java 如何在java中初始化一个二维字符串数组
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How to initialize a 2D array of strings in java
提问by Senpai
I know how to declare the array and I have done so:
我知道如何声明数组，我已经这样做了：
String[][] board1 = new String[10][10];
Now I want to make it so that every space is "-" by default (without the quotes of course). I have seen other questions like this but the answers didn't make sense to me. All I can understand is that I would probably need a for loop.
现在我想让它默认每个空格都是“-”（当然没有引号）。我见过其他类似的问题，但答案对我来说没有意义。我所能理解的是，我可能需要一个 for 循环。
回答by Elliott Frisch
The quickest way I can think of is to use Arrays.fill(Object[], Object)like so,
我能想到的最快方法是这样使用Arrays.fill(Object[], Object)，
String[][] board1 = new String[10][10];
for (String[] row : board1) {
Arrays.fill(row, "-");
}
System.out.println(Arrays.deepToString(board1));
This is using a For-Eachto iterate the String[](s) of board1and fill them with a "-". It then uses Arrays.deepToString(Object[])to print it.
这是使用 aFor-Each来迭代String[](s)board1并用“-”填充它们。然后它Arrays.deepToString(Object[])用于打印它。
回答by MadProgrammer
You could do ...
你可以做...
String[][] board1 = new String[][] {
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
{"-", "-", "-", "-", "-", "-", "-", "-", "-", "-"},
};
or
或者
String[][] board1 = new String[10][10];
for (int outter = 0; outter < board1.length; outter++) {
String[] row = new String[board1[outter].length];
for (int inner = 0; inner < row.length; inner++) {
row[inner] = "-";
}
board1[outter] = row;
}
or
或者
String[][] board1 = new String[10][10];
for (int outter = 0; outter < board1.length; outter++) {
for (int inner = 0; inner < board1[outter].length; inner++) {
board1[outter][inner] = "-";
}
}
