class point{ // 程序4-8
int x, y;
point(int x, int y){
System.out.println("父类构造函数被调用！"+x+" "+y);
}
}
class circle extends point{
circle(int r, int x, int y){

super(x, y);

System.out.println("子类构造函数被调用！");
System.out.println(r+" "+x+" "+y) ;
}
}
public class testInherence {
public static void main(String args[ ]) {
circle c1=new circle(1,1,1);

System.out.println(c1.x+" "+c1.y);
}
}

为什么 System.out.println(c1.x+" "+c1.y); 的结果是 0 0 , 而不是1 1 呢?

哦　c1.x c1.y的值是父类point的　x y 值吧　　
这样说对不对啊？　我加了一句看的：
class point{ // 程序4-8
int x, y;
point(int x,int y){

this.x=2; this.y=2;
System.out.println("父类构造函数被调用！"+x+" "+y);
}
}
class circle extends point{

circle(int r, int x, int y){

super(x, y);

System.out.println("子类构造函数被调用！");
System.out.println(r+" "+x+" "+y) ;
}
}
public class testInherence {
public static void main(String args[ ]) {
　　circle c1=new circle(1,1,1);
　System.out.println(c1.x+" "+c1.y);
}
}

这样运行后　c1.x　c1.y　的值就是　　２　２　了