Java Coding Problems

43. Checking null references and returning non-null default references

A solution to this problem can easily be provided via if-else (or the ternary operator), as in the following example (as a variation, name, and color can be declared as non-final and initialized with the default values at declaration):

public class Car {  private final String name;  private final Color color;  public Car(String name, Color color) {    if (name == null) {      this.name = "No name";    } else {      this.name = name;    }    if (color == null) {      this.color = new Color(0, 0, 0);    } else {      this.color = color;    }  }}

However, starting with JDK 9, the preceding code can be simplified via two methods from the Objects class. These methods are requireNonNullElse() and requireNonNullElseGet() ...