我正在使用独立课程和主要驱动程序,这是独立课程:
public class Bugs{
private String bugType;
private int legs;
private int arms;
private String nativeTo;
public Bugs(String bt, int l, int a, String nt){
bt=bugType;
l=legs;
a=arms;
nt=nativeTo;
}
public Bugs(String bt, int l, int a){
bt=bugType;
l=legs;
a=arms;
nativeTo="Not known";
}
public String getbt(){
return bugType;
}
public void setbugType(String bugType){
this.bugType=bugType;
}
public int getlegs(){
return legs;
}
public void setlegs(int legs){
this.legs=legs;
}
public int getarms(){
return arms;
}
public void setarms(int arms){
this.arms=arms;
}
public String getnativeTo(){
return nativeTo;
}
public void setnativeTo(String nativeTo){
this.nativeTo=nativeTo;
}
public String toString(){
return bugType + " has " + legs + arms + nativeTo;
}
}
这是主要的驱动因素:
public class myBugs{
public static void main (String args[]){
Bugs asiaBeetle = new Bugs("Asian Beetle", 2, 2, "Japan");
Bugs spider = new Bugs("Spider", 1000, 0);
Bugs americanBeetle = new Bugs("American Beetle", 2, 2, "USA");
System.out.println(asiaBeetle);
}
}
每次运行主驱动程序时,JGRASP都会一直返回“null has 00null”。我做错了什么?
答案 0 :(得分:4)
在构造函数中交换您的作业:
public Bugs(String bt, int l, int a, String nt){
bugType = bt;
legs = l;
arms = a;
nativeTo = nt;
}
你必须为另一个做同样的事情:
public Bugs(String bt, int l, int a){
bugType = bt;
legs = l;
arms = a;
nativeTo="Not known";
}
答案 1 :(得分:2)
将你的构造函数改为这个offcourse为另一个做同样的事情
public Bugs(String bt, int l, int a, String nt){
bugType=bt;
legs=l;
arms=a;
nativeTo= nt;
}