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style: enable HideUtilityClassConstructor in checkstyle (#5147)
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@@ -4,7 +4,9 @@ import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Scanner;
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class KeithNumber {
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final class KeithNumber {
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private KeithNumber() {
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}
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// user-defined function that checks if the given number is Keith or not
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static boolean isKeith(int x) {
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