将二维数组转换为另一个二维数组Java
我还有另一个Java问题:)
我已经阅读了这个线程，它在那里解释清楚，但我有两个我想复制的二维数组。
我明白这段代码
int[] array1and2 = new int[array1.length + array2.length];
System.arraycopy(array1, 0, array1and2, 0, array1.length);
System.arraycopy(array2, 0, array1and2, array1.length, array2.length);
但我的问题是，我如何将它与两个数组合并在一起
int a1[][] = new int [3][3];
int b1[][] = new int [3][3];
int c1[][] = new int [3][6];
哪里c1是上述数组的合并？
使用您在问题中提到的解决方案。 例：
import java.util.Arrays;
public class ArrayProgram {
public static void main(String[] args) {
int[][] array1 = { { 1, 2, 3 }, { 1, 2, 3 }, { 1, 2, 3 } };
int[][] array2 = { { 4, 5, 6 }, { 7, 8, 9 }, { 0, 1, 2 } };
int[][] result = ArrayCopier.joinSecondDimension(array1, array2);
for (int[] array : result) {
System.out.println(Arrays.toString(array));
}
}
}
class ArrayCopier {
public static int[][] joinSecondDimension(int[][] array1, int[][] array2) {
int[][] array1and2 = new int[array1.length][];
for (int index = 0; index < array1.length; index++) {
array1and2[index] = join(array1[index], array2[index]);
}
return array1and2;
}
public static int[] join(int[] array1, int[] array2) {
int[] array1and2 = new int[array1.length + array2.length];
System.arraycopy(array1, 0, array1and2, 0, array1.length);
System.arraycopy(array2, 0, array1and2, array1.length, array2.length);
return array1and2;
}
}
打印：
[1, 2, 3, 4, 5, 6]
[1, 2, 3, 7, 8, 9]
[1, 2, 3, 0, 1, 2]
编辑
任何参数编号（可变长度参数列表）的实现：
import java.util.Arrays;
public class ArrayProgram {
public static void main(String[] args) {
int[][] array1 = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
int[][] array2 = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
int[][] array3 = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
test(array1);
test(array1, array2);
test(array1, array2, array3);
}
private static void test(int[][]... arrays) {
int[][] result = ArrayCopier.joinSecondDimension(arrays);
for (int[] array : result) {
System.out.println(Arrays.toString(array));
}
System.out.println();
}
}
class ArrayCopier {
public static int[][] joinSecondDimension(int[][]... arrays) {
int firstArrayLength = arrays[0].length;
int[][] result = new int[firstArrayLength][];
for (int index = 0; index < firstArrayLength; index++) {
result[index] = join(getSecondDimArrays(index, arrays));
}
return result;
}
public static int[] join(int[]... arrays) {
int[] result = new int[getTotalLength(arrays)];
int destPos = 0;
for (int[] array : arrays) {
System.arraycopy(array, 0, result, destPos, array.length);
destPos += array.length;
}
return result;
}
private static int getTotalLength(int[]... arrays) {
int length = 0;
for (int[] array : arrays) {
length += array.length;
}
return length;
}
private static int[][] getSecondDimArrays(int index, int[][]... arrays) {
int[][] result = new int[arrays.length][];
int resultIndex = 0;
for (int[][] array : arrays) {
result[resultIndex++] = array[index];
}
return result;
}
}
打印：
[1, 2, 3]
[4, 5, 6]
[7, 8, 9]
[1, 2, 3, 1, 2, 3]
[4, 5, 6, 4, 5, 6]
[7, 8, 9, 7, 8, 9]
[1, 2, 3, 1, 2, 3, 1, 2, 3]
[4, 5, 6, 4, 5, 6, 4, 5, 6]
[7, 8, 9, 7, 8, 9, 7, 8, 9]
像这样的东西应该工作得很好？
int a1[][] = new int [3][3];
int b1[][] = new int [3][3];
int c1[][] = new int [3][6];
for (int i = 0; i < a1.length; i++) {
System.arraycopy(a1[i], 0, c1[i], 0, a1[i].length);
System.arraycopy(a2[i], 0, c1[i], a1[i].length, a2[i].length);
}
顺便说一句，我从你的维度假设c看起来像：
[ a, a, a, , , ]
[ a, a, a, , b, ]
[ a, a, a, , , ]