所以我正在做一个项目，在那里我要创建一个不同的＆＃34;小动物＆＃34;的2d模拟。这些生物在GUI上相互交互，并将互相争斗。我的问题是我使用的是一个名为 Simulation 的类，用于模拟二维环境。在本课程中，我使用的是诸如
之类的行if (c.getSpecies() == Species.ANT)
//do something
这给了我一个错误，告诉我无法找到符号Species或ANT。我很确定这是因为模拟没有来自我的主* GVcritter **类的任何继承，模拟不应该有任何继承。话虽如此，我不太确定如何在不使用上述if语句的情况下实现此目的。
主要 GVcritter 类：
import java.awt.*;
/***********************************************************
GVcritter represents a generic critter with several
characteristics: location, species, color and the number
of steps taken. All other critters in the simulation
extend this class and add a few methods.
@author Scott Grissom
@version August 2016
***********************************************************/
public abstract class GVcritter {
/** critter location */
protected Location myLocation;
/** critter color */
private Color myColor;
/** critter species */
private Species mySpecies;
/** number of steps taken during the simulation */
protected int steps;
/***********************************************************
These enubmerated types are used throughout the simulation
classes.
***********************************************************/
public static enum Direction {
NORTH, SOUTH, EAST, WEST, NONE
};
public static enum Attack {
ROAR, POUNCE, SCRATCH, FORFEIT
};
public static enum Species {
NONE, ANT, BIRD, HIPPO, VULTURE, TIGER
};
/***********************************************************
These abstract methods MUST BE IMPLEMENTED by all classes
that extend GVcritter.
***********************************************************/
public abstract Attack getAttack(GVcritter opponent);
public abstract Direction getMoveDirection();
/***********************************************************
Instantiate and initialize the instance variables.
@param l location of the critter
***********************************************************/
public GVcritter(Location loc){
myLocation = loc;
myColor = Color.WHITE;
mySpecies = Species.NONE;
steps = 0;
}
/***********************************************************
Returns the critter species
@returns the species
***********************************************************/
public final Species getSpecies(){
return mySpecies;
}
/***********************************************************
Sets the critter species
@param s the species
***********************************************************/
public final void setSpecies(Species s){
mySpecies = s;
}
/***********************************************************
Returns the critter color
@returns the color
***********************************************************/
public final Color getColor(){
return myColor;
}
/***********************************************************
Sets the critter color
@param c the color
***********************************************************/
public final void setColor(Color c){
myColor = c;
}
/***********************************************************
Sets the critter location
@param loc the location
***********************************************************/
public final void setLocation(Location loc){
myLocation = loc;
}
/***********************************************************
Returns the critter location
@returns the location
***********************************************************/
public final Location getLocation(){
return myLocation;
}
}
模拟类：
import java.util.*;
import javax.swing.*;
import java.awt.*;
/****************************************************
* Simulates a 2D world of critters that move around
* and fight if they inhabit the same location.
*
* @author Scott Grissom
* @version August 2016
***************************************************/
public class Simulation extends GVcritter{
Random gen = new Random();
/** a 2D world of critters */
private GVcritter[][] theWorld;
/** a collection of all live critters */
private ArrayList <GVcritter> allCritters;
/** control size of the world */
private final int ROWS=50, COLUMNS=70, SIZE=10;
/** number of Ants alive in the simulation */
private int numAnts;
private int stepCount, numBirds, numHippos, numVultures, numTigers;
/****************************************************
Constructor instantiates and initializes all
instance members.
****************************************************/
public Simulation(){
theWorld = new GVcritter[ROWS][COLUMNS];
allCritters = new ArrayList<GVcritter>();
numAnts=0;
stepCount = 0;
numAnts = 0;
numBirds = 0;
numHippos = 0;
numVultures = 0;
// set the appropriate size of the invisibile drawing area
setPreferredSize(new Dimension(COLUMNS*SIZE, ROWS*SIZE));
}
/****************************************************
Add the requested number of Ants into the simulation.
Repeatedly ask for a random location that is free.
Increment the number of Ants in the simulation.
@param num number of ants
****************************************************/
public void addAnts(int num){
numAnts += num;
for(int i=1;i<=num;i++){
// create a new Ant at an open location
Location loc = getOpenLocation();
Ant c = new Ant(loc);
placeCritter(c);
}
}
public void addBirds(int num) {
numBirds += num;
for (int i=1; i<=num; i++)
{
Location loc = getOpenLocation();
Bird c = new Bird(loc);
placeCritter(c);
}
}
public void addHippos(int num) {
numHippos += num;
for (int i=1; i<=num; i++)
{
Location loc = getOpenLocation();
Hippo c = new Hippo(loc);
placeCritter(c);
}
}
public void addVultures(int num) {
numVultures += num;
for (int i=1; i<=num; i++)
{
Location loc = getOpenLocation();
Vulture c = new Vulture(loc);
placeCritter(c);
}
}
public void addTigers(int num) {
numTigers += num;
for (int i=1; i<=num; i++)
{
Location loc = getOpenLocation();
Tiger c = new Tiger(loc);
placeCritter(c);
}
}
/******************************************************
Move forward on step of the simulation
*****************************************************/
/* public void oneStep(){
// shuffle the arraylist of critters for better performance
Collections.shuffle(allCritters);
stepCount++;
// step throgh all critters using traditional for loop
for(int i=0; i<allCritters.size(); i++){
GVcritter attacker = allCritters.get(i);
// what location does critter want to move to?
GVcritter.Direction dir = attacker.getMoveDirection();
Location previousLoc = attacker.getLocation();
Location nextLoc = getRelativeLocation(previousLoc, dir);
// who is at the next location?
GVcritter defender = theWorld[nextLoc.getRow()][nextLoc.getColumn()];
// no critters here so OK for critter 1 to move
if(defender == null){
theWorld[nextLoc.getRow()][nextLoc.getColumn()] = attacker;
attacker.setLocation(nextLoc);
theWorld[previousLoc.getRow()][previousLoc.getColumn()] = null;
// both critters the same species so peacefully bypass
}else if(attacker.getSpecies() == defender.getSpecies()){
// update critter locations
attacker.setLocation(nextLoc);
defender.setLocation(previousLoc);
// update positions in the world
theWorld[nextLoc.getRow()][nextLoc.getColumn()] = attacker;
theWorld[previousLoc.getRow()][previousLoc.getColumn()] = defender;
//different species so they fight at location of critter 2
}else if(attacker.getSpecies() != defender.getSpecies()){
fight(attacker, defender);
}
}
// update drawing of the world
repaint();
}*/
/******************************************************
Step through the 2D world and paint each location white
(for no critter) or the critter's color. The SIZE of
each location is constant.
@param g graphics element used for display
*****************************************************/
public void paintComponent(Graphics g){
for(int row=0; row<ROWS; row++){
for(int col=0; col<COLUMNS; col++){
GVcritter c = theWorld[row][col];
// set color to white if no critter here
if(c == null){
g.setColor(Color.WHITE);
// set color to critter color
}else{
g.setColor(c.getColor());
}
// paint the location
g.fillRect(col*SIZE, row*SIZE, SIZE, SIZE);
}
}
}
public String getStats() {
return "Steps: " + stepCount + "\nAnts: " + numAnts + "\nBirds: " + numBirds + "\nHippos: " + numHippos + "\nVultures: " + numVultures;
}
private Location getOpenLocation() {
int randRow, randCol;
boolean isEmpty = false;
Location loc = new Location();
do {
randRow = gen.nextInt(50);
randCol = gen.nextInt(70);
if (theWorld[randRow][randCol] == null)
isEmpty = true;
} while (!isEmpty);
loc.setRow(randRow);
loc.setColumn(randCol);
return loc;
}
private void placeCritter(GVcritter c) {
Location critterLoc = c.getLocation();
int row = critterLoc.getRow(), col = critterLoc.getColumn();
allCritters.add(c);
theWorld[row][col] = c;
}
private Location getRelativeLocation(Location loc, GVcritter.Direction d) {
int row = loc.getRow(), col = loc.getColumn();
Location neighbor = new Location();
switch(d) {
case NORTH:
if (row == 0)
{
neighbor.setRow(ROWS);
neighbor.setColumn(col);
}
else
{
neighbor.setRow(row - 1);
neighbor.setColumn(col);
}
break;
case EAST:
if (col == COLUMNS)
{
neighbor.setRow(row);
neighbor.setColumn(0);
}
else
{
neighbor.setRow(row);
neighbor.setColumn(col + 1);
}
break;
case SOUTH:
if (row == ROWS)
{
neighbor.setRow(0);
neighbor.setColumn(col);
}
else
{
neighbor.setRow(row - 1);
neighbor.setColumn(col);
}
break;
case WEST:
if (col == 0)
{
neighbor.setRow(row);
neighbor.setColumn(COLUMNS);
}
else
{
neighbor.setRow(row);
neighbor.setColumn(col - 1);
}
break;
}
return neighbor;
}
public void reset() {
for (int i=0; i<ROWS; i++)
for (int j=0; i<COLUMNS; j++)
theWorld[i][j] = null;
allCritters.clear();
numAnts = 0;
stepCount = 0;
numBirds = 0;
numHippos = 0;
numVultures = 0;
}
private void critterDies(GVcritter c) {
int location;
if (c.getSpecies() == Species.ANT) {
numAnts--;
location = 0;
for (GVcritter e: allCritters)
{
if (e.get(location) == c)
e.remove(location);
location++;
}
}
else if (c == Species.BIRD) {
numBirds--;
location = 0;
for (GVcritter e: allCritters)
{
if (e.get(location) == c)
e.remove(location);
location++;
}
}
else if (c == Species.HIPPO) {
numHippos--;
location = 0;
for (GVcritter e: allCritters)
{
if (e.get(location) == c)
e.remove(location);
location++;
}
}
else if (c == Species.VULTURE) {
numVultures--;
location = 0;
for (GVcritter e: allCritters)
{
if (e.get(location) == c)
e.remove(location);
location++;
}
}
else if (c == Species.TIGER) {
numTigers--;
location = 0;
for (GVcritter e: allCritters)
{
if (e.get(location) == c)
e.remove(location);
location++;
}
}
}
public void fight(GVcritter attacker, GVcritter defender) {
Location attackLoc = attacker.getLocation();
Location defendLoc = defender.getLocation();
int attackRow = attackLoc.getRow(), attackCol = attackLoc.getColumn();
int defendRow = defendLoc.getRow(), defendCol = defendLoc.getColumn();
theWorld[attackRow][attackCol] = null;
if (attackerWins(attacker, defender))
{
//critterDies(defender);
theWorld[defendRow][defendCol] = attacker;
}
else
{
//critterDies(attacker);
}
}
private boolean attackerWins(GVcritter attacker, GVcritter defender) {
if (attacker.getAttack(defender) == Attack.POUNCE && defender.getAttack(attacker) == Attack.ROAR)
return true;
else if (attacker.getAttack(defender) == Attack.POUNCE && defender.getAttack(attacker) == Attack.SCRATCH)
return false;
else if (attacker.getAttack(defender) == Attack.SCRATCH && defender.getAttack(attacker) == Attack.ROAR)
return false;
else if (attacker.getAttack(defender) == Attack.SCRATCH && defender.getAttack(attacker) == Attack.POUNCE)
return true;
else if (attacker.getAttack(defender) == Attack.ROAR && defender.getAttack(attacker) == Attack.SCRATCH)
return true;
else if (attacker.getAttack(defender) == Attack.ROAR && defender.getAttack(attacker) == Attack.POUNCE)
return false;
else
{
if (Math.random() < 0.5)
return true;
else
return false;
}
}
}
我的问题出现在我的critterDies（），fight（）和attackerWins（）方法中。任何帮助表示赞赏！
答案 0 :(得分：1)
Species.ANT不是顶级课程。以来
它是GVcritter的内部类，改变
Species.ANT至GVcritter.Species.ANT。