import org.codelibs.core.exception.NoSuchMethodRuntimeException;

/**
 * Utility class for {@link Class} operations.
 *
 * @author higa
 */
public abstract class ClassUtil {

    /**
     * Do not instantiate.
     */
    protected ClassUtil() {
    }

    /** Map from wrapper types to primitive types */
    protected static final Map<Class<?>, Class<?>> wrapperToPrimitiveMap = newHashMap();

        assertThat(ClassUtil.concatName("aaa", null), is("aaa"));
        assertThat(ClassUtil.concatName("aaa", ""), is("aaa"));
        assertThat(ClassUtil.concatName(null, "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName("", "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName("", "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName(null, null), is(nullValue()));

import junit.textui.TestRunner;

import org.codelibs.core.io.TraversalUtil.FileSystemTraverser;
import org.codelibs.core.io.TraversalUtil.JarFileTraverser;
import org.codelibs.core.io.xxx.DummyTest;
import org.codelibs.core.lang.ClassUtil;
import org.junit.Test;

/**
 * @author koichik
 */
public class TraverserUtilTest {

    /**
     * @throws Exception
     */
    @Test

        final String path = ClassUtil.getPackageName(this.getClass()).replaceAll("\\.", "/") + "/aaa.html";
        final String contentType = MimeTypeUtil.guessContentType(path);
        assertEquals("text/html", contentType);
    }

    /**
     * @throws Exception
     */
    @Test
    public void testGetFromStream_gif() throws Exception {

        }

        subPackages.stream().forEach(protocol -> {
            try {
                final Class<Object> handlerClazz = ClassUtil.forName(basePackage + "." + protocol + ".Handler");
                final Field protocolTypeField = ClassUtil.getDeclaredField(handlerClazz, "PROTOCOL_TYPE");
                if (protocolTypeField.get(null) instanceof final String protocolType) {

import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.codelibs.core.jar.JarFileUtil;
import org.codelibs.core.lang.ClassLoaderUtil;
import org.codelibs.core.lang.ClassUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.log.Logger;
import org.codelibs.core.net.URLUtil;
import org.codelibs.core.zip.ZipFileUtil;
import org.codelibs.core.zip.ZipInputStreamUtil;

/**

import java.io.File;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import org.codelibs.core.lang.ClassUtil;
import org.codelibs.core.zip.ZipInputStreamUtil;

/**
 * Handler for traversing and processing classes.
 *
 * @author koichik
 * @see ClassHandler
 * @see TraversalUtil
 */

import java.util.function.Consumer;

import org.codelibs.core.beans.BeanDesc;
import org.codelibs.core.beans.PropertyDesc;
import org.codelibs.core.beans.factory.BeanDescFactory;
import org.codelibs.core.lang.ClassUtil;

/**
 * Utility for copying properties between JavaBeans or between JavaBeans and {@link Map}.
 * <p>
 * By specifying the source and destination JavaBeans, properties can be copied.
 * </p>
 *
 * <pre>

import org.codelibs.core.exception.FieldNotFoundRuntimeException;
import org.codelibs.core.exception.MethodNotFoundRuntimeException;
import org.codelibs.core.exception.PropertyNotFoundRuntimeException;
import org.codelibs.core.lang.ClassUtil;
import org.codelibs.core.lang.FieldUtil;
import org.codelibs.core.lang.StringUtil;

/**
 * Implementation class of {@link BeanDesc}.
 *
 * @author higa
 */
public class BeanDescImpl implements BeanDesc {

```

### Exception Handling
```java
import org.codelibs.core.exception.*;

// Runtime exception wrappers eliminate try-catch boilerplate
try {
    // Code that might throw checked exceptions
    return ClassUtil.newInstance(className); // Wraps checked exceptions automatically
} catch (ClassNotFoundRuntimeException e) {
    // Handle the wrapped exception
    logger.error("Class not found: " + className, e);
}
```