我遇到一个问题，即Eclipse中没有识别其他类的方法，即使所有其他方法都是。我不知道为什么会发生这种情况，也无法弄明白。我尝试这样做时收到错误The method getData() is undefined for the type TMXReader.TMXHandler：
package tiled.simple.reader;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import tiled.simple.core.Map;
import tiled.simple.core.MapLayer;
import tiled.simple.core.TileSet;
import davidiserovich.TMXLoader.TMXHandler;
import davidiserovich.TMXLoader.TileMapData;
TMXHandler handler = new TMXHandler();
handler.getData();
这是TMXHandler类：
package davidiserovich.TMXLoader;
import java.util.HashMap;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
//import android.sax.StartElementListener;
public class TMXHandler extends DefaultHandler {
/*
* This is an SAX2 XML parser that interprets the input TMX file and creates
* a TileMapData object.
*/
// NOTE: Map Object loading is not yet implemented
// Markers for which tag we're in
private boolean inTileSet, inTile, inLayer, inData, inObjectGroup,
inProperties;
// ID of the current tile that we're adding properties to.
// This is actually an OFFSET from firstGID of the tile in
// the tileset. Beware.
private String currentTileID;
private String currentObjectGroupName;
TileMapData.TMXObject currentObject;
TileMapData.TileSet currentTileSet;
TileMapData.Layer currentLayer;
HashMap<String, HashMap<String, String>> currentTileSetProperties;
HashMap<String, String> currentLayerProperties;
private TileMapData data;
/*
* These fields hold the buffer and data to help decode the long stream of
* gids in the data field
*/
private char buffer[];
private int bufferIndex;
private int currentX;
private int currentY;
public int MAX_INT_DECIMAL_LENGTH = 10;
public TMXHandler() {
super();
buffer = new char[MAX_INT_DECIMAL_LENGTH];
bufferIndex = 0;
currentX = 0;
currentY = 0;
}
public TileMapData getData() {
return data;
}
@Override
public void startDocument() throws SAXException {
data = new TileMapData();
}
@Override
public void endDocument() throws SAXException {
}
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException {
if (localName.equals("map")) {
// inMap = true;
// Check that the orientation is orthogonal
if (!(atts.getValue("orientation").equals("orthogonal"))) {
throw new SAXException(
"Unsupported orientation. Parse Terminated.");
}
data.orientation = atts.getValue("orientation");
data.height = Integer.parseInt(atts.getValue("height"));
data.width = Integer.parseInt(atts.getValue("width"));
data.tilewidth = Integer.parseInt(atts.getValue("tilewidth"));
data.tileheight = Integer.parseInt(atts.getValue("tileheight"));
// data.sectionId = atts.getValue("id");
} else if (localName.equals("tileset")) {
inTileSet = true;
currentTileSet = new TileMapData.TileSet();
currentTileSet.firstGID = Integer.parseInt(atts
.getValue("firstgid"));
currentTileSet.tileWidth = Integer.parseInt(atts
.getValue("tilewidth"));
currentTileSet.tileHeight = Integer.parseInt(atts
.getValue("tileheight"));
currentTileSet.name = atts.getValue("name");
currentTileSetProperties = new HashMap<String, HashMap<String, String>>();
} else if (inTileSet && localName.equals("image")) {
currentTileSet.ImageFilename = atts.getValue("source");
currentTileSet.imageWidth = Integer
.parseInt(atts.getValue("width"));
currentTileSet.imageHeight = Integer.parseInt(atts
.getValue("height"));
} else if (inTileSet && localName.equals("tile")) {
inTile = true;
currentTileID = atts.getValue("id");
} else if (inTile && localName.equals("properties")) {
inProperties = true;
currentTileSetProperties.put(currentTileID,
new HashMap<String, String>());
} else if (inLayer && localName.equals("properties")) {
inProperties = true;
} else if (inTile && inProperties && localName.equals("property")) {
(currentTileSetProperties.get(currentTileID)).put(
atts.getValue("name"), atts.getValue("value"));
} else if (inLayer && inProperties && localName.equals("property")) {
currentLayerProperties.put(atts.getValue("name"),
atts.getValue("value"));
} else if (localName.equals("layer")) {
inLayer = true;
currentLayer = new TileMapData.Layer();
currentLayer.name = atts.getValue("name");
currentLayer.width = Integer.parseInt(atts.getValue("width"));
currentLayer.height = Integer.parseInt(atts.getValue("height"));
if (atts.getValue("opacity") != null)
currentLayer.opacity = Double.parseDouble(atts
.getValue("opacity"));
currentLayer.tiles = new long[currentLayer.height][currentLayer.width];
currentLayerProperties = new HashMap<String, String>();
} else if (localName.equals("data")) {
/*
* Data is loaded directly into the int array in characters() We
* just check if the encoding is supported here.
*/
inData = true;
String encoding = atts.getValue("encoding");
if (!encoding.equals("csv")) {
throw new SAXException(
"Unsupported encoding. Parse Terminated.");
}
} else if (localName.equals("objectgroup")) {
inObjectGroup = true;
currentObjectGroupName = atts.getValue("name");
} else if (localName.equals("object")) {
currentObject = new TileMapData.TMXObject();
currentObject.name = atts.getValue("name");
currentObject.type = atts.getValue("type");
currentObject.x = Integer.parseInt(atts.getValue("x"));
currentObject.y = Integer.parseInt(atts.getValue("y"));
currentObject.width = Integer.parseInt(atts.getValue("width"));
currentObject.height = Integer.parseInt(atts.getValue("height"));
if (inObjectGroup) {
currentObject.objectGroup = currentObjectGroupName;
} else {
currentObject.objectGroup = null;
}
}
}
@Override
public void endElement(String namespaceURI, String localName, String qName)
throws SAXException {
if (localName.equals("map")) {
// inMap = false;
} else if (localName.equals("tileset")) {
inTileSet = false;
currentTileSet.properties = currentTileSetProperties;
currentTileSetProperties = null;
data.tilesets.add(currentTileSet);
currentTileSet = null; // Clear it just in case
} else if (localName.equals("tile")) {
inTile = false;
currentTileID = "-1"; // -1 won't be produced when searching for
// properties. Just a safeguard for
// improperly formatted files.
} else if (localName.equals("properties")) {
inProperties = false;
} else if (localName.equals("layer")) {
inLayer = false;
currentLayer.properties = currentLayerProperties;
data.layers.add(currentLayer);
currentLayer = null; // Clear it just in case
} else if (localName.equals("data")) {
inData = false;
// In case we missed the last entry (no non-numeral chars before tag
// end)
if (bufferIndex > 0) {
currentLayer.tiles[currentY][currentX] = Long
.parseLong(new String(buffer, 0, bufferIndex));
}
// Clear buffer
bufferIndex = 0;
currentX = 0;
currentY = 0;
} else if (localName.equals("objectgroup")) {
inObjectGroup = false;
} else if (localName.equals("object")) {
data.objects.add(currentObject);
}
}
@Override
public void characters(char ch[], int start, int length) {
/*
* Java has no unsigned types, so we have to use a long instead of an
* int so we can "simulate" an unsigned int. Disgusting. Anyway, we're
* going to add the numbers from the character stream to a buffer until
* we hit a comma, at which point we empty the buffer and convert it to
* a long, and dump it into the array. These are raw, so the horizontal
* and vertical flip bits may be set - to get the actual GID number,
* we'll use TileMapData's getGIDAt(x, y), which will mask it properly.
*/
if (inData) {
for (int i = 0; i < length; i++) {
if (ch[start + i] <= '9' && ch[start + i] >= '0') {
buffer[bufferIndex] = ch[start + i];
// Log.d("Wrote to index", String.valueOf(bufferIndex));
bufferIndex++;
} else {
// When we hit a comma or any non-number character, empty
// the buffer and enter the relevant
// GID into the data field
// int what = Integer.parseInt(new String(buffer, 0,
// bufferIndex));
// Log.d("Number", new String(buffer, 0, bufferIndex));
String nextNumber = new String(buffer, 0, bufferIndex);
if ((nextNumber != null) && ((nextNumber.trim()) != "")
&& (bufferIndex != 0)) {
// Log.d("Checking", nextNumber + " yes");
currentLayer.tiles[currentY][currentX] = Long
.parseLong(nextNumber);
bufferIndex = 0;
// Move to the next tile
if (currentX < (currentLayer.width - 1)) {
currentX++;
} else if (currentY < (currentLayer.height - 1)) {
currentX = 0;
currentY++;
}
}
}
}
}
}
}
自动完成将所有其他方法显示为可用，但出于某种原因getData＆＃34;不存在＆＃34; ...
我确信这对经验丰富的Java程序员来说很明显，但我不知道为什么会发生这种情况......所以，如果有人能告诉我原因，我会感激不尽。谢谢！
答案 0 :(得分：6)
改变这个：
TMXHandler handler = new TMXHandler;
对此：
TMXHandler handler = new TMXHandler();
修改
如果它只是一个错字问题......如果你的问题已经完成......你可能忘了把它放在课堂上？ ：其中
import davidiserovich.TMXLoader.TMXHandler;
public class Main {
public static void main(String[] args) {
TMXHandler handler = new TMXHandler();
handler.getData();
}
}
答案 1 :(得分：0)
你必须创建对象。你忘了（）
TMXHandler handler = new TMXHandler();
答案 2 :(得分：0)
您确定引用TMXHandler类的java代码在运行时具有正确的TMXHandler.class文件吗？这可能是由未定义TMXHandler.class方法的旧getData()引起的。
也许尝试一下干净的构建
答案 3 :(得分：0)
TMXHandler handler = new TMXHandler;
上述行是罪魁祸首。
- 当我们在Class name上调用new时，它始终伴有()作为 postfix ，这表示该类的构造函数的对象现在在堆上创建。
- 此行有机会介入，在Actual object分配给Object reference variable之前初始化对象的状态。
所以应该......
TMXHandler handler = new TMXHandler();
答案 4 :(得分：0)
我解决了......原来一个项目已经有一个名为TMXHandler的类，所以它指的是那个，而不是我的其他项目......一个非常愚蠢的错误。 ：