我还有一个
Java问题:)
我已经阅读了this线程,它清楚地解释了它,但我有两个我想要复制的二维数组.
我明白这段代码
int[] array1and2 = new int[array1.length + array2.length]; System.arraycopy(array1,array1and2,array1.length); System.arraycopy(array2,array1.length,array2.length);
但我的问题是,如何将其与两个数组合并在哪里
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？
解决方法
使用您在问题中提到的
task解决方案.例：
import java.util.Arrays;
public class ArrayProgram {
public static void main(String[] args) {
int[][] array1 = { { 1,2,3 },{ 1,3 } };
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,array1.length);
System.arraycopy(array2,array2.length);
return array1and2;
}
}
打印：
[1,3,4,6] [1,7,9] [1,2]
编辑
任何参数号的实现(Variable-Length Argument Lists)：
import java.util.Arrays;
public class ArrayProgram {
public static void main(String[] args) {
int[][] array1 = { { 1,{ 4,9 } };
int[][] array2 = { { 1,9 } };
int[][] array3 = { { 1,9 } };
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,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：
[1,3] [4,6] [7,9] [1,6,9,9]