import java.util.*; ...
ArrayList<String> stringList = new ArrayList<String>();
stringList.add("Item");
这是我的 Java 代码。最后一行得到错误：“包 stringList 不存在”。
如何摆脱此错误并开始将项目添加到我的列表中？我只能想象我错过了一些非常简单的东西。提前致谢。
部分根据请求，以下是我的整个代码。它不完整，但我被困在上述问题上。
package gorobot_m5d25y2013;
//import java.util.List;
import java.util.ArrayList;
class Engine { // The Engine will show the best positions on the board given a particular board setup.
// Some project-wide constants and variables.
final int BLACK = 1; // Black go pieces... black goes first in the game of go, unless black has
// a 2 stone or greater handicap.
final int WHITE = 2; // White go pieces... usually goes second in the game.
final int EMPTY = 0; // An empty space, no piece is on it.
final int VIRTUAL = -1; // This is a space outside of the board that can never be played on,
// but is useful if there's ever an issue of checking something for
// the board which would normally be out of bounds.
final int BLACKS_TURN = 1;
final int WHITES_TURN = 2;
final int BOARD_SIZE = 19; // Access with Global.BOARD_SIZE ... this is the width of the board.
final int VIRTUAL_BOARD_BORDER = 10; // This is the width of the empty space around each of the four sides of the board.
int whoseTurn; // 1 is blacks turn, 2 is white's turn.
int totalGames = 0;
int blackWins = 0;
static long groupCounter = 1; // Used in inner class group.
int positionNumber = 1; // Used in inner class group and position.
int[][] boardValues = new int[BOARD_SIZE][BOARD_SIZE]; // boardValues is the win probability for each position on the board.
Engine() {
Board firstMove = new Board();
}
int oppositeWhoseTurn() {
int opposite = 0;
if (whoseTurn == BLACKS_TURN) {
opposite = WHITES_TURN;
}
if (whoseTurn == WHITES_TURN) {
opposite = BLACKS_TURN;
}
if (opposite == 0) {
System.out.println("An error with the opposite variable has occured.");
}
return opposite;
}
int regPos(int boardPosition) { // This Regulates Position-Ex. takes any of the normal board positions, for example,
// 1-19, and sets it to the virtual, larger board. So a Position 1 move will be position 9 with a 10 space buffer.
int realBoardPosition = (boardPosition + (VIRTUAL_BOARD_BORDER - 1));
return realBoardPosition;
}
class Board { // The board is composed of positions and groups. At first it is 2 groups, the real and the virtual
int virtualPlusRegularBoardSize = (BOARD_SIZE + (VIRTUAL_BOARD_BORDER * 2));
Position[][] point = new Position[virtualPlusRegularBoardSize][virtualPlusRegularBoardSize];
Group food = new Group();
Board() {
for (int horizontal = 0; horizontal < virtualPlusRegularBoardSize; horizontal++) {
for (int vertical = 0; vertical < virtualPlusRegularBoardSize; vertical++) {
point[horizontal][vertical] = new Position(horizontal, vertical);
}
}
for (int horizontal = 1; horizontal <= BOARD_SIZE; horizontal++) {
for (int vertical = 1; vertical <= BOARD_SIZE; vertical++) {
point[regPos(horizontal)][regPos(vertical)].setType(EMPTY);
}
}
}
}
class Group { // Each Group is composed of positions
long groupNumber;
int sizeOfGroup = 1;
Integer[] ints = new Integer[1];
ArrayList<String> stringList = new ArrayList<String>();
stringList.add ("Item");
//List<Position> positionList = new ArrayList<>();
//positionList.size ();
//positionList.add ();
//positionList.remove("F");
Group() {
groupNumber = groupCounter;
groupCounter++;
}
void setGroupNumber(int newGroupNumber) {
sizeOfGroup = newGroupNumber;
}
long getGroupNumber() {
return groupNumber;
}
void setSizeOfGroup(int newGroupSize) {
sizeOfGroup = newGroupSize;
}
int getSizeOfGroup() {
return sizeOfGroup;
}
void addPositionToGroup(Position point) {
}
}
class Position { // Each position is either Empty, Black, White, or Virtual.
int pieceType; // VIRTUAL means it's not even a board position, at first all spaces are like this...
// but eventually, the positions on the actual board will all be empty - 0, and then
// will start filling with black - 1 and white - 2 pieces.
boolean legalMove; // This tells us whether this space is a legal move.
int numberOfLiberties = 2;
int virtualHorizontal;
int virtualVertical;
Position() {
pieceType = VIRTUAL;
legalMove = false;
}
Position(int horizontal, int vertical) {
pieceType = VIRTUAL;
legalMove = true;
virtualHorizontal = horizontal;
virtualVertical = vertical;
}
void setType(int setType) {
pieceType = setType;
////// Add in here the 4 surrounding sides and make those these variables accessible from the piece class.
if (setType == BLACK) {
}
if (setType == WHITE) {
}
}
int getType() {
return pieceType;
}
}
}
/**
*
* @author Eric Martin
*/
public class GoRobot_m5d25y2013 {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Engine firstEngine = new Engine();
}
}
这些是我的错误：
run:
Exception in thread "main" java.lang.ClassFormatError: Method "<error>" in class gorobot_m5d25y2013/Engine$Group has illegal signature "(Ljava/lang/Object;)LstringList/add;"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at gorobot_m5d25y2013.Engine$Board.<init>(GoRobot_m5d25y2013.java:73)
at gorobot_m5d25y2013.Engine.<init>(GoRobot_m5d25y2013.java:46)
at gorobot_m5d25y2013.GoRobot_m5d25y2013.main(GoRobot_m5d25y2013.java:181)
Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)