Execution tag fix
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// Visit http://OnJava8.com for more book information.
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// Visit http://OnJava8.com for more book information.
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// Demonstration of Observer pattern using
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// Demonstration of Observer pattern using
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// Java's built-in observer classes
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// Java's built-in observer classes
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// {java patterns.visualobserver.BoxObserver}
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package patterns.visualobserver;
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package patterns.visualobserver;
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import javax.swing.*;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.*;
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