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Printf()method works

 
Greenhorn
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Hello all,
I want to ask one question.This question is just like

and It prints 1213%1$s.How this result get.I don't understand.Please explain me.Thank so much.
 
Bartender
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This question has been asked several times on the Ranch.

An example.
https://coderanch.com/t/658590/java-programmer-OCPJP/certification/System-println

Please use the search feature.
 
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