added visitor pattern sample
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visitor/src/main/java/com/iluwatar/UnitVisitor.java
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9
visitor/src/main/java/com/iluwatar/UnitVisitor.java
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package com.iluwatar;
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public interface UnitVisitor {
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void visitSoldier(Soldier soldier);
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void visitSergeant(Sergeant sergeant);
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void visitCommander(Commander commander);
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}
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