java如何把两个二维数组合并成一个，高效的方法，希望大家给点意见

如题目

以String为例的一个示例。

import java.util.*;

public class Test {
public static void main(String[] args) {
String[][] strs1 = {{"start", "htr", "fa"},
{"543", "gfd", "gs"},
{"jh", "k", "gsk"},
{"675", "hfhgf"}};
String[][] strs2 = {{"fdsa", "432", "fds"},
{"j","hgf34"},
{"765", "gfj", "456", "jkl"},
{"lkjhl", "gfds", "hgfh", "end"}};
String[][] strs3 = unite(strs1, strs2);
for(String[] list : strs3) {
for(String s : list) {
System.out.print(s + " ");
}
System.out.println();
}
}

public static String[][] unite(String[][] os1, String[][] os2) {
List<String[]> list = new ArrayList<String[]>(Arrays.<String[]>asList(os1));
list.addAll(Arrays.<String[]>asList(os2));
return list.toArray(os1);
}
}

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