public final class Timestamp extends Object implements Serializable
public Timestamp(Date timestamp, CertPath signerCertPath)
timestamp - 是时间戳的日期和时间。 
            它不能为空。 
           signerCertPath - 是TSA的证书路径。 
            它不能为空。 
           NullPointerException - 如果timestamp或signerCertPath为空。 
           public Date getTimestamp()
public CertPath getSignerCertPath()
public int hashCode()
hashCode在 
            Object 
           Object.equals(java.lang.Object) , 
            System.identityHashCode(java.lang.Object) 
           public boolean equals(Object obj)
equals在 
            Object 
           obj - 用于测试与此时间戳相等的对象。 
           Object.hashCode() , HashMap 
            Submit a bug or feature 
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