比如我有三個int類型的數組,分别是
int[] a = { 1, 2, 3 };
int[] b = { 4, 5 };
int[] c = { 6, 8 };
想合并為一個大的數組,怎麼辦呢?

public static int[] mergearray(int[]... a) {
// 合并完之後數組的總長度
int index = 0;
int sum = 0;
for (int i = 0; i < a.length; i++) {
sum = sum + a[i].length;
}
int[] result = new int[sum];
int lengthone = a[i].length;
//拷貝數組
system.arraycopy(a[i], 0, result, index, lengthone);
index = index + lengthone;
return result;
}
//測試方法,把a、b、c三個數組合并為result(同類型的數組,長度為三個數組長度總和)
@test
public void testmerge() {
int[] a = { 1, 2, 3 };
int[] b = { 4, 5 };
int[] c = { 6, 8 };
int[] result = mergearray(a, b, c);
for (int i = 0; i < result.length; i++) {
system.out.print(result[i] + " ");
system.out.println();
system.out.println("length:"+result.length);