java - 如何在重载的构造函数中调用mutator方法而不是在java中分配它们？
public class Player
{
private String firstName;
private String lastName;
private int heightInInches;
private double weightInPounds;
private boolean goalScorer;
private boolean drinksBeer;
public Player(){
}
public Player(String firstName, String lastName, int heightInInches, double weightInPounds, boolean goalScorer, boolean drinksBeer){
if(lastName != null && lastName.trim().length() > 0){
if(lastName != null && lastName.trim().length() > 0){
if(heightInInches >= 0){
if(weightInPounds >= 0){
this.firstName = firstName;
this.lastName = lastName;
this.heightInInches = heightInInches;
this.weightInPounds = weightInPounds;
this.goalScorer = goalScorer;
this.drinksBeer = drinksBeer;
}
}
}
}
}
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
public int getHeightInInches(){
return heightInInches;
}
public double getWeightInPounds(){
return weightInPounds;
}
public boolean getGoalScorer(){
return goalScorer;
}
public boolean getDrinksBeer(){
return drinksBeer;
}
public void setFirstName(String firstName){
if(firstName != null && firstName.trim().length() > 0){
this.firstName = firstName;
}else{
System.out.println("Error. Invalid First Name.");
}
}
public void setLastName(String lastName){
if(lastName != null && lastName.trim().length() > 0){
this.lastName = lastName;
}else{
System.out.println("Error. Invalid Last Name.");
}
}
在重载的构造函数中，如何不使用赋值语句为每个字段调用 mutator 方法？并且如果我调用 mutator 方法，我应该删除构造函数中的 if 语句吗？（我使用的是blueJ）我是初学者，所以请说明我的代码中是否还有其他问题。提前致谢。
吃鸡游戏1回答
-
函数式编程
您所要做的就是像任何其他方法一样引用 mutator 方法：public Player(String firstName, String lastName, int heightInInches, double weightInPounds, boolean goalScorer, boolean drinksBeer) { setFirstName(firstName); setLastName(lastName); setHeightInInches(heightInInches); setWeightInPounds(weightInPounds); setGoalScorer(goalScorer); setDrinksBeer(drinksBeer);}此外，不需要那些 if 语句，因为它们实际上并没有做任何有用的事情。如果您没有明确设置任何值，int变量将默认为0、double默认为0.0、boolean默认为false、String默认为null。因此，您的 if 语句正在执行诸如“如果名字是null，请不要设置它……所以null无论如何它都会默认”之类的事情。如果你想做一些事情，比如强制高度为正数，你总是可以把这个逻辑放在 setter 中。
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相关分类
Java