1 定义三个方法:getArea()求面积、getPer()求周长,showAll()分别在控制台输出长、宽、面积、周长。
2 有2个属性:长length、宽width
3 创建一个Rectangle对象,并输出相关信息
package java_test; public class Rectangle { int length; int width; public void getArea() { System.out.println(length * width); } public void getPer() { System.out.println((length + width)*2); } public void showAll() { System.out.println("长是:" + length); System.out.println("宽是:" + width); System.out.println("面积是:"); getArea(); System.out.println("周长是:"); getPer(); } }
package java_test; import java.util.Scanner; public class test_6_2 { public static void main(String[] args) { // TODO Auto-generated method stub Rectangle al = new Rectangle(); Scanner input = new Scanner(System.in); System.out.print("请输入长:"); al.length = input.nextInt(); System.out.print("请输入宽:"); al.width = input.nextInt(); al.showAll(); } }