java - 如何在java中比较两个 double 值与字符串类型的关系？

Question

我需要比较两个关系类型为字符串的 double 值。 例如:

String relation = "<=";
   double aAA=5.9,bBB=6.999999;

上面的例子中需要使用java比较aAA关系bBB

Answer 1

您可以创建一个将字符串映射到实际操作的Map，例如如BiPredicate .

Map<String, BiPredicate<Double, Double>> relations = new HashMap<>();
relations.put("<=", (a, b) -> a <= b);
relations.put(">=", (a, b) -> a >= b);
relations.put("==", (a, b) -> a == b);
// ...

String relation = "<=";
double aAA=5.9,bBB=6.999999;

boolean result = relations.get(relation).test(aAA, bBB);