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[BAEL-9550] - Moved articles and codes from core-java-collections module to java-collections-convversions and java-collections-maps module

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amit2103
2018-10-20 00:37:31 +05:30
parent 5597bf69cd
commit 71793cef7f
34 changed files with 152 additions and 35 deletions
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java-collections-conversions/src/test/java/org/baeldung/java/collections/JavaCollectionConversionUnitTest.java
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package org.baeldung.java.collections;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.junit.Test;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.google.common.primitives.Ints;
@SuppressWarnings("unused")
public class JavaCollectionConversionUnitTest {
// List -> array; array -> List
@Test
public final void givenUsingCoreJava_whenArrayConvertedToList_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final List<Integer> targetList = Arrays.asList(sourceArray);
}
@Test
public final void givenUsingCoreJava_whenListConvertedToArray_thenCorrect() {
final List<Integer> sourceList = Arrays.asList(0, 1, 2, 3, 4, 5);
final Integer[] targetArray = sourceList.toArray(new Integer[sourceList.size()]);
}
@Test
public final void givenUsingGuava_whenArrayConvertedToList_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final List<Integer> targetList = Lists.newArrayList(sourceArray);
}
@Test
public final void givenUsingGuava_whenListConvertedToArray_thenCorrect() {
final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
final int[] targetArray = Ints.toArray(sourceList);
}
@Test
public final void givenUsingCommonsCollections_whenArrayConvertedToList_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final List<Integer> targetList = new ArrayList<>(6);
CollectionUtils.addAll(targetList, sourceArray);
}
// Set -> array; array -> Set
@Test
public final void givenUsingCoreJavaV1_whenArrayConvertedToSet_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final Set<Integer> targetSet = new HashSet<Integer>(Arrays.asList(sourceArray));
}
@Test
public final void givenUsingCoreJavaV2_whenArrayConvertedToSet_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final Set<Integer> targetSet = new HashSet<Integer>();
Collections.addAll(targetSet, sourceArray);
}
@Test
public final void givenUsingCoreJava_whenSetConvertedToArray_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final Integer[] targetArray = sourceSet.toArray(new Integer[sourceSet.size()]);
}
@Test
public final void givenUsingGuava_whenArrayConvertedToSet_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final Set<Integer> targetSet = Sets.newHashSet(sourceArray);
}
@Test
public final void givenUsingGuava_whenSetConvertedToArray_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final int[] targetArray = Ints.toArray(sourceSet);
}
@Test
public final void givenUsingCommonsCollections_whenArrayConvertedToSet_thenCorrect() {
final Integer[] sourceArray = { 0, 1, 2, 3, 4, 5 };
final Set<Integer> targetSet = new HashSet<>(6);
CollectionUtils.addAll(targetSet, sourceArray);
}
@Test
public final void givenUsingCommonsCollections_whenSetConvertedToArray_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final Integer[] targetArray = sourceSet.toArray(new Integer[sourceSet.size()]);
}
@Test
public final void givenUsingCommonsCollections_whenSetConvertedToArrayOfPrimitives_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final Integer[] targetArray = sourceSet.toArray(new Integer[sourceSet.size()]);
final int[] primitiveTargetArray = ArrayUtils.toPrimitive(targetArray);
}
// Set -> List; List -> Set
public final void givenUsingCoreJava_whenSetConvertedToList_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final List<Integer> targetList = new ArrayList<>(sourceSet);
}
public final void givenUsingCoreJava_whenListConvertedToSet_thenCorrect() {
final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
final Set<Integer> targetSet = new HashSet<>(sourceList);
}
public final void givenUsingGuava_whenSetConvertedToList_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final List<Integer> targetList = Lists.newArrayList(sourceSet);
}
public final void givenUsingGuava_whenListConvertedToSet_thenCorrect() {
final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
final Set<Integer> targetSet = Sets.newHashSet(sourceList);
}
public final void givenUsingCommonsCollections_whenListConvertedToSet_thenCorrect() {
final List<Integer> sourceList = Lists.newArrayList(0, 1, 2, 3, 4, 5);
final Set<Integer> targetSet = new HashSet<>(6);
CollectionUtils.addAll(targetSet, sourceList);
}
public final void givenUsingCommonsCollections_whenSetConvertedToList_thenCorrect() {
final Set<Integer> sourceSet = Sets.newHashSet(0, 1, 2, 3, 4, 5);
final List<Integer> targetList = new ArrayList<>(6);
CollectionUtils.addAll(targetList, sourceSet);
}
// Map (values) -> Array, List, Set
@Test
public final void givenUsingCoreJava_whenMapValuesConvertedToArray_thenCorrect() {
final Map<Integer, String> sourceMap = createMap();
final Collection<String> values = sourceMap.values();
final String[] targetArray = values.toArray(new String[values.size()]);
}
@Test
public final void givenUsingCoreJava_whenMapValuesConvertedToList_thenCorrect() {
final Map<Integer, String> sourceMap = createMap();
final List<String> targetList = new ArrayList<>(sourceMap.values());
}
@Test
public final void givenUsingGuava_whenMapValuesConvertedToList_thenCorrect() {
final Map<Integer, String> sourceMap = createMap();
final List<String> targetList = Lists.newArrayList(sourceMap.values());
}
@Test
public final void givenUsingCoreJava_whenMapValuesConvertedToSet_thenCorrect() {
final Map<Integer, String> sourceMap = createMap();
final Set<String> targetSet = new HashSet<>(sourceMap.values());
}
// UTIL
private final Map<Integer, String> createMap() {
final Map<Integer, String> sourceMap = new HashMap<>(3);
sourceMap.put(0, "zero");
sourceMap.put(1, "one");
sourceMap.put(2, "two");
return sourceMap;
}
}
java-collections-conversions/src/test/java/org/baeldung/java/lists/ListToSTring.java
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package org.baeldung.java.lists;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
public class ListToSTring {
@Test
public void whenListToString_thenPrintDefault() {
List<Integer> intLIst = Arrays.asList(1, 2, 3);
System.out.println(intLIst);
}
@Test
public void whenCollectorsJoining_thenPrintCustom() {
List<Integer> intList = Arrays.asList(1, 2, 3);
System.out.println(intList.stream()
.map(n -> String.valueOf(n))
.collect(Collectors.joining("-", "{", "}")));
}
@Test
public void whenStringUtilsJoin_thenPrintCustom() {
List<Integer> intList = Arrays.asList(1, 2, 3);
System.out.println(StringUtils.join(intList, "|"));
}
}