?? operation.java
字號(hào):
// Typesafe enum with behaviors attached to constants
public abstract class Operation {
private final String name;
Operation(String name) { this.name = name; }
public String toString() { return this.name; }
// Perform arithmetic operation represented by this constant
abstract double eval(double x, double y);
public static final Operation PLUS = new Operation("+") {
double eval(double x, double y) { return x + y; }
};
public static final Operation MINUS = new Operation("-") {
double eval(double x, double y) { return x - y; }
};
public static final Operation TIMES = new Operation("*") {
double eval(double x, double y) { return x * y; }
};
public static final Operation DIVIDED_BY =
new Operation("/") {
double eval(double x, double y) { return x / y; }
};
}
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