Question

Java 编写一个矩形类Rect

1、编写一个矩形类Rect.java
包含：
两个私有属性：矩形的宽width；矩形的长length。
一个构造器法：带有两个参数的构造器方法，用于将width和length属性初化。
length和width属性的set和get方法。
两个公有成员方法：分别用于计算并返回矩形的面积和周长。

Answer 1

public class Rect {
private double length;//矩形的长
private double width;//矩形的宽

public Rect() {}//默认构造器

public Rect(double length,double width) {
this.length = length;
this.width = width;
}

/**
* 取得矩形的面积
* */
public double getArea(){
return this.getLength() * this.getWidth();
}

/**
* 取得矩形的周长
* */
public double getPerimeter(){
return (this.getLength() + this.getWidth()) * 2;
}

/**
* 取得矩形的面积，需传入矩形长与宽
* */
public double getArea(double length,double width){
return length * width;
}

/**
* 取得矩形的周长，需传入矩形长与宽
* */
public double getPerimeter(double length,double width){
return (length + width) * 2;
}

public double getLength() {
return length;
}

public void setLength(double length) {
this.length = length;
}

public double getWidth() {
return width;
}

public void setWidth(double width) {
this.width = width;
}
}

Answer 2

public class Rect {
private double width;
private double height;

public Rect(double width, double height) {
this.width = width;
this.height = height;
}

public Rect() {
}

public double getWidth() {
return width;
}

public void setWidth(double width) {
this.width = width;
}

public double getHeight() {
return height;
}

public void setHeight(double height) {
this.height = height;
}

public double getArea() {
return this.width * this.height;
}

public double getAround() {
return 2 * (this.width + this.height);
}
}

Answer 3

public class Rect {

/**
* @param args
*/

private Double width;
private Double length;

public Rect(Double width,Double length){
this.width = width;
this.length = length;

}

public Double getWidth() {
return width;
}

public void setWidth(Double width) {
this.width = width;
}

public Double getLength() {
return length;
}

public void setLength(Double length) {
this.length = length;
}

//计算矩形面积

public Double Rect_Area(){
return this.width*this.length;
}

//计算矩形周长

public Double Rect_Around(){
return 2*(this.width+this.length);
}

}

//测试类
public test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Double w = 20.0;
Double l = 30.0;
Rect rect = new Rect(w,l);
System.out.println("宽度："+w+" 长度："+l+"面积："+rect.Rect_Area());
System.out.println("宽度："+w+" 长度："+l+"周长："+rect.Rect_Around());

}

}

Answer 4

你是不是宁波教育学院的，我是*林君收到请留言。谢谢