Question

我试图将二维String数组复制到另一个二维String数组。然后将第二个2维String数组转换为字符串。之后打印出字符串但字符串没有显示假设... 我试图在不使用java库的情况下这样做。

 public class Train {
//public static void main (String args){
public static void main(String[] args) {
String [][] ff = { {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"},

                   {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"},
                   {"0","1","2","3","4","5","6","7"} };


    String[][] IP = new String[8][8];
    int x=0, y=0;
        for(int i = 1; i < 8; i +=2){

            for(int j = 7; j>=0 ; j--){
                y= 0;
            IP[x][y]=ff[j][i];
            System.out.print(IP[x][y]);
                    y++;               
            }
        if (i==7){
            i=-2;
            x++;
          }

        }
                String zz= "";
    for( int p = 0; p<8;p++){
        for( int q= 0 ; q< 8; q++){
        zz += IP[p][q];
       System.out.print(zz);
        }   
    }
    }

}

谢谢

Answer 1

使用此：String yourString = Arrays.toString(yourArray);

Answer 2

System.out.print(IP);

在Java中，每个对象都有toString()方法，默认显示类名表示，然后添加@，然后添加哈希码。

您应该使用Arrays#deepToString：

System.out.println(Arrays.deepToString(yourArray));

Answer 3

该行

System.out.print(IP);

只是打印出Object表示。当您创建zz字符串时，您几乎就在那里。尝试在迭代后打印出来。

由于您不想使用任何Java库，因此需要再次遍历该数组。当然，如果您假设java.util.*是一个库。

Answer 4

如果您不想使用该库：

String ffStr = "";
for (String[] sArray : ff) {
    for (String s : sArray) {
        ffStr += s;
    }
}
System.out.println(ffStr);

Java将2维String数组转换为String

4 个答案: