import java.awt.Point;
public class Point_109 {
public double distance(){
return Math.sqrt(x*x+y*y);
}
static void main(String args[]){
Point_109 p=new Point_109(1,1);
System.out.println("p.distance=" + p.distance());
p=new Point3d(1,1,1);
System.out.println("p.distance=" + p.distance());
}}
class Point3d extends Point_109 {
public double distance(){
return Math.sqrt(x*x+y*y+z*z);
}
}
public class Point_109 {
public double distance(){
return Math.sqrt(x*x+y*y);
}
static void main(String args[]){
Point_109 p=new Point_109(1,1);
System.out.println("p.distance=" + p.distance());
p=new Point3d(1,1,1);
System.out.println("p.distance=" + p.distance());
}}
class Point3d extends Point_109 {
public double distance(){
return Math.sqrt(x*x+y*y+z*z);
}
}
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选择未包含main 类型
构造函数 Point109(int, int)未定义
构造函数 Point3d(int, int, int)未定义 at Point109.main(Point109.java:8)
public double distance(){
return Math.sqrt(x*x+y*y);
}
public static void main(String args[]){
Point109 p=new Point109(1,1);
System.out.println("p.distance=" + p.distance());
p=new Point3d(1,1,1);
System.out.println("p.distance=" + p.distance());
}
}class Point3d extends Point109 {
public double distance(){
return Math.sqrt(x*x+y*y+z*z);
}
}
构造函数 Point3d(int, int, int)未定义 已经说得很明白了,你看看这两个方法你定义了没有?
void Point_109(int x,int y){}
各位给说下吧!public class Point109 {
int x,y;
Point109(int x1,int y1){
x=x1;
y=y1;
}
public double distance(){
return Math.sqrt(x*x+y*y);
}
public static void main(String args[]){
Point109 p=new Point109(1,1);
System.out.println("p.distance=" + p.distance());
p=new Point3d(1,1,1);
System.out.println("p.distance=" + p.distance());
}
}
/////////////////////////////////////////////
class Point3d extends Point109 {
int z;
public Point3d(int x1,int y1,int z1){
x=x1;
y=y1;
z=z1;
}
public double distance(){
return Math.sqrt(x*x+y*y+z*z);
}
}
/////////////////////////////////////////////////////////public class Point109 {
int x,y;
Point109(int x1,int y1){
x=x1;
y=y1;
}
public double distance(){
return Math.sqrt(x*x+y*y);
}
public static void main(String args[]){
Point109 p=new Point109(1,1);
System.out.println("p.distance=" + p.distance());
p=new Point3d(1,1,1);
System.out.println("p.distance=" + p.distance());
}
}class Point3d extends Point109 {
int z;
public Point3d(int x,int y,int z){
super(x,y);
this.z=z;
}
public double distance(){
return Math.sqrt(x*x+y*y+z*z);
}
}