concurrent.atomic.AtomicBoolean;

importstaticorg.junit.jupiter.api.Assertions.*;

publicclassStringImmutableTest {

@Test
publicvoid리터럴_String은_같은메모리를_참조한다() {
//given
Strings1 = "minseok";
Strings2 = "minseok";

//when

//then
assertTrue(s1 == s2);
 }

@Test
publicvoidString불변객체확인() {
//given
Strings1 = "minseok";

//when
changeStringToAlice(s1);

//then
assertTrue(s1.equals("minseok"));
 }

privatevoidchangeStringToAlice(Strings1) {
s1= "Alice";
 }

@Test
voidstringIsThreadSafe() {
// given
StringsharedString = "immutableString";
AtomicBooleanisConsistent = newAtomicBoolean(true);

// when
ExecutorServiceexecutorService = Executors.newFixedThreadPool(10);
for (inti = 0; i < 10; i++) {
executorService.execute(() -> {
// Simulate concurrent access
if (!sharedString.equals("immutableString")) {
isConsistent.set(false);
 }
 });
 }

// Shutdown the executor and wait for tasks to complete
executorService.shutdown();
while (!executorService.isTerminated()) {
// Wait for all threads to finish
 }

// then
assertTrue(isConsistent.get(), "String is not thread-safe!");

HashMap<String, String> immutableMap = newHashMap<>();
Stringkey = "immutableKey";
immutableMap.put(key, "immutableValue");

// Attempt to modify the key (not possible since String is immutable)
key = "modifiedKey";

System.out.println("Immutable Map Retrieval:");
System.out.println("Value for 'immutableKey': " + immutableMap.get("immutableKey")); // Works
 }

}