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package com.mathapp.models;
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/**
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* 代表四则运算的枚举类型。
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*/
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public enum Operator {
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ADD("+"),
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SUBTRACT("-"),
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MULTIPLY("*"),
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DIVIDE("/");
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private final String symbol;
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Operator(String symbol) {
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this.symbol = symbol;
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}
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public String getSymbol() {
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return symbol;
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}
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}
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