String name = "\"john\"";

You have to escape the second pair of quotation marks using the \ character in front. It might be worth looking at this link, which explains in some detail.

Other scenario where you set variable:

String name2 = "\""+name+"\"";

Sequence in console:

> String name = "\"john\"";
> name
""john""
> String name2 = "\""+name+"\"";
> name2
"""john"""

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