Rectangle.java:32: unexpected type
required: class
found : value
这是段代码报的第一个错!public class Rectangle {
Point a;
Point b;
Point c;
Point d;
Point getPointa (Rectangle r) {
return r.a;
}
Point getPointb (Rectangle r) {
return r.b;
}
Point getPointc (Rectangle r) {
return r.c;
}
Point getPointd (Rectangle r) {
return r.d;
}
boolean f(Rectangle r ) {
double p1 = r.getPointa(r).getX();
double p2 = r.getPointa(r).getY();
double o1 = r.getPointb(r).getX();
double o2 = r.getPointb(r).getY();
double i1 = r.getPointc(r).getX();
double i2 = r.getPointc(r).getY();
double n1 = r.getPointd(r).getX();
double n2 = r.getPointd(r).getY();
if( (p1- o1)*(p1-o1)+(p2-o2)(p2-o2)==(i1-n1)*(i1-n1)+(i2-n2)*(i2-n2)&&(p1-n1)*(p1-n1)+(p2-n2)*(p2-n2)==(o1-i1)*(o1-i1)+(o1-i1)*(o1-i1))
return true;
else
return false;
}
double getArea(Rectangle r) {
double p1 = r.getPointa(r).getX();
double p2 = r.getPointa(r).getY();
double o1 = r.getPointb(r).getX();
double o2 = r.getPointb(r).getY();
double i1 = r.getPointc(r).getX();
double i2 = r.getPointc(r).getY();
double n1 = r.getPointd(r).getX();
double n2 = r.getPointd(r).getY();
double area = 0;
area = ((p1- o1)*(p1-o1)+(p2-o2)(p2-o2))*((p1-n1)*(p1-n1)+(p2-n2)*(p2-n2));
return area;
}
public static void main(String [] args) {
Rectangle r = new Rectangle();
Point n = new Point(0 , 0) ;
r.a = new Point( 2.3 , 1.6);
r.b = new Point( 6.3 , 1.6);
r.c = new Point( 6.3 , 3.6);
r.d = new Point( 2.3 , 3.6);
if (r.f(r) == true)
System.out.println(r.getArea(r));
}
}class Point {
double x , y;
Point (double x , double y) {
this.x = x ;
this.y = y;
}
double setX(double x) {
return this.x = x;
}
double setY(double y) {
return this.y = y;
}
double getX() {
return x;
}
double getY() {
return y;
}
}
我想知道这是为什么啊?
required: class
found : value
这是段代码报的第一个错!public class Rectangle {
Point a;
Point b;
Point c;
Point d;
Point getPointa (Rectangle r) {
return r.a;
}
Point getPointb (Rectangle r) {
return r.b;
}
Point getPointc (Rectangle r) {
return r.c;
}
Point getPointd (Rectangle r) {
return r.d;
}
boolean f(Rectangle r ) {
double p1 = r.getPointa(r).getX();
double p2 = r.getPointa(r).getY();
double o1 = r.getPointb(r).getX();
double o2 = r.getPointb(r).getY();
double i1 = r.getPointc(r).getX();
double i2 = r.getPointc(r).getY();
double n1 = r.getPointd(r).getX();
double n2 = r.getPointd(r).getY();
if( (p1- o1)*(p1-o1)+(p2-o2)(p2-o2)==(i1-n1)*(i1-n1)+(i2-n2)*(i2-n2)&&(p1-n1)*(p1-n1)+(p2-n2)*(p2-n2)==(o1-i1)*(o1-i1)+(o1-i1)*(o1-i1))
return true;
else
return false;
}
double getArea(Rectangle r) {
double p1 = r.getPointa(r).getX();
double p2 = r.getPointa(r).getY();
double o1 = r.getPointb(r).getX();
double o2 = r.getPointb(r).getY();
double i1 = r.getPointc(r).getX();
double i2 = r.getPointc(r).getY();
double n1 = r.getPointd(r).getX();
double n2 = r.getPointd(r).getY();
double area = 0;
area = ((p1- o1)*(p1-o1)+(p2-o2)(p2-o2))*((p1-n1)*(p1-n1)+(p2-n2)*(p2-n2));
return area;
}
public static void main(String [] args) {
Rectangle r = new Rectangle();
Point n = new Point(0 , 0) ;
r.a = new Point( 2.3 , 1.6);
r.b = new Point( 6.3 , 1.6);
r.c = new Point( 6.3 , 3.6);
r.d = new Point( 2.3 , 3.6);
if (r.f(r) == true)
System.out.println(r.getArea(r));
}
}class Point {
double x , y;
Point (double x , double y) {
this.x = x ;
this.y = y;
}
double setX(double x) {
return this.x = x;
}
double setY(double y) {
return this.y = y;
}
double getX() {
return x;
}
double getY() {
return y;
}
}
我想知道这是为什么啊?
area = ((p1- o1)*(p1-o1)+(p2-o2)+(p2-o2))*((p1-n1)*(p1-n1)+(p2-n2)*(p2-n2));
少2个运算符号~
你的class编译就没通过~
你要是初学者不建议使用该记事本,用个IDE学得快些