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答え……(for id:yurli)

public class sample1 {

    public static void main(String[] args) throws Exception {
        try {
            InputStreamReader is = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(is);

            Random rnd = new Random();

            int target = rnd.nextInt(101);

            System.out.print("数字当て(0-100) = ?");
            String strA = br.readLine();

            int ges = Integer.parseInt(strA);

            while (ges != target) {

                if (ges > target) {
                    System.out.println("もっと小さい");
                } else if (ges < target) {
                    System.out.println("もっと大きい");
                }
                System.out.print("数字当て(0-100) = ?");
                strA = br.readLine();

                ges = Integer.parseInt(strA);

            }
            System.out.println("あたり");
        } catch (Exception e) {
            e.printStackTrace();
            throw (e);
        }

    }
}

みたいな感じ。