如何将两个Double合并在一起？

public class DoubleMergeExample {
    public static void main(String[] args) {
        Double num1 = 1.5;
        Double num2 = 2.3;
        
        Double result = num1 + num2;
        System.out.println("合并后的结果是: " + result);
    }
}

public class DoubleMergeExample {
    public static void main(String[] args) {
        Double num1 = 1.5;
        Double num2 = 2.3;
        
        Double average = (num1 + num2) / 2;
        System.out.println("平均值是: " + average);
    }
}

public class DoubleMergeExample {
    public static void main(String[] args) {
        Double num1 = 1.5;
        Double num2 = null;
        
        Double result = (num1 != null && num2 != null) ? num1 + num2 : null;
        if (result != null) {
            System.out.println("合并后的结果是: " + result);
        } else {
            System.out.println("无法合并，存在空值");
        }
    }
}