java怎么删除数组中一列数据

int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
int[][] newArr = new int[arr.length - 1][];

// 复制数组的每一行，跳过要删除的列
for (int i = 0; i < arr.length; i++) {
    newArr[i] = new int[arr[i].length - 1];
    System.arraycopy(arr[i], 0, newArr[i], 0, arr[i].length - 1);
}

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;

int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
Builder<ImmutableList<ImmutableList<Integer>>> builder = ImmutableList.builder();

// 遍历每一行并过滤掉要删除的列
for (ImmutableList<Integer> row : ImmutableList.copyOf(arr)) {
    builder.add(ImmutableList.copyOf(row.subList(0, row.size() - 1)));
}

ImmutableList<ImmutableList<Integer>> newArr = builder.build();

import org.apache.commons.lang3.ArrayUtils;

int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
int[][] newArr = ArrayUtils.removeColumns(arr, 1);

int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
int[][] newArr = new int[arr.length][arr[0].length - 1];

// 遍历每一行并创建新数组
for (int i = 0; i < arr.length; i++) {
    for (int j = 0; j < newArr[i].length; j++) {
        if (j < arr[i].length - 1) {
            newArr[i][j] = arr[i][j];
        }
    }
}