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public final class MutableClass {
  private Date d;
	
  public mutableClassMutableClass(Date d) {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
      //check permissions
    }
    this.d = d;
  }
	
  public Date getDate() {
    return this.d;	
  }
}

public final class CloneClass implements Cloneable {
  private Date d;
	
  public cloneClassCloneClass(Date d) {
    SecurityManager sm = System.getSecurityManager();
      if (sm != null) {
	//check permissions
      }
      this.d = new Date(d.getTime());  //copy-in 
  }

  public Object clone() throws CloneNotSupportedException {
    SecurityManager sm = System.getSecurityManager();
    if (sm != null) {
      //check permissions
    }
    final cloneClassCloneClass cloned = (cloneClassCloneClass)super.clone();
    cloned.d = new Date( (Date)this.d.getTimeclone() );  //copy mutable Date object
    return cloned;
  }
	
  public Date getDate() {
    return new Date(this.d.getTime()); //copy and return
  }
}