Java编写一个矩形类，并计算面积和周长？
class Rectangle{
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private int width = 2;
private int length = 1;
public int getWidth(){
return this.width;
}
public void setWidth(int w){
this.width = w;
}
public int getLength(){
return this.length;
}
public void setLength(int l){
this.length = l;
}
public int getArea(){
return this.length * this.width;
}
public int getCircumference(){
return (this.length + this.width) * 2;
}
public Rectangle(){}
public Rectangle(int l, int w){
this.length = l;
this.width = w;
}
}
public class demo{
public static void main(String[] args) {
Rectangle rect = new Rectangle(30, 8);
System.out.print("长方形的面积是：");
System.out.println(rect.getArea());
System.out.printf("长方形的周长是：%d\n", rect.getCircumference());
}
}
编写一个JAVA程序，描写一个矩形类，并输出某个矩形的长，宽，面积。具体描述如下？
// 矩形
public class RectangleDemo {
public static void main(String[] args) {
RectangleDemo demo = new RectangleDemo(12, 32);
System.out.println(demo.getPerimeter());
System.out.println(demo.getArea());
demo = new RectangleDemo();
System.out.println(demo.getArea());
System.out.println(demo.getPerimeter());
demo.setHeight(50);
demo.setWidth(30);
System.out.println(demo.getArea());
System.out.println(demo.getPerimeter());
}
// 求周
public double getPerimeter() {
return (height + width) * 2;
}
// 求面积
public double getArea() {
return height * width;
}
public RectangleDemo(double height, double width) {
this.height = height;
this.width = width;
}
public RectangleDemo() {
this.height = 10;
this.width = 10;
}
private double height;// 高度
private double width;// 宽度
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
}
编写矩形类RectangleJava程序矩形类两数据员别rLength宽rWidth通getLength()、getWidth()、getArea()别查看矩形、宽面积通setLength()setWidth()重新设置矩形宽
求java 输出正方形（用*号）的代码！
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.println("请输入正方形的大小：");
int line = s.nextInt();; // 正方形的边长
for (int i = 1; i = line; i++) { // 行
for (int j = 1; j = line; j++) { // 列
if (i == 1 || i == line) { // 如果是第一行或者是最后一行则输出星号
System.out.print("* ");
} else if (j == 1 || j == line) { // 如果是第一列或者是最后一列则输出星号
System.out.print("* ");
} else {
System.out.print(" "); // 如果不是第一行、最后一行、第一列、最后一列则输出空格
}
}
System.out.print("\n"); // 换行
}
}
Java编写一个矩形类,至少包含以下方法：
import java.awt.Point;
public class Rectangle {
private int widthT = 0;
private int heightT = 0;
Point point = new Point();
public Rectangle(int width, int height, int centerX, int centerY) {
widthT = width;
heightT = height;
point.x = centerX;
point.y = centerY;
}
public int width() {
return widthT;
}
public int height() {
return heightT;
}
public int centerX() {
return point.x;
}
public int centerY() {
return point.y;
}
}
麻烦采纳呦~~~亲
文章名称：java程序求矩形代码,编写一个求矩形面积的c语言程序
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