本文详细介绍了Java中的操作符使用方法，包括instanceof操作符用于测试对象类型，等号操作符（==和!=）用于比较对象引用或原始类型的值，位移操作符（>> 和 >>>）的功能区别，逻辑与和逻辑或操作符（&& 和 ||）的应用场景，以及类型转换等内容。
The instanceof opertor can be used only to test objects (or null) with class types that are in the same class hierarchy.
The equality operators (== and != ) compare reference variables when used on objects, and values when used on primitives.
The >> operator shifts to the right while keeping the sign bit. The >>> operator moves all bits to the right, including the sign bit.
The & and | operator are used for integer or boolean values only.
The && and || operators are used for boolean types only.
Floating-point numbers may be cast to integral types.
Larger number values may be cast to smaller types explicitly, and smaller types to lager ones implicitly.
Supperclass object references may be cast to subclass types explicitly.
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