在我正在制作的名为Flood It的游戏中，我无法打印我正在制作的具有以下构造函数的对象：
Dot(int x, int y, int color)
我有三个类，一个类是DotInfo.java：
public class DotInfo {
private int x;
private int y;
private int color;
private boolean captured;
public DotInfo(int x, int y, int color){
this.x = x;
this.y = y;
this.color = color;
captured = false;
}
public int getX(){
return x;
}
public int getY(){
return y;
}
public void setCaptured(boolean captured) {
this.captured = captured;
}
public boolean isCaptured(){
return captured;
}
public int getColor() {
return color;
}
}
我的第二堂课是GameModel.java：
import java.util.Random;
public class GameModel {
/**
* predefined values to capture the color of a DotInfo
*/
public static final int COLOR_0 = 0;
public static final int COLOR_1 = 1;
public static final int COLOR_2 = 2;
public static final int COLOR_3 = 3;
public static final int COLOR_4 = 4;
public static final int COLOR_5 = 5;
public static final int NUMBER_OF_COLORS = 6;
public static DotInfo[][] dots;
private DotInfo dot;
private int size;
private int currentColor;
private Random generator;
private int steps;
private String rep;
/**
* Constructor to initialize the model to a given size of board.
*
* @param size
* the size of the board
*/
public GameModel(int size) {
this.size = size;
}
/**
* Resets the model to (re)start a game. The previous game (if there is one)
* is cleared up .
*/
public void reset(){
int color = 0;
dots = new DotInfo[size][size];
for (int i=0;i<size;i++) {
for (int j=0;j<size;j++) {
new DotInfo(i, j, generator.nextInt(NUMBER_OF_COLORS)+1);
System.out.println(dots[i][j]);
}
}
}
/**
* Getter method for the size of the game
*
* @return the value of the attribute sizeOfGame
*/
public int getSize(){
return size;
}
/**
* returns the current color of a given dot in the game
*
* @param i
* the x coordinate of the dot
* @param j
* the y coordinate of the dot
* @return the status of the dot at location (i,j)
*/
public int getColor(int i, int j){
int color=0;
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
if (dots[x][y].getX()==i && dots[x][y].getY()==j) {
color=dots[x][y].getColor();
}
}
}
return color;
}
/**
* returns true is the dot is captured, false otherwise
*
* @param i
* the x coordinate of the dot
* @param j
* the y coordinate of the dot
* @return the status of the dot at location (i,j)
*/
public boolean isCaptured(int i, int j){
boolean capture = true;
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
if (dots[x][y].getX()==i && dots[x][y].getY()==j) {
capture=dots[x][y].isCaptured();
}
}
}
return capture;
}
/**
* Sets the status of the dot at coordinate (i,j) to captured
*
* @param i
* the x coordinate of the dot
* @param j
* the y coordinate of the dot
*/
public void capture(int i, int j){
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
if (dots[x][y].getX()==i && dots[x][y].getY()==j) {
dots[x][y].setCaptured(true);
}
}
}
}
/**
* Getter method for the current number of steps
*
* @return the current number of steps
*/
public int getNumberOfSteps(){
return steps;
}
/**
* Setter method for currentSelectedColor
*
* @param val
* the new value for currentSelectedColor
*/
public void setCurrentSelectedColor(int val) {
currentColor = val;
}
/**
* Getter method for currentSelectedColor
*
* @return currentSelectedColor
*/
public int getCurrentSelectedColor() {
return currentColor;
}
/**
* Getter method for the model's dotInfo reference
* at location (i,j)
*
* @param i
* the x coordinate of the dot
* @param j
* the y coordinate of the dot
*
* @return model[i][j]
*/
public DotInfo get(int i, int j) {
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
if (dots[x][y].getX()==i && dots[x][y].getY()==j) {
dot = dots[x][y];
}
}
}
return dot;
}
/**
* The metod <b>step</b> updates the number of steps. It must be called
* once the model has been updated after the payer selected a new color.
*/
public void step(){
steps++;
}
/**
* The metod <b>isFinished</b> returns true iff the game is finished, that
* is, all the dats are captured.
*
* @return true if the game is finished, false otherwise
*/
public boolean isFinished(){
boolean flag=true;
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
if (dots[x][y].isCaptured()==false) {
flag=false;
}
}
}
return flag;
}
/**
* Builds a String representation of the model
*
* @return String representation of the model
*/
public String toString(){
for (int x=0;x<size;x++) {
for (int y=0;y<size;y++) {
rep += "Dot("+dots[x][y].getX()+", "+ dots[x][y].getY()+", "+dots[x][y].getColor()+")";
}
}
return rep;
}
}
我的主要课程是Floodit.java
public class FloodIt {
/**
* <b>main</b> of the application. Creates the instance of GameController
* and starts the game. If a game size (<12) is passed as parameter, it is
* used as the board size. Otherwise, a default value is passed
*
* @param args
* command line parameters
*/
public static void main(String[] args) {
GameModel model = new GameModel(5);
model.reset();
System.out.println(model);
}
}
有人能告诉我为什么在调用reset（）方法时我的数组不会更新吗？
答案 0 :(得分：1)
您忘了将新的DotInfo（）对象分配给数组的每个位置。
该行：
dots[i][j] = new DotInfo(i, j, generator.nextInt(NUMBER_OF_COLORS)+1);
应该是：
assert page.find("#visu")[:class].include?("hidden") # this passes
assert page.has_xpath?("//*[@id='visu'][contains(@style, 'display: none')]")
click_button("Show/hide")
assert page.has_xpath?("//*[@id='visu'][contains(@style, 'display: block')]")
答案 1 :(得分：1)
在重置方法中你有一个for循环：
dots = new DotInfo[size][size];
for (int i=0;i<size;i++) {
for (int j=0;j<size;j++) {
new DotInfo(i, j, generator.nextInt(NUMBER_OF_COLORS)+1);
System.out.println(dots[i][j]);
}
}
这一行，
new DotInfo(i, j, generator.nextInt(NUMBER_OF_COLORS)+1);
正在做什么......
你正在创建一个对象，是的，但是没有把它分配给任何东西，所以这个对象迷失了....
您必须将该新对象分配给2D数组中的元素...
dots[i][j] = new DotInfo(i, j, generator.nextInt(NUMBER_OF_COLORS)+1);
需要初始化生成器对象：
public GameModel(int size) {
this.size = size;
generator = new Random();
}