package digital;
/**编写MyPoint的一个子类MyXYZ,
* 表示三维坐标点,重写toString方法用来显示这个对象的x,y,z的值,
* 如显示(1,2,3),最后用main方法测试。
* */
public class MyXYZ extends MyPoint {
static int x;
static int y;
static int z;
public int x(){
return x;
}
public int y(){
return y;
}
public int z(){
return z;
}
public String toString(){
return "("+x+","+y+","+z+")";
}
public static void main(String[] args){
MyPoint point = new MyPoint();
point.x(1);
point.y(2);
point.z(3);
System.out.println(x);
System.out.println(y);
System.out.println(z);
}
}
----------------------------
package digital;public class MyPoint { public void y(int i) {
// TODO Auto-generated method stub
} public void x(int i) {
// TODO Auto-generated method stub
} public void z(int i) {
// TODO Auto-generated method stub
}}
/**编写MyPoint的一个子类MyXYZ,
* 表示三维坐标点,重写toString方法用来显示这个对象的x,y,z的值,
* 如显示(1,2,3),最后用main方法测试。
* */
public class MyXYZ extends MyPoint {
static int x;
static int y;
static int z;
public int x(){
return x;
}
public int y(){
return y;
}
public int z(){
return z;
}
public String toString(){
return "("+x+","+y+","+z+")";
}
public static void main(String[] args){
MyPoint point = new MyPoint();
point.x(1);
point.y(2);
point.z(3);
System.out.println(x);
System.out.println(y);
System.out.println(z);
}
}
----------------------------
package digital;public class MyPoint { public void y(int i) {
// TODO Auto-generated method stub
} public void x(int i) {
// TODO Auto-generated method stub
} public void z(int i) {
// TODO Auto-generated method stub
}}
point.y(2);
point.z(3);
你想用这个赋值??.....父类连个实现都没怎么赋值
自身属性用static干嘛...给main方法访问也不用这样写啊,new对象再访问
* 表示三维坐标点,重写toString方法用来显示这个对象的x,y,z的值,
* 如显示(1,2,3),最后用main方法测试。
* */
public class MyXYZ extends MyPoint {
static int x;
static int y;
static int z;
public void x(int x){
this.x=x;
}
public void y(int y){
this.y=y;
}
public void z(int z){
this.z=z;
}public String toString(){
return "("+this.x+","+this.y+","+this.z+")";
}
public static void main(String[] args){
MyPoint point = new MyXYZ();
point.x(1);
point.y(2);
point.z(3);
System.out.println(MyXYZ.x);
System.out.println(MyXYZ.y);
System.out.println(MyXYZ.z);
System.out.println(point.toString());
}
}class MyPoint {public void y(int i) {
// TODO Auto-generated method stub}public void x(int i) {
// TODO Auto-generated method stub}public void z(int i) {
// TODO Auto-generated method stub}}
MyPoint point = new MyPoint();
point.x(1);
point.y(2);
point.z(3);
System.out.println(x);
System.out.println(y);
System.out.println(z);
}
main方法里的 MyPoint point = new MyPonint(),是生成了MyPoint对象,方法还没有实现。如果你想用多态,有以下参考
public static void main(String[] args)
{
MyPoint point = new MyXYZ();
point.x(1);
point.y(2);
point.z(3);
System.out.println(MyXYZ.x);
System.out.println(MyXYZ.y);
System.out.println(MyXYZ.z);
System.out.println(point.toString());
}同楼上
* 编写MyPoint的一个子类MyXYZ, 表示三维坐标点,重写toString方法用来显示这个对象的x,y,z的值,
* 如显示(1,2,3),最后用main方法测试。
* */
public class MyXYZ extends MyPoint {
static int x;
static int y;
static int z; public int x() {
return x;
} public int y() {
return y;
} public int z() {
return z;
} public String toString() {
return "(" + x + "," + y + "," + z + ")";
} public static void main(String[] args) {
MyPoint point = new MyPoint();
//你这是什么意思
point.x(1);
point.y(2);
point.z(3);
//x,y,z没有显示的赋值,默认初始化为0,你应该定义一个构造方法,然后给x,y,z赋值
System.out.println(x);
System.out.println(y);
System.out.println(z);
}
}class MyPoint { public void y(int i) {
// TODO Auto-generated method stub } public void x(int i) {
// TODO Auto-generated method stub } public void z(int i) {
// TODO Auto-generated method stub }}
private int z;
public MyXYZ(){
super();
z=0;
}
public MyXYZ(int a){
z=a;
}
public int getZ(){
return z;
}
public String toString(){
return "("+super.getX()+","+super.getY()+","+this.getZ()+")";
}
public static void main(String[] args) {
// TODO Auto-generated method stub
MyXYZ my = new MyXYZ(23);
System.out.println(my);
}
}