*
 * @author higa
 * @param <V> the type of values
 */
public class CaseInsensitiveMap<V> extends ArrayMap<String, V> {

    private static final long serialVersionUID = 1L;

    /**
     * Creates a {@link CaseInsensitiveMap}.
     */
    public CaseInsensitiveMap() {
    }

    /**
     * Creates a {@link CaseInsensitiveMap}.
     *
     * @param capacity the initial capacity
     */

    static final long serialVersionUID = 0L;

    private transient Map<String, Object> map = new CaseInsensitiveMap<>();

    private static final Object PRESENT = new Object();

    /**
     * Creates a {@link CaseInsensitiveSet}.
     */
    public CaseInsensitiveSet() {
        map = new CaseInsensitiveMap<>();
    }

    /**
     * Creates a {@link CaseInsensitiveSet}.
     *

import org.junit.Before;
import org.junit.Test;

/**
 * @author higa
 */
public class CaseInsensitiveMapTest {

    CaseInsensitiveMap<String> map;

    /**
     * @throws Exception
     */
    @Before
    public void setUp() throws Exception {
        map = new CaseInsensitiveMap<String>();
        map.put("one", "1");
        map.put("two", "2");
    }

    /**
     * @throws Exception
     */

## Repository Structure

```
src/main/java/org/codelibs/core/
├── beans/       # Bean manipulation & introspection (converter/, factory/, impl/, util/)
├── collection/  # Enhanced collections (LruHashMap, CaseInsensitiveMap)
├── concurrent/  # Concurrency utilities
├── convert/     # Type conversion (*ConversionUtil)
├── crypto/      # Cipher & encryption (CachedCipher)
├── exception/   # Runtime exception wrappers

    /** Map of type arguments and type variables */
    protected final Map<TypeVariable<?>, Type> typeVariables;

    /** Map from property name to {@link PropertyDesc} */
    protected final CaseInsensitiveMap<PropertyDesc> propertyDescCache = new CaseInsensitiveMap<>();

    /** Map from field name to {@link FieldDescImpl} */
    protected final ArrayMap<String, FieldDesc> fieldDescCache = new ArrayMap<>();

    /** Array of {@link ConstructorDesc} */

SequencedCollection<String> reversed = CollectionsUtil.reversed(sequenced);

// Specialized collections
LruHashMap<String, Object> lruCache = new LruHashMap<>(100); // LRU cache with max 100 entries
CaseInsensitiveMap<String> configMap = new CaseInsensitiveMap<>();
```

### Resource Management
```java
import org.codelibs.core.io.*;

// Resource loading and management
URL resource = ResourceUtil.getResource("config.properties");