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String nullabity check duel...
null, isEmpty(), "", " ", '', ' ', " null", boolean, NaN, undefined, isNullOrEmpty and finally try-catch

undefined

java

String nullabity check duel... null, isEmpty(), "", " ", '', ' ', " null", boolean, NaN, undefined, isNullOrEmpty and finally try-catch

undefined

javascript

java

String nullabity check duel...
null, isEmpty(), "", " ", '', ' ', " null", boolean, NaN, undefined, isNullOrEmpty and finally try-catch