java - 性能 Boolean.ValueOf 与 new Boolean(request.getParameter ("value"))

Question

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Answer 1

boolean 构造函数的文档说:

 * <p><b>Note: It is rarely appropriate to use this constructor.
 * Unless a <i>new</i> instance is required, the static factory
 * {@link #valueOf(boolean)} is generally a better choice. It is
 * likely to yield significantly better space and time performance.</b>

valueOf 返回对常量值的引用，因此不会创建新对象。