Concurrency Risk With Compound Conditions

Consider the following ConditionCheck class. What is the primary concurrency risk associated with the compound boolean expression in the useResource method?

public class ConditionCheck {
    private int resource = 0;
    
    public void useResource() {
        if (resource > 0 && resource < 100) {
            resource += 10;
            System.out.println("Resource updated: " + resource);
        }
    }
    
    public void setResource(int value) {
        resource = value;
    }
    
    public static void main(String[] args) {
        ConditionCheck cc = new ConditionCheck();
        Thread t1 = new Thread(() -> {
            for(int i = 0; i < 10; i++){
                cc.useResource();
            }
        });
        Thread t2 = new Thread(() -> cc.setResource(50));
        t1.start(); 
        t2.start();
    }
}