자바 문서 주석 용법+자바 Doc 사용 설명

package org.springframework.util;
/**
 * Miscellaneous {@link String} utility methods.
 *
 * <p>Mainly for internal use within the framework; consider
 * <a href="http://commons.apache.org/proper/commons-lang/" rel="external nofollow"  rel="external nofollow" >Apache's Commons Lang</a>
 * for a more comprehensive suite of {@code String} utilities.
 *
 * <p>This class delivers some simple functionality that should really be
 * provided by the core Java {@link String} and {@link StringBuilder}
 * classes. It also provides easy-to-use methods to convert between
 * delimited strings, such as CSV strings, and collections and arrays.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rob Harrop
 * @author Rick Evans
 * @author Arjen Poutsma
 * @author Sam Brannen
 * @author Brian Clozel
 * @since 16 April 2001
 */
public abstract class StringUtils {}

package java.util;
/**
 * @param <E> the type of elements in this list
 *
 */
public interface List<E> extends Collection<E> {}

//      
@author Rod Johnson
//      ，  
@author Igor Hersht, [email protected]
//            
@author <a href="mailto:[email protected]" rel="external nofollow" >Ovidiu Predescu</a>
//      
@author [email protected]
//       
@author Apache Software Foundation
//              
@author <a href="https://jakarta.apache.org/turbine" rel="external nofollow" > Apache Jakarta Turbine</a>

/**
 * @see IntStream
 * @see LongStream
 * @see DoubleStream
 * @see <a href="package-summary.html" rel="external nofollow" >java.util.stream</a>
 * /
public interface Stream<T> extends BaseStream<T, Stream<T>> {}

package java.util.stream;
/**
* @since 1.8
*/
public interface Stream<T> extends BaseStream<T, Stream<T>> {}

package org.springframework.util;
/**
* @since 16 April 2001
*/
public abstract class StringUtils {}

 package com.sun.org.apache.xml.internal.resolver;
 /**
 * @version 1.0
 */
public class CatalogManager {}

/**
 * Check that the given {@code CharSequence} is neither {@code null} nor
 * of length 0.
 * <p>Note: this method returns {@code true} for a {@code CharSequence}
 * that purely consists of whitespace.
 * <p><pre class="code">
 * StringUtils.hasLength(null) = false
 * StringUtils.hasLength("") = false
 * StringUtils.hasLength(" ") = true
 * StringUtils.hasLength("Hello") = true
 * </pre>
 * @param str the {@code CharSequence} to check (may be {@code null})
 * @return {@code true} if the {@code CharSequence} is not {@code null} and has length
 * @see #hasText(String)
 */
public static boolean hasLength(@Nullable CharSequence str) {
	return (str != null && str.length() > 0);
}

<pre>{@code
     Person[] men = people.stream()
                        .filter(p -> p.getGender() == MALE)
                        .toArray(Person[]::new);
}</pre>

/**
 * @param str the {@code CharSequence} to check (may be {@code null})
 */
public static boolean hasText(@Nullable CharSequence str) {
 return (str != null && str.length() > 0 && containsText(str));
}

/**
 * @return {@code true} if the {@code CharSequence} is not {@code null},
 * its length is greater than 0, and it does not contain whitespace only
 */
public static boolean hasText(@Nullable CharSequence str) {
 return (str != null && str.length() > 0 && containsText(str));
}

/**
 * @throws IllegalArgumentException when the given source contains invalid encoded sequences
 */
public static String uriDecode(String source, Charset charset) {}

package com.sun.jmx.remote.security;
/**
 * @exception LoginException if the logout fails.
 */
public boolean logout() throws LoginException {}

/**
* @deprecated as of 5.0.4, in favor of {@link Locale#toLanguageTag()}
*/
@Deprecated
public static String toLanguageTag(Locale locale) {
return locale.getLanguage() + (hasText(locale.getCountry()) ? "-" + locale.getCountry() : "");
}

/**
* @see java.net.URLDecoder#decode(String, String)
*/
public static String uriDecode(String source, Charset charset) {}

/**      {@value} */
private static final Integer QUANTITY = 1;

package org.springframework.util;
/**
 * Miscellaneous {@link String} utility methods.
 *
 * <p>Mainly for internal use within the framework; consider
 * <a href="http://commons.apache.org/proper/commons-lang/" rel="external nofollow"  rel="external nofollow" >Apache's Commons Lang</a>
 * for a more comprehensive suite of {@code String} utilities.
 *
 * <p>This class delivers some simple functionality that should really be
 * provided by the core Java {@link String} and {@link StringBuilder}
 * classes. It also provides easy-to-use methods to convert between
 * delimited strings, such as CSV strings, and collections and arrays.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rob Harrop
 * @author Rick Evans
 * @author Arjen Poutsma
 * @author Sam Brannen
 * @author Brian Clozel
 * @since 16 April 2001
 */
public abstract class StringUtils {
	/**
	 * Check that the given {@code CharSequence} is neither {@code null} nor
	 * of length 0.
	 * <p>Note: this method returns {@code true} for a {@code CharSequence}
	 * that purely consists of whitespace.
	 * <p><pre class="code">
	 * StringUtils.hasLength(null) = false
	 * StringUtils.hasLength("") = false
	 * StringUtils.hasLength(" ") = true
	 * StringUtils.hasLength("Hello") = true
	 * </pre>
	 * @param str the {@code CharSequence} to check (may be {@code null})
	 * @return {@code true} if the {@code CharSequence} is not {@code null} and has length
	 * @see #hasText(String)
	 */
	public static boolean hasLength(@Nullable CharSequence str) {
		return (str != null && str.length() > 0);
	}
}

package com.example.javadocdemo;
import java.math.BigDecimal;
import java.util.Objects;
/**
 *   {@code OrderService}      .
 *
 * <p>          、    、        
 *
 * @see Order
 * @author <a href="mailto:[email protected]" rel="external nofollow" >Lerry Li</a>
 * @since 2019/05/06
 */
public class OrderService {
    /**      {@value} */
    private static final Integer QUANTITY = 1;
    /**
     *     .
     *
     * <p>          id     (  id     ).
     *
     * <pre>{@code
     *           
     *  List<Goods> items = new ArrayList<>();
     *  Goods goods = new Goods(1L, BigDecimal.ONE);
     *  Goods goods2 = new Goods(2L, BigDecimal.TEN);
     *  items.add(goods);
     *  items.add(goods2);
     *
     *  Order order1 = new Order();
     *  order.setUserId("1");
     *  order.setItems(items);
     *  OrderService#createOrder(order);
     * }
     * </pre>
     *
     * @param order     
     * @throws NullPointerException       
     * @exception IllegalArgumentException       
     * @return       
     * @version 1.0
     * @see Order
     */
    public boolean createOrder(Order order) throws IllegalArgumentException{
        Objects.requireNonNull(order);
        List<Goods> items = order.getItems();
        items.forEach(goods -> {
            BigDecimal quantity = goods.getQuantity();
            if (quantity == null || BigDecimal.ZERO.compareTo(quantity) == 0) {
                throw new IllegalArgumentException();
            }
        });
        System.out.println("create order...");
        return true;
    }
}