Those years, learn together Java 5-3

/**5-3

* Add a new Printitmyway (char) method to the printable interface,

* This method has a character-type parameter, and the return value is null.

* Its function is to use the given character to print, for example, if the given character is *, a length of 4

* The screen with a width of 3 rectangle is printed as:

* ****

* ****

* ****

**/

public class firstprogram{public static void main  (String[] args) {Rectangle  rectangle = new rectangle (5, 3); Square square = new square (4); Rectangle.printitmyway (' * '); Square.printitmyway (' * ');}} Interface printable{void printitmyway (); Void printitmyway (char n);}  class rectangle implements printable{protected int length;protected int  width; rectangle  () {}rectangle (int l, int w) {this.length = l;this.width = w;} Void show () {System.out.println (" length: "  + length +  " width: "  + width);} Void print (char n) {int i, j;for  (i = 0; i < width; i + +) {for  (j = 0; j < length; j++) System.out.print (" "  + n  +  " "); System.out.println ();} System.out.println ();} int perimeter  () {return  (Length + width)  * 2;} int area  () {return length * width;}     public void printitmyway () {this.show (); System.out.println (" permiter: "  + this.perimeter ()  +  " area: "  +  this.area ());}     public void printitmyway (char n)     {     this.print (n);     }} class square  extends rectangle{ protected int side; square  (int side) {super (); this.side = side;} Void show () {System.out.println (" side: "  + side);} Void print (char n) {int i, j;for  (i = 0; i < side; i+ +) {for  (j = 0; j < side; j++) System.out.print (" "  + n  +  " "); System.out.println ();}} Int perimeter  () {return 4 * side;} int area  () {return side * side;}}

This article is from the "hacker" blog, make sure to keep this source http://anglecode.blog.51cto.com/5628271/1619857

Those years, learn together Java 5-3