Question

java题：设计point类用来定义平面上的一个点，用构造函数传递坐标位置编写测试类在该类中实现point类的对

再加一道：设计长方形类，成员变量包括长方形的长和宽。类中由计算面积和周长的方法，并有相应的set和get方法设置，获得得长方形的长和宽。编写测试类是否达到预定功能要求使用自定义的包。

Answer 1

1.
class Point{
public int x,y;
public Point(int x,int y){
this.x=x;
this.y=y;
}
}
class test{
Point point=new Point(1,2);
System.out.println(point.x);
System.out.println(point.y);
}

2.
package test.rect;
class RECT{
int width=0,height=0;
public void setWidth(int w){
width=w;
}
public void setHeight(int h){
height=h;
}
public int getWidth(){
return width;
}
public int getHeight(){
return height;
}
public int s(){
return width*height;
}
public int l(){
if(width != 0 && height != 0)
return 2*(width+height);
else
return 0;
}
}

class test(){
RECT rect=new RECT();
rect.setWidth(5);
rect.setHeight(6);
System.out.println(rect.s());
System.out.println(rect.l());
}

Answer 2

第一题：

/* MyPoint.java */

// class MyPoint
public class MyPoint {

public MyPoint(int x,int y) {
this.x = x;
this.y = y;
}

public int getX() {
return x;
}

public int getY() {
return y;
}

private int x;
private int y;

}

/* Test.java */

// class Test
public class Test{

public static void main(String[] args) {
MyPoint point = new MyPoint(3, 4);
System.out.println(point.getX());
System.out.println(point.getY());
}
}

第二题：
/* MyRect.java */

package myShapes;

// class MyRect
public class myRect {

public MyRect() {};

public MyRect(int h, int w) {
width = w;
height = h;
}

public void setWidth(int w) {
width = w;
}

public void setHeight(int h) {
height = h;
}

public int getWidth() {
return width;
}

public int getHeight() {
return height;
}

public int area() {
return width * height;
}

public int perimeter() {
return 2 * (width + height);
}

private int width;
private int height;
}

/* Test.java */
package myShapes;

// class Test
public class Test() {

public static void main(String[] args) {
MyRect rect = new MyRect(8, 9);
System.out.println(rect.getWidth());
System.out.println(rect.getHeight());
System.out.println(rect.area());
System.out.println(rect.perimeter());

MyRect rect=new MyRect();
rect.setWidth(7);
rect.setHeight(8);
System.out.println(rect.getWidth());
System.out.println(rect.getHeight());
System.out.println(rect.area());
System.out.println(rect.perimeter());
}
}

第二题的程序文件要存在myShapes的文件夹中。

Answer 3

java题：设计point类用来定义平面上的一个点，用构造函数传递坐标位置编写测试类在该类中实现point类的对

Answer 4

编写平面坐标类Point并测试