Strings constants with the same value are guaranteed by the VM specification to use the same instance.

具有相同值的字符串常量是由 VM 规范保证使用同一个实例的。

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The EJB specification states that the key must be a unique value represented by a serializable object.

EJB规范规定：主键必须是一个可序列化的对象所表示的独一无二的值。

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The JAX-RS specification puts a lot of value into HTTP and URIs but leaves a lot of space for hypermedia constraints.

JAX - RS规范充分肯定了HTTP和URI的价值，但是对超媒体约束却很大程度上有所保留。

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