java - Using "or" statements with strings in an if statement -

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so want make code categorizes words match phrase. catstring string inputted user. want execute rest of code if input fire or smoke.

here's line i'm having trouble with:

if(catstring = "fire" || "smoke" );

you need repeat catstring =. however, should not using == (not =, assignment operator) compare strings. use .equals(). like:

if(catstring.equals("fire") || catstring.equals("smoke"));

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