package mathlearning.service.QuestionGenerator; public class middleGenerator extends QuestionGenerator{ public middleGenerator() { super("初中"); } @Override public String generateQuestion() { int operandCount = random.nextInt(4) + 2; // 生成操作数 int[] operands = new int [ operandCount ]; for (int i = 0; i < operandCount; i++) { operands[i] = random.nextInt(100) + 1; // 1-100 } String question = preForOper(operands); question = add_squs(question); return addParen(question); } }