package pro;
import pro.point.s;
class point {
double x,y;
point(){}
point(double x,double y){
this.x=x;
this.y=y;}
void show(){
System.out.println("("+x+","+y+")");
}
static class s {
point p1,p2;
double s;
s(){}
s(point p1,point p2){
this.p1=p1;this.p2=p2;
s = Math.sqrt((p1.x - p2.x) * (p1.x - p2.x)
+(p1.y-p2.y) * (p1.y-p2.y));
}
void show() {System.out.println(s);}
}
}
public class dian {
public static void main(String[] args){
s s1 =new s();
point p1=new point(2,3);
point p2=new point(2,5);
p1.show();
p2.show();
s1.show();
}
}
uj5u.com熱心網友回復：
s s1 =new s();...
s1.show()；
實體化 s1 的時候，并未呼叫傳參建構式，double s 則永為默認值0.
class point {
double x, y;
point() {
}
point(double x, double y) {
this.x = x;
this.y = y;
}
void show() {
System.out.println("(" + x + "," + y + ")");
}
static class s {
point p1, p2;
double s;
s() {
}
s(point p1, point p2) {
this.p1 = p1;
this.p2 = p2;
s = Math.sqrt((p1.x - p2.x) * (p1.x - p2.x) + (p1.y - p2.y) * (p1.y - p2.y));
}
void show() {
System.out.println(s);
}
}
public static void main(String[] args) {
point p1 = new point(2, 3);
point p2 = new point(2, 5);
p1.show();
p2.show();
s s1 = new s(p1,p2);
s1.show();
}
}
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標籤：Eclipse
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