can not resolve method setText(java.lang.String[])- Android Studio -

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i don't know why getting error in android studio, quite simple command executing. code provided below. appreciated. getting error in last line of code.

 string[] sadthought = {"a", "sad", "thought"};  string[] sadrandom ={(sadthought[new random().nextint(sadthought.length)])};      tvsad.settext(sadrandom);

simply use 

tvsad.settext(sadthought[new random().nextint(sadthought.length)]);

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