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This compliant solution exports a public static factory method getInstance() that creates and returns a copy of a given MutableClass object instance.

Code Block

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public final class MutableClass {
  private final Date date;
	
  publicprivate MutableClass(Date d) {
    this.date = new Date(d.getTime());  // Copy-in   
  }
 
  public Date getDate() {
    return (Date)date.clone(); // Copy and return
  }

  public static MutableClass getInstance(MutableClass mc)  {
    return new MutableClass(mc.getDate());
  }
}

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