你如何在Java中追加合并两个二维数组正常吗? [英] How do you append two 2D array in java properly?

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问题描述

我一直试图在java中后置两个2 D阵列。是否有可能得到一个例子,因为我一直在试图寻找它,但不能找到一个。

  INT [] [] appendArray(空,窗)
{
    INT [] []结果=新的INT [empty.length] [空[0] +。长度窗口[0]。长度]
}


解决方案

在这里你去:

 进口java.util.Arrays中;
公共类Array2DAppend {    公共静态无效的主要(字串[] args){        INT [] []一个=新INT [] [] {{1,2},{3,4}};
        INT [] [] B =新INT [] [] {{1,2,3},{3,4,5}};        的System.out.println(Arrays.deepToString(一));
        的System.out.println(Arrays.deepToString(B));
        的System.out.println(Arrays.deepToString(追加(A,B)));    }    公共静态INT [] []追加(INT [] []一,INT [] [] B){
        INT [] []结果=新的INT [则为a.length + b.length个] [];
        System.arraycopy(一,0,结果,0,则为a.length);
        System.arraycopy(B,0,结果,则为a.length,b.length个);
        返回结果;
    }
}

和输出:

  [1,2],[3,4]
[[1,2,3],[3,4,5]
[[1,2],[3,4],[1,2,3],[3,4,5]

I have been trying to append two 2 D arrays in java. Is it possible to get an example because I have been trying to look it up but cannot find one.

int [][]appendArray(empty,window)
{
    int [][]result= new int [empty.length][empty[0].length+window[0].length];       
}

解决方案

Here you go:

import java.util.Arrays;


public class Array2DAppend {

    public static void main(String[] args) {

        int[][] a = new int[][] {{1, 2}, {3, 4}};
        int[][] b = new int[][] {{1, 2, 3}, {3, 4, 5}};

        System.out.println(Arrays.deepToString(a));
        System.out.println(Arrays.deepToString(b));
        System.out.println(Arrays.deepToString(append(a, b)));

    }

    public static int[][] append(int[][] a, int[][] b) {
        int[][] result = new int[a.length + b.length][];
        System.arraycopy(a, 0, result, 0, a.length);
        System.arraycopy(b, 0, result, a.length, b.length);
        return result;
    }
}

and the output:

[[1, 2], [3, 4]]
[[1, 2, 3], [3, 4, 5]]
[[1, 2], [3, 4], [1, 2, 3], [3, 4, 5]]

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