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import java.util.Random;
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/**
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* 题目生成器接口
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*/
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public interface QuestionGenerator {
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/**
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* 生成单个题目
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* @param operands 操作数数组
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* @param random 随机数生成器
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* @return 生成的题目
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*/
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String generateQuestion(int[] operands, Random random);
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}
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