Using non-final variables to lock can cause thread-safety problems.According to my understanding, it is appropriate to add the final keyword here
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@ -24,7 +24,7 @@ public class DateUtil {
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private static final String DATE_FORMAT = "yyyy-MM-dd";
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private static final String DATE_FORMAT = "yyyy-MM-dd";
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private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
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private static final String DATETIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
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private static ThreadLocal<Map<String, DateFormat>> dateFormatThreadLocal = new ThreadLocal<Map<String, DateFormat>>();
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private static final ThreadLocal<Map<String, DateFormat>> dateFormatThreadLocal = new ThreadLocal<Map<String, DateFormat>>();
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private static DateFormat getDateFormat(String pattern) {
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private static DateFormat getDateFormat(String pattern) {
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if (pattern==null || pattern.trim().length()==0) {
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if (pattern==null || pattern.trim().length()==0) {
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throw new IllegalArgumentException("pattern cannot be empty.");
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throw new IllegalArgumentException("pattern cannot be empty.");
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