重构16-Encapsulate Conditional（封装条件）

当代码中充斥着若干条件判断时，代码的真正意图会迷失于这些条件判断之中。这时我喜欢将条件判断提取到一个易于读取的属性或方法（如果有参数）中。重构之前的代码如下：

public class RemoteControl {
    private String[] Functions;//getter setter
private String Name;//getter setter
private int CreatedYear;//getter setter

public String PerformCoolFunction(String buttonPressed) {
        // Determine if we are controlling some extra function
        // that requires special conditions
if (Functions.length > 1 && Name == "RCA" && CreatedYear > new Date().getYear() - 2) {
            return "doSomething";
}
        return null;
}
}

重构之后，代码的可读性更强，意图更明显：

public class RemoteControl {
    private String[] Functions;//getter setter
private String Name;//getter setter
private int CreatedYear;//getter setter
private Boolean HasExtraFunctions;

    public Boolean getHasExtraFunctions() {
        return Functions.length > 1 && Name == "RCA" && CreatedYear > new Date().getYear() - 2;
}
    public String PerformCoolFunction(String buttonPressed) {
        // Determine if we are controlling some extra function
        // that requires special conditions
if (HasExtraFunctions) {
            return "doSomething";
}
        return null;
}
}

来自为知笔记(Wiz)