I want to make a 2D array of Arrays, each filled with another object. What I have so far is:
class CustomCache{
boolean dirty = false;
int age = 0;
String addr;
public CustomCache(boolean a, String b, int c){
dirty = a;
addr = b;
age = c;
}
}
class Setup {
int wpb;
CustomCache[] wpbArray = new CustomCache[wpb];
public Setup(int a){
wpb = a;
}
}
Setup[][] array = new Setup[numSets][numBlocks];
for(int i=0; i<numSets; i++){
for(int j=0; j<numBlocks; j++){
array[i][j] = new Setup(wpb);
for(int k=0; k<wpb; k++){
array[i][j].wpbArray[k] = new CustomCache(false, "", 0);
}
}//end inner for
}//end outer loop
I keep getting a
java.lang.ArrayIndexOutOfBoundsException: 0
Which means the array is empty. Any idea of how to fix it?
This is the problem:
class Setup {
int wpb;
CustomCache[] wpbArray = new CustomCache[wpb];
public Setup(int a){
wpb = a;
}
}
This line:
CustomCache[] wpbArray = new CustomCache[wpb];
runs before the body of the constructor - while wpb
is still 0. You want:
class Setup {
int wpb;
CustomCache[] wpbArray;
public Setup(int a) {
wpb = a;
wpbArray = new CustomCache[wpb];
}
}
(I also suggest changing to more meaningful names, and using private final fields, but that's a different matter.)
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