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44 lines
1.1 KiB
44 lines
1.1 KiB
/**
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* 数学题目类，表示一道数学题
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*/
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public class MathProblem {
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private String expression; // 题目表达式
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private String answer; // 答案
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private String difficulty; // 难度级别
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public MathProblem(String expression, String answer, String difficulty) {
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this.expression = expression;
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this.answer = answer;
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this.difficulty = difficulty;
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}
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public String getExpression() {
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return expression;
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}
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public String getAnswer() {
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return answer;
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}
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public String getDifficulty() {
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return difficulty;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) return true;
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if (obj == null || getClass() != obj.getClass()) return false;
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MathProblem that = (MathProblem) obj;
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return expression.equals(that.expression);
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}
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@Override
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public int hashCode() {
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return expression.hashCode();
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}
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@Override
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public String toString() {
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return expression + " = ?";
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}
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} |