Question: Stack S = new Stack ( ) ; S . push ( new Integer ( 3 ) ) ; Integer X = S . pop

Stack S = new Stack() ;
S. push (new Integer (3));
Integer X = S.pop() ;
S.push (new Integer (7));
S.push (new Integer (5));
Integer Y = S.peek();
S.push (new Integer (9)) ;
Integer Z = S.pop();

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