Java編寫一個矩形類，并計算面積和周長？

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("長方形的面積是：");

System.out.println(rect.getArea());

System.out.printf("長方形的周長是：%d\n", rect.getCircumference());

}

}

編寫一個JAVA程序，描寫一個矩形類，并輸出某個矩形的長，寬，面積。具體描述如下？

// 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;

}

// 求面積

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;// 寬度

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;

}

}

編寫矩形類RectangleJava程序矩形類兩數(shù)據(jù)員別rLength寬rWidth通getLength()、getWidth()、getArea()別查看矩形、寬面積通setLength()setWidth()重新設(shè)置矩形寬

求java 輸出正方形（用*號）的代碼！

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

System.out.println("請輸入正方形的大小：");

int line = s.nextInt();; // 正方形的邊長

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則輸出星號

System.out.print("* ");

} else if (j == 1 || j == line) { // 如果是第一列或者是最后一列則輸出星號

System.out.print("* ");

} else {

System.out.print(" "); // 如果不是第一行、最后一行、第一列、最后一列則輸出空格

}

}

System.out.print("\n"); // 換行

}

}

Java編寫一個矩形類,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;

}

}

麻煩采納呦~~~親