parseFloat problems

OpenGL Development
#1

can anyone tell me why i would be getting the following errors:-

--------------------Configuration: j2sdk1.4.2_04 --------------------
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:96: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float x1 = Float.parseFloat(coords.elementAt(x));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:97: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float y1 = Float.parseFloat(coords.elementAt(x+1));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:98: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float z1 = Float.parseFloat(coords.elementAt(x+2));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:100: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float x2 = Float.parseFloat(coords.elementAt(x+3));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:101: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float y2 = Float.parseFloat(coords.elementAt(x+4));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:102: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float z2 = Float.parseFloat(coords.elementAt(x+5));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:104: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float x3 = Float.parseFloat(coords.elementAt(x+6));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:105: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float y3 = Float.parseFloat(coords.elementAt(x+7));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:106: parseFloat(java.lang.String) in java.lang.Float cannot be applied to (java.lang.Object)
Float z3 = Float.parseFloat(coords.elementAt(x+8));
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:108: glVertex3f(float,float,float) in org.lwjgl.opengl.GL11 cannot be applied to (java.lang.Float,java.lang.Float,java.lang.Float)
GL11.glVertex3f(x1, y1, z1);
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:109: glVertex3f(float,float,float) in org.lwjgl.opengl.GL11 cannot be applied to (java.lang.Float,java.lang.Float,java.lang.Float)
GL11.glVertex3f(x2, y2, z2);
^
C:\Documents and Settings\Danny\Desktop\OpenGLWindow.java:110: glVertex3f(float,float,float) in org.lwjgl.opengl.GL11 cannot be applied to (java.lang.Float,java.lang.Float,java.lang.Float)
GL11.glVertex3f(x3, y3, z3);
^
12 errors

Process completed.

from the following code:-

GL11.glBegin(GL11.GL_TRIANGLES);

  for (int x = 0;x<coords.size();x+=9) {
        Float x1 = Float.parseFloat(coords.elementAt(x));
        Float y1 = Float.parseFloat(coords.elementAt(x+1));
        Float z1 = Float.parseFloat(coords.elementAt(x+2));
        
        Float x2 = Float.parseFloat(coords.elementAt(x+3));
        Float y2 = Float.parseFloat(coords.elementAt(x+4));
        Float z2 = Float.parseFloat(coords.elementAt(x+5));
        
        Float x3 = Float.parseFloat(coords.elementAt(x+6));
        Float y3 = Float.parseFloat(coords.elementAt(x+7));
        Float z3 = Float.parseFloat(coords.elementAt(x+8));
        
        GL11.glVertex3f(x1, y1, z1);
        GL11.glVertex3f(x2, y2, z2);
        GL11.glVertex3f(x3, y3, z3);

  }            
        GL11.glEnd();

thanks in advance to all who reply
Danny :slight_smile:

#2

because elementAt returns Object not String. You need to cast it.

#3

how?

#4

i’ve tried doing a toString() but it didn’t work

#5

(String)coords.elementAt(x)

I’ll try to sound as diplomatic as possible, but how are you planning on displaying 3D graphics and loading models in a language where you don’t understand the basics?

#6

Float x1 = Float.parseFloat(coords.elementAt(x));

… ::slight_smile:

Float.parseFloat(someString) returns a float and not a Float.

#7

i’m sorry but i’ve been given this as a project and i’m just trying to do the best i can so that it gets handed in on time

#8

It’s this time of year again :slight_smile: Frantic students flooding the forums before their project have to be turned in.

Good luck! When is the deadline?

#9

got until just after new year but i’ve only just got my models to load in and now that i’m having performance problems i decided to use a display list and now nothing works!!! :frowning:

keep getting the following error and i dont know why!

org.lwjgl.opengl.OpenGLException: Invalid operation (1282)
at org.lwjgl.opengl.Util.checkGLError(Unknown Source)
at org.lwjgl.opengl.Display.update(Unknown Source)
at OpenGLWindow.run(OpenGLWindow.java:49)
at OpenGLWindow.main(OpenGLWindow.java:39)
Press any key to continue…

arrgh!

#10

Is there some reason you don’t want to use a scene graph, it’d be much quicker and examples already exist to follow?

Kev