Thread: Null pointer error in java

This is my code
Code:
c1 { int h, double b}
c2 { int lb double[] y, c1[][] x}
class3{
obj = new c2();
obj.lb = Nb_int;
obj.y = new double[nb_int];
obj.x = new c1[nb_int][nb_int];
}
I get an error "null pointer", the error lies in assigning values to my obj.x, I think a pb of initialization, I'm gone the objects integrated in other objects. Any idea would be highly appreciated.

The init an array has more dimensions this fact in sequence Have a look at the following code. Hope this will help you.

Code:

Object t[][] = new Object[10][];
for (int i = 0; i < 10; i + +)
{
t[i] = new Object[10];
}

I have a code with me, please check if this helps

Code:

c1 { int h, double b}
c2 { int lb double[] y, c1[][] a}
class3{
obj = new c2();
obj.lb = Nb_int;
obj.y = new double[nb];
c1[][] a;
a = new c1[size1][];
for(int i = 0; I <a.length; I + +) {
a[i] = new c1[size2];
for(int j = 0J <a[i].lengthJ + +){
a[i][j] = new c1(-1, -1);
}
}