import java.util.*;
var map = new HashMap<Integer, String>() {{
put(1, "A");
put(2, "B");
}};
var value1 = map.get(3);
//value1 is null
var value2 = map.getOrDefault(3, "-");
//value2 is "-"
System.out.println("value1 is '" + value1 + "'");
System.out.println("value2 is '" + value2 + "'");