Java中如何合并两个数组？

它不是连接而是合并两个数组，使它们成为名称值对的数组。

firstarray = ["a","aa","aaa"]
secondarray = ["b","bb","bbb"]
result = [["a","b"],["aa","bb"],["aaa","bbb"]]

最好的方法是什么？

in Java:

public static int [][] concat(int a[], int b[]) {
    int res[][] = new int[a.length][2];
    if (a.length != b.length) {
        throw new IllegalArgumentException("lenght are not equal, cannot perform");
    }
    for (int i = 0; i < a.length; i++) {
        res[i][0] = a[i];
        res[i][1] = b[i];
    }
    return res;
}