Java Switch优化_用反射优化Switch太长的方法

shutiaoya

发布于 2022-08-30 13:41:07

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这是一个普通的switch

class Employee {

    double payAmt(String level){
        double salary = 0;

        switch (level) {
            case  "Level1":
                salary = 100;
                break;
            case  "Level2":
                salary = 200;
                break;
            case  "Level3":
                salary = 300;
                break;
        }
        return salary;
    }
}

这些中间的各种case处理结果可以抽出来，成立一个抽象父类

public abstract class Employee1 {

    public  abstract double payAmt();
}

建立子类继承父类，根据自己的计算规则重写方法

public class Level1 extends Employee1{

    @Override
    public double payAmt() {
        return 100;
    }
}

这个时候再用多态跟反射去调用，就可以了

@Test
public void test() throws ClassNotFoundException, InstantiationException, IllegalAccessException {
    String level = "Level2";

    Employee1 employee1 = (Employee1) Class.forName("com.valtech.java."+level).newInstance();

    System.out.println(employee1.payAmt());
}