我的目标：相机正在尝试获取地形的位置并按照它进行直播，以便我可以看到它的位置，所以一旦我点击按钮，它就会在该位置添加地形。相机的原因是要找到我放置地形的位置，这样我就不会把它放在错误的位置，但我需要更新相机的位置，然后在输入内容时更新地形位置。
我的问题：好的问题是我有一个编辑gui来改变resiveTex所以当我这样做时我可以看到相机移动到地形的位置我添加＆＃34;直播＃34 ;。但是如果我输入一个新的值似乎打破了plsss通过告诉我发生了什么来帮助我我尝试查找它但它有点令人困惑！
错误：
Exception in thread "main" java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at entities.Camera.TerLocToFloat(Camera.java:39)
at entities.Camera.move(Camera.java:47)
at Run.MainLoop.main(MainLoop.java:146)
Window.java
public class Window {
public static boolean NewTerrainCamPos = false;
public static String textVal;
public static String textVal2;
public static String resiveTex = "1";
public static String resiveTex2;
public static final int Width = 1000;
public static final int Height = 720;
public static final int FPS_CAP = 120;
private static long lastFrameTime;
private static float delta;
public static void createDisplay(){
ContextAttribs attribs = new ContextAttribs(3,2).withForwardCompatible(true).withProfileCore(true);
try {
Canvas openglSurface = new Canvas();
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
//.............................
JMenuBar menuBar = new JMenuBar();
JMenu terrain = new JMenu("Terrain");
menuBar.add(terrain);
menuBar.add(terrain);
JMenuItem exit = new JMenuItem("Exit");
JMenuItem newTerrain = new JMenuItem("add Terrain");
JMenuItem editTerrain = new JMenuItem("Edit Terrain");
newTerrain.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
NewTerrainCamPos = true;
JFrame frame2 = new JFrame();
frame2.setVisible(true);
frame2.setSize(300, 300);
//...............................
GridLayout experimentLayout = new GridLayout(3,2);
frame2.setLayout(experimentLayout);
//.....................................
JLabel xCord = new JLabel("XCoords: ");
JLabel zCord = new JLabel("ZCoords: ");
JTextField text = new JTextField();
JTextField text2 = new JTextField();
text.addKeyListener(new KeyListener(){
@Override
public void keyTyped(KeyEvent arg0) {
resiveTex = text.getText();
}
@Override
public void keyPressed(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
}
});
resiveTex2 = text2.getText();
JButton createTerrain = new JButton("CreateTerrain");
createTerrain.addActionListener(new ActionListener(){
TIDF terrainFileID;
public void actionPerformed(ActionEvent a){
NewTerrainCamPos = false;
textVal = text.getText();
textVal2 = text2.getText();
TIDF.terrainIDFile();
}
});
frame2.add(xCord);
frame2.add(text);
frame2.add(zCord);
frame2.add(text2);
frame2.add(createTerrain);
}
});
editTerrain.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
JFrame frame3 = new JFrame();
frame3.setVisible(true);
frame3.setSize(300, 300);
//......................................
GridLayout experimentLayout = new GridLayout(3,2);
frame3.setLayout(experimentLayout);
//......................................
JButton select = new JButton("Select");
String terrainLocList[] =
{
"Item 1",
"Item 2",
"Item 3",
"Item 4"
};
JList list = new JList(terrainLocList);
list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
list.setVisibleRowCount(-1);
frame3.add(list);
frame3.add(select);
}
});
terrain.add(newTerrain);
terrain.add(editTerrain);
terrain.add(exit);
frame.setJMenuBar(menuBar);
//.........................................
frame.setSize(1100, 1000);
frame.add(openglSurface);
frame.setVisible(true);
openglSurface.setSize(1000, 720);
Display.setParent(openglSurface);
Display.setDisplayMode(new DisplayMode(Width, Height));
Display.create(new PixelFormat(), attribs);
frame.setTitle("Game editor 0.1");
} catch (LWJGLException e) {
e.printStackTrace();
}
GL11.glViewport(0, 0, Width, Height);
lastFrameTime = getCurrentTime();
}
public static boolean Returnboolean(){
return NewTerrainCamPos;
}
public static String getTex1() {
return textVal;
}
public static String getTex2(){
return textVal2;
}
public static String getTexupdate(){
return resiveTex;
}
public static String getTexupdate2(){
return resiveTex2;
}
public static void updateDisplay(){
Display.sync(FPS_CAP);
Display.update();
long currentFrameTime = getCurrentTime();
delta = (currentFrameTime - lastFrameTime)/1000f;
lastFrameTime = currentFrameTime;
}
public static float getFrameTimeSeconds(){
return delta;
}
public static void closeDisplay(){
Display.destroy();
}
private static long getCurrentTime(){
return Sys.getTime()*1000/Sys.getTimerResolution();
}
}
public class Camera {
private static final float TERRAIN_HEIGHT = 0;
private boolean FPS = false;
private boolean isInAir = false;
private float distanceFromPlayer = 40;
private float angleAroundPlayer = 0;
private Vector3f position = new Vector3f(0,0,0);
private float pitch = 20;
private float yaw;
private float roll;
private static final float RUN_SPEED = 20;
private static final float GRAVITY = -50;
private static final float JUMP_POWER = 30;
private float upwardsSpeed = 0;
private Player player;
public Camera(Player player){
this.player = player;
}
public void TerLocToFloat(){
String numberAsString = Window.getTexupdate();
int number = Integer.parseInt(numberAsString);
position.x = number;
position.z = 0;
}
public void move(){
if(Window.Returnboolean() == true){
AddTerrainCamPos();
TerLocToFloat();
} else{
viewState();
}
}
}
答案 0 :(得分：0)
Camera.java中的第39行
String numberAsString = Window.getTexupdate();
int number = Integer.parseInt(numberAsString);
numberAsString为空字符串，导致NFE
尝试使用以下方法通过将defaultValue设置为0
来解析整数public static int parseInteger( String string, int defaultValue ) {
try {
return Integer.parseInt(string);
}
catch (NumberFormatException e ) {
return defaultValue;
}
}