在 Java 中像表格一样打印二维数组
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Printing a 2d array in Java like a table
提问by Adam Calcanes
I'd like to print an inputed 2-dimensional array like a table i.e if for some reason they put in all 1s...
我想像表格一样打印一个输入的二维数组，即如果由于某种原因他们把所有的 1...
1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1
Just like so above but in the console on Java eclipse, no fancy buttons and GUI's but in the console, here is what I have....
就像上面一样，但是在 Java eclipse 的控制台中，没有花哨的按钮和 GUI，但是在控制台中，这就是我所拥有的....
import java.util.Scanner;
public class Client {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int[][] table = new int[4][4];
for (int i=0; i < table.length; i++) {
for (int j=0; j < table.length; j++) {
System.out.println("Enter a number.");
int x = input.nextInt();
table[i][j] = x;
System.out.print(table[i][j] + " ");
}
System.out.println();
}
System.out.println(table);
}
}
And this is what I get when I input everything and the console terminates:
这就是我输入所有内容并且控制台终止时得到的结果：
Enter a number.
1
1 Enter a number.
1
1 Enter a number.
1
1 Enter a number.
1
1
[[I@3fa1732d
采纳答案by tonga
You need to print out the array separately from entering the number. So you can do something like this:
您需要将数组与输入数字分开打印。所以你可以做这样的事情：
public class PrintArray {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int[][] table = new int[4][4];
for (int i = 0; i < table.length; i++) {
for (int j = 0; j < table.length; j++) {
// System.out.println("Enter a number.");
int x = input.nextInt();
table[i][j] = x;
}
//System.out.println();
}
// System.out.println(table);
for (int i = 0; i < table.length; i++) {
for (int j = 0; j < table[i].length; j++) {
System.out.print(table[i][j] + " ");
}
System.out.println();
}
}
}
回答by Obicere
Consider using java.util.Arrays.
考虑使用java.util.Arrays.
There is a method in there called deepToString. This will work great here.
里面有一个方法叫做deepToString. 这将在这里工作得很好。
System.out.println(Arrays.deepToString(table));
Relevant here: Simplest way to print an array in Java
此处相关：用 Java 打印数组的最简单方法
回答by evanchooly
You'll have loop back through those arrays to print out the contents. an array's toString() just prints the reference value.
您将循环遍历这些数组以打印出内容。数组的 toString() 只是打印参考值。
回答by Louis B
System.out.print(table) calls a method in array class that prints out the identifier of the vairable. you need to either create a for loop that will print out each element like System.out.print(table[i][j]) or use the Arrays class and say Arrays.toString(table);
System.out.print(table) 调用数组类中的方法，打印出变量的标识符。您需要创建一个 for 循环来打印每个元素，如 System.out.print(table[i][j]) 或使用 Arrays 类并说 Arrays.toString(table);
回答by 111
Try copying this simple for loop to printing a 4x4 table:
尝试复制这个简单的 for 循环来打印 4x4 表：
Scanner input = new Scanner();
int numArray [] [] = new int [4] [4];
for ( int c = 0; c < 4; c++ ) {
for (int d = 0; d < 4; d++) {
System.out.print("Enter number : ");
nunArray [c][d] = input.nextInt();
}
}
for (int a = 1; a<5;a++) {
for (int b = 1; b <5;b++) {
System.out.print(numArray [a][b]+" ");
}
System.out.println();
}
