# V6109\. Potentially predictable seed is used in pseudo\-random number generator\.

This diagnostic rule detects cases where a pseudo\-random number generator is used\. It may result in insufficient randomness or predictability of the generated number\.

**Case 1\.**

Creating a new object of the 'Random' type every time a random value is required\. This is inefficient and may result in creating numbers that are not random enough, depending on the JDK\.

Here is an example:

```cpp
public void test() {
  Random rnd = new Random();
}
```

For a more efficient and random distribution, create an instance of the 'Random' class, save it, and reuse it\.

```cpp
static Random rnd = new Random();

public void test() {
  int i = rnd.nextInt();
}
```

**Case 2\.**

The analyzer detected suspicious code that initializes the pseudo\-random number generator with a constant value\.

```cpp
public void test() {
  Random rnd = new Random(4040);
}
```

Numbers generated by such a generator are predictable — they are repeated every time the program runs\. To avoid this, do not use a constant number\. For example, you can use the current system time instead:

```cpp

static Random rnd = new Random(System.currentTimeMillis());

public void test() {
  int i = rnd.nextInt();
}
```