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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.bean.copier;

import cn.hutool.core.lang.copier.Copier;
import cn.hutool.core.util.ObjectUtil;

/**
 * 抽象的对象拷贝封装，提供来源对象、目标对象持有
 *
 * @param  来源对象类型
 * @param  目标对象类型
 * @author looly
 * @since 5.8.0
 */
public abstract class AbsCopier implements Copier {

	protected final S source;
	protected final T target;
	/**
	 * 拷贝选项
	 */
	protected final CopyOptions copyOptions;

	public AbsCopier(S source, T target, CopyOptions copyOptions) {
		this.source = source;
		this.target = target;
		this.copyOptions = ObjectUtil.defaultIfNull(copyOptions, CopyOptions::create);
	}
}