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BAEL-2682: Move java-immutable-set article to core-java-collections-set module (#9001)

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kwoyke
2020-04-01 20:42:54 +02:00
committed by GitHub
parent 0448d52279
commit 413e426c8e
4 changed files with 5 additions and 4 deletions
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44
core-java-modules/core-java-9/src/main/java/com/baeldung/java9/set/UnmodifiableSet.java
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@@ -1,44 +0,0 @@
package com.baeldung.java9.set;
import com.google.common.collect.ImmutableSet;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
public class UnmodifiableSet {
public static void main(String[] args) {
Set<String> set = new HashSet<>();
set.add("Canada");
set.add("USA");
coreJDK(set);
guavaOf();
copyOf(set);
java9Of();
}
private static void java9Of() {
Set<String> immutable = Set.of("Canada", "USA");
System.out.println(immutable);
}
private static void guavaOf() {
Set<String> immutable = ImmutableSet.of("Canada", "USA");
System.out.println(immutable);
}
private static void copyOf(Set<String> set) {
Set<String> immutable = ImmutableSet.copyOf(set);
set.add("Costa Rica");
System.out.println(immutable);
}
private static void coreJDK(Set<String> set) {
Set<String> unmodifiableSet = Collections.unmodifiableSet(set);
set.add("Costa Rica");
System.out.println(unmodifiableSet);
}
}

38
core-java-modules/core-java-9/src/test/java/com/baeldung/java9/SetExamplesUnitTest.java
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@@ -1,38 +0,0 @@
package com.baeldung.java9;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class SetExamplesUnitTest {
@Test
public void testUnmutableSet() {
Set<String> strKeySet = Set.of("key1", "key2", "key3");
try {
strKeySet.add("newKey");
} catch (UnsupportedOperationException uoe) {
}
assertEquals(strKeySet.size(), 3);
}
@Test
public void testArrayToSet() {
Integer[] intArray = new Integer[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
Set<Integer> intSet = Set.of(intArray);
assertEquals(intSet.size(), intArray.length);
}
@Test(expected = UnsupportedOperationException.class)
public void testUnmodifiableSet() {
Set<String> set = new HashSet<>();
set.add("Canada");
set.add("USA");
Set<String> unmodifiableSet = Collections.unmodifiableSet(set);
unmodifiableSet.add("Costa Rica");
}
}