根据《 Head First》一书中的例子,我遇到了一些麻烦,其中toString方法导致我的学生出现问题,并且它们是uni且正确输出了家庭住址。如果学生的uni地址为空,我想做的就是输出,使用他的家庭住址,否则使用uni。
但是我的测试数据如下
约翰·约翰诺丁汉径72号
John72诺丁汉大道
public class Test {
public static void main(String[] args){
Student student1 = new Student("John", 19, "Walkers Way");
student1.setUniAddress(72, "Nottingham Drive");
System.out.print(student1.toString());
}
}
其他类
public class Student {
private String name;
private Address homeAddress, uniAddress;
public Student(String name, int houseNumber, String homeStreet){
this.name = name;
this.homeAddress = new Address(houseNumber, homeStreet);
}
public String getName() { return this.name; }
public Address getHomeAddress(){
if(this.uniAddress == null){
return this.homeAddress;
}else{
return getUniAddress();//this.uniAddress;
}
}
public Address getUniAddress() { return this.uniAddress; }
public void setUniAddress(int number, String add){
Address address = new Address(number, add);
uniAddress = address;
}
@Override
public String toString(){
return getName() + " " + getHomeAddress() + " " + getUniAddress() + "\n";
}
public class Address{
private int number;
private String street;
public Address(int no, String street){
this.number = no;
this.street = street;
}
@Override
public String toString(){
return name + number + " " + street + "\n";
}
}
}
最佳答案
您的getHomeAddress
方法负责显示uni地址,因此此行:
return getName() + " " + getHomeAddress() + " " + getUniAddress() + "\n";
可以缩短为:
return getName() + " " + getHomeAddress() + " " + "\n";
否则,您的
getHomeAddress
方法将提取uni地址,然后您的getUniAddress
方法将再次提取uni地址。同样在您的地址
toString
中,您拉的是该人的姓名,并且您可能不是故意的(并且您可能也不想在这里使用换行符,因为您的其他toString
方法中有换行符)。@Override
public String toString(){
return number + " " + street;
}
关于java - 内部类麻烦,toString冲突,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/13313222/