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Author |
Topic: null pointer exception (Read 351 times) |
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jamest
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null pointer exception
« on: Jan 25th, 2005, 4:27am » |
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Below is my sketch. The complier complains with "java.lang.NullPointerException" at several points such as at PdeRuntime.start(PdeRuntime.java:346) OR at PdeEditor.doRun(PdeEditor.java:807). Can anyone help me out finding out what's wrong with the code? It seems to me that there's something wrong with my code in the setup() section?
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String lines[] = loadStrings("list.txt");
keyword[] keywords = new keyword[lines.length];
void setup() {
size(300,600);
background(255,255,102);
//set font
BFont keywordFont;
keywordFont = loadFont("Univers55.vlw.gz");
textFont(keywordFont, 22);
// setup the keyword array
for(int i=0; i<lines.length; i++) {
keywords[i] = new keyword(lines[i], (int)random(30,300), 15);
}
framerate(1);
}
void loop(){
rect(0,0,width,height);
background(255,255,102);
// draws each keyword
for(int i=0; i< lines.length; i++){
keywords[i].draw();
keywords[i].moveY(20);
}
}
class keyword{
String keywordString;
int posX, posY;
//constructor
keyword(String str, int posX, int posY){
keywordString = str;
this.posX = posX;
this.posY = posY;
}
void draw(){
text(keywordString, posX, posY);
}
void moveY(int mY) {
posY+=mY;
if (posY > height) {
posY = 0;
}
}
}
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thank you!
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eskimoblood
 
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Re: null pointer exception
« Reply #1 on: Jan 25th, 2005, 10:05am » |
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I believe you cannot load the String befor the setup methode
Code:
String [] lines;
keyword [] keywords;
void setup(){
size(200,400);
lines = loadStrings("list.txt");
keywords = new keyword[lines.length];
BFont keywordFont;
keywordFont = loadFont("Tahoma.vlw");
textFont(keywordFont, 22);
// setup the keyword array
for(int i=0; i<lines.length; i++) {
keywords[i] = new keyword(lines[i], (int)random(30,300), 15);
}
framerate(1);
}
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jamest
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Re: null pointer exception
« Reply #2 on: Jan 26th, 2005, 6:19am » |
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yeah, this works. many thanks!
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