我是
java的新手,我正在做一个简单的程序,但我不知道为什么我在我的程序中遇到错误,当我尝试使用超级…有人可以解释我或我的错误是什么,因为它不接受super.myCoord()我应该更改或添加什么？
public class myCoord {
private double coorX,coorY;
public myCoord(){
coorX = 1;
coorY = 1;
}
public myCoord(double x,double y){
coorX = x;
coorY = y;
}
void setX(double x){
coorX = x;
}
void setY(double y){
coorY = y;
}
double getX(){
return coorX;
}
double getY(){
return coorY;
}
public String toString(){
String nuevo = "("+coorX+","+coorY+")";
return nuevo;
}
public class Coord3D extends myCoord{
private double coorZ;
Coord3D(){
super.myCoord(); // ---> I got an error here !!
coorZ = 1;
}
Coord3D(double x,double y,double z){
super.myCoord(x,y); ---> Also here !!
coorZ = z;
}
void setZ(double z){
coorZ = z;
}
double getZ(){
return coorZ;
}
}
解决方法
您应该使用点(.)运算符调用方法而不是构造函数.在这里,您使用点(.)调用超类’构造函数.
这就是为什么你会遇到这样的错误：
The method myCoord() is undefined for the type myCoord
和
The method myCoord(double,double) is undefined for the type myCoord
使用这些来调用你的超级构造函数：super();和super(x,y);如下所示.
public class Coord3D extends myCoord {
private double coorZ;
Coord3D() {
super(); // not super.myCoord(); its a constructor call not method call
coorZ = 1;
}
Coord3D(double x,double z) {
super(x,y); // not super.myCoord(x,y); its a constructor call not method call
coorZ = z;
}
}
