Boolean Supplier Java wait until condition is true

Question

I am trying to get to wait until there exists the condition (theOne, that I am waiting for) in the list of areHere. I am trying to work with BooleanSupplier but can't get it to work, not sure where is my mistake:

String theOne = "pika";

final BooleanSupplier itsHere = () -> {
    List <String> areHere = getSomeList();
    for (String eachOne : areHere) {
        if(eachOne.equals(theOne)) { return TRUE; }
    } return FALSE;
};

Answer 1

you need to execute supplier. You just declared supplier. But not executed.

import java.util.function.BooleanSupplier;
import java.util.*;

public class Main{
  public static void main(String[] args) {
    
    String theOne = "pika";

    final BooleanSupplier itsHere = () -> {
    List <String> areHere = Arrays.asList("1","2","pika");
        for (String eachOne : areHere) {
            if(eachOne.equals(theOne)) { return Boolean.TRUE; }
        } return Boolean.FALSE;
    };
    
    Boolean result = itsHere.getAsBoolean(); //this code execute supplier and get result.
    System.out.println(result);
    
  }
}