what's the meaning of " a[j]++?, thanks

[Tu Ran]

class A {
static void method(int [] a){
int j=1;
a[j]++; //I can't understand this sentence?
}
public static void main(String args[]) {
int [] b=new int[5];
method(b);
System.out.println(b[1]);
}
}

[Valentin Crettaz]

a[j]++ basically increments the value of the j-th element in array a.
Here, we create a new int array of length 5. Then we pass the array to method(). Within method(), we increment its 1st element from 0 to 1 and then finally in main() we print that first element which is now 1.

[Tu Ran]

Thanks my friends--Valentin Crettaz
I see~~