Code cleanup (#1461)
* Code cleanup * Fix flux tests * Fix checkstyle errors * Fix compile error
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@ -32,7 +32,7 @@ Given the army unit example from above, we first have the Unit and UnitVisitor b
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```java
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public abstract class Unit {
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private Unit[] children;
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private final Unit[] children;
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public Unit(Unit... children) {
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this.children = children;
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