JavaApp.java

// JavaApp.java

private boolean isEven(int id) {
   return id % 2 == 0;
}

public boolean invokeJavaSam(int id, JavaSam sam) {
   return sam.apply(id);
}

private void useJavaSam() {
   JavaSam javaSam = id -> id % 2 == 0;
   invokeJavaSam(3, id -> id % 2 == 0);
   invokeJavaSam(4, this::isEven);
}