public enum Symbol extends Enum<Symbol>
public static final Symbol NUM
public static final Symbol ADD
public static final Symbol SUB
public static final Symbol MUL
public static final Symbol DIV
public static Symbol[] values()
for (Symbol c : Symbol.values()) System.out.println(c);
public static Symbol valueOf(String name)
name - 要返回的枚举常量的名称。IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量NullPointerException - 如果参数为空值public static Symbol of(char c)
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