一些是我糾錯(cuò)完善后，用來復(fù)習(xí)的Java易忘題！

/* 6.聲明形狀類，形狀有正方形，長(zhǎng)方形，重載其構(gòu)造方法，如果傳入一個(gè)參數(shù)是正方形，2個(gè)參數(shù)是長(zhǎng)方形，聲明計(jì)算形狀面積的方法，打印其面積 */

package a;

class chongzai {

int chang;

int kuan;

int bianchang;

public chongzai(int chang) {

this. chang=chang;

}

public chongzai(int chang,int kuan) {

this. chang=chang;

this. kuan=kuan;

}

/*或public chongzai(int longs, int wide) {

System. out. println("這是一個(gè)長(zhǎng)方形");

countArea (longs, wide) ;

}*/

public static void countArea(int bianchang) {

System. out. println("這是一個(gè)正方形,面積:"+bianchang *bianchang);}

public static void countArea(int? chang, int kuan){

System. out. println("這是一個(gè)長(zhǎng)方形,面積:"+ chang *kuan);

}

public static void main(String[] args) {

chongzai.countArea(2);

chongzai.countArea(2,3);

/*或countArea(2);

countArea(2,3);*/

}

}