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;
}
}
