Static method reference example.

StaticMethodReference.java

public class StaticMethodReference {
  
  public static void main(String[] args) {
    
    Random random = new Random();
    Set<Integer> theIntSet = new HashSet<>();
    for(int i = 0; i < 10;i++) {
      theIntSet.add(Integer.valueOf(random.nextInt(100)));
    }
        
    theIntSet.forEach(ThatClass::thatIs);
  }
    
  public static class ThatClass {
    public static void thatIs(int i) {
      System.out.printf("That is %d%n", i);
    }
  }
}