数组长度不同时，除循环外是否有更优的双数组并排打印方法？

Great question! The approach you mentioned works, but we can make the code cleaner, more maintainable, and avoid splitting the logic into multiple loops. Here are a couple of more elegant solutions:

1. Use a Helper Method with a Single Loop #

This approach reduces code duplication by extracting the "get element or default" logic into a reusable method, then iterating over the maximum length of the two arrays once:

public class ArrayPairPrinter {
    // Helper method to safely get an element or return "--" if index is out of bounds
    private static String getElementOrDefault(String[] array, int index) {
        return index < array.length ? array[index] : "--";
    }

    public static void main(String[] args) {
        String[] names = {"Sam", "Ben", "Nancy"};
        String[] ages = {"5", "10"};
        
        int maxLength = Math.max(names.length, ages.length);
        
        // Single loop handles all elements, no need for separate logic for remaining items
        for (int i = 0; i < maxLength; i++) {
            System.out.printf("%s %s%n", getElementOrDefault(names, i), getElementOrDefault(ages, i));
        }
    }
}

2. Functional Approach with Java Streams (Java 8+) #

If you prefer a more concise, declarative style, you can use IntStream to iterate over the indices:

import java.util.stream.IntStream;

public class ArrayPairPrinter {
    private static String getElementOrDefault(String[] array, int index) {
        return index < array.length ? array[index] : "--";
    }

    public static void main(String[] args) {
        String[] names = {"Sam", "Ben", "Nancy"};
        String[] ages = {"5", "10"};
        
        int maxLength = Math.max(names.length, ages.length);
        
        IntStream.range(0, maxLength)
                 .forEach(i -> System.out.printf("%s %s%n",
                     getElementOrDefault(names, i),
                     getElementOrDefault(ages, i)));
    }
}

Why These Are Better #

• Single loop/stream: No need to split the logic into two separate parts (handling the shorter array, then the remaining elements), which reduces code duplication and potential bugs.
• Reusable helper method: If you need to handle more arrays later, you can easily reuse the getElementOrDefault method instead of rewriting the ternary condition every time.
• Readability: The intent of the code is clearer at a glance—we're pairing elements from both arrays, using "--" as a fallback when one array runs out of elements.

内容的提问来源于stack exchange，提问作者riorio