面向對象的思想 package com.special.spet;

import java.util.Scanner;

/**

*

* @author special

* @date 2017年9月6日 下午5:35:09

*/

class Point{

private int x;

private int y;

private static final char[] INSTRUCT_LETTER = {'A', 'S', 'W', 'D'};

public int getX(){

return x;

}

public int getY(){

return y;

}

private static boolean contain(char ch){

for(char item : INSTRUCT_LETTER)

if(item == ch)

return true;

return false;

}

private static boolean isNum(char ch){

if(ch >= '0' && ch <= '9') return true;

else return false;

}

public static boolean isStandard(String instruct){

if(instruct.length() > 3 || !contain(instruct.charAt(0))) { return false; }

for(int i = 1; i < instruct.length(); i++)

if(!isNum(instruct.charAt(i)))

return false;

return true;

}

/**

* 處理每一個指令，包括判斷是否合格

* [@param instruct

* @return](/profile/547241) 一個待移動量的Point對象

*/

public static Point prestationOfInstruct(String instruct){

Point target = new Point();

if(!isStandard(instruct)) {return target;}

int steps = Integer.parseInt(instruct.substring(1));

switch(instruct.charAt(0)){

case 'A': target.x = -steps; break;

case 'S': target.y = -steps; break;

case 'W': target.y = steps; break;

case 'D': target.x = steps; break;

}

return target;

}

/**

* 根據參數的移動量的target來進行相加(減法其實也是一種加法)

* @param target

*/

public void move(Point target){

this.x += target.x;

this.y += target.y;

} [@Override](/profile/992988) public String toString(){

return x + "," + y;

}

}

public class Pro16 {

public static void main(String[] args){

Scanner input = new Scanner(System.in);

while(input.hasNext()){

String str = input.nextLine();

String[] instructs = str.split(";");

Point origin = new Point();

for(String instruct : instructs)

origin.move(Point.prestationOfInstruct(instruct));

System.out.println(origin);

}

}

}

進一步優化： package com.special.spet;

import java.util.Scanner;

/**

*

* @author special

* @date 2017年9月6日 下午10:05:48

*/

class Point{

private int x;

private int y;

public int getX(){

return x;

}

public int getY(){

return y;

}

public void setX(int x) {

this.x = x;

}

public void setY(int y) {

this.y = y;

}

@Override

public String toString(){

return x + "," + y;

}

}

public class Pro16Improve {

/**

* 利用空間存儲指令的方向移量

*/

private static final String INSTRUCT_LETTER = "ASWD";

private static final int[] distenceX = {-1, 0, 0, 1};

private static final int[] distenceY = {0, -1, 1, 0};

private static int find(char ch){

for(int i = 0; i < INSTRUCT_LETTER.length(); i++){

if(ch == INSTRUCT_LETTER.charAt(i))

return i;

}

return -1;

}

private static boolean isNum(char ch){

if(ch >= '0' && ch <= '9') return true;

else return false;

}

public static void move(Point point, String instruct){

if(instruct.equals("") || instruct.length() > 3 || find(instruct.charAt(0)) == -1) { return ;}

int x = 0;

int y = 0;

for(int i = 1; i < instruct.length(); i++){

if(isNum(instruct.charAt(i))){

// x,y上的移量為倍數乘以單位移量

x = x * 10 + (instruct.charAt(i) - '0') * distenceX[find(instruct.charAt(0))];

y = y * 10 + (instruct.charAt(i) - '0') * distenceY[find(instruct.charAt(0))];

}

else return;

}

point.setX(point.getX() + x);

point.setY(point.getY() + y);

}

public static void main(String[] args){

Scanner input = new Scanner(System.in);

while(input.hasNext()){

String str = input.nextLine();

String[] instructs = str.split(";");

Point origin = new Point();

for(String instruct : instructs)

move(origin, instruct);

System.out.println(origin);

}

}

}

總結

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