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public class Originator implements Cloneable{
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private Originator backup；
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//内部状态
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private String state=””；
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public String getState（）{
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return state；
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}
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public void setState（String state）{
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this.state=state；
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}
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//创建一个备忘录
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public void createMemento（）{
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this.backup=this.clone（）；
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}
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//恢复一个备忘录
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public void restoreMemento（）{
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//在进行恢复前应该进行断言，防止空指针
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this.setState（this.backup.getState（））；
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}
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//克隆当前对象
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@Override
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protected Originator clone（）{
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try{
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return（Originator）super.clone（）；
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}catch（CloneNotSupportedException e）{
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