Trouble creating a simple array in Java -

i'm having bit of trouble creating simple array in java random number generated every time loops. code follows:

public class q1 { public static void main(string[] args) {     scanner listscan = new scanner(system.in);     system.out.println("size of list sort?");         int j = listscan.nextint();       int listarray[] = new int[j];      (int = 0; <= j; i++){         listarray[i] = (int)(math.random() * 100 +1);     }      system.out.println(listarray);   } 

}

but code gives me this:

exception in thread "main" java.lang.arrayindexoutofboundsexception: 3     @ lab3.q1.main(q1.java:18)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:601)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:120) 

take @ part of code:

int listarray[] = new int[j];  (int = 0; <= j; i++){     listarray[i] = (int)(math.random() * 100 +1); } 

it should changed this:

int listarray[] = new int[j];  (int = 0; < j; i++){     listarray[i] = (int)(math.random() * 100 +1); } 

notice how <= changed <:

for (int = 0; <= j; i++){ 

vs:

for (int = 0; < j; i++){ 

for pretty coding, including java, counting starts @ 0. 5, in coding 4.

let's length of array 3, meaning contains 0, 1, , 2. so, when doing this:

for (int = 0; <= j; i++){ 

j = length of array, 3.

for (int = 0; <= 3; i++){ 

now, loop threw numbers 0, 1, 2, , 3. yet, our array not contain 3, contains 0, 1, , 2. so, if this:

for (int = 0; < j; i++){ 

j = 3

for (int = 0; < 3; i++){ 

using new code, loop threw 0, 1, , 2, same size of our array, 0, 1, , 2.