class point {
int x , y;
public point(int a, int b ){
x=a; y=b;
//System.out.println(a+" "+b);
}
//System.out.println(a+" "+b);
}
public class AtwoPoint{
public static void main(String [ ]args){
point p1= new point ( ), p2= new point ( );

p1.x=10; p1.y=20;
p2.x=30; p2.y=40;
System.out.println("x = "+ p1.x +" y= "+p1.y);
System.out.println("x = "+ p2.x +" y= "+p2.y);
//System.out.println(p.a+" "+p.b);

=============================================
你给我从上面的代码中找出定义p的语句来，你都没有定义，怎么可能可以调用p呢
你只定义了p1,p2

class point {
int x , y;
void init(int a, int b ){
x=a; y=b;
}
}
public class twoPoint{
public static void main(String [ ]args){
point p1= new point ( ), p2= new point ( );
p1.init=(10,20);
p2.init=(100,200);
System.out.println(p1);
System.out.println(p2);
}
}


改成这样，好象也不对 请指教！

p1.init=(10,20);
p2.init=(100,200);

你这样表示本身就不行的

看看这个就明白了,前几天弄了半天才弄出来的
现在看来好弱智的一个问题

class point {
int x , y;
point(int a, int b ){
x=a; y=b;
System.out.println("a="+a+" "+"b="+b);
}
}
public class twoPoint{
public static void main(String args[]){
point p1= new point (10,20 ), p2= new point (30,40 );


System.out.println(p1.x +" "+p1.y);
System.out.println(p2.x +" "+p2.y);
}
}