Java 如何检查字符数组是否有一个空单元格，以便我可以在其中打印 0？
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How can I check if the char array has an empty cell so I can print 0 in it?
提问by steven1816
Code:
代码：
public void placeO(int xpos, int ypos) {
for(int i=0; i<3;i++)
for(int j = 0;j<3;j++) {
// The line below does not work. what can I use to replace this?
if(position[i][j]==' ') {
position[i][j]='0';
}
}
}
采纳答案by peter.petrov
Change it to: if(position[i][j] == 0)
Each char can be compared with an int.
The default value is '\u0000'i.e. 0for a char array element.
And that's exactly what you meant by empty cell, I assume.
将其更改为：if(position[i][j] == 0)
每个字符都可以与一个整数进行比较。
默认值是'\u0000'ie0用于 char 数组元素。
这正是你的意思empty cell，我想。
To test this you can run this.
要对此进行测试，您可以运行它。
class Test {
public static void main(String[] args) {
char[][] x = new char[3][3];
for (int i=0; i<3; i++){
for (int j=0; j<3; j++){
if (x[i][j] == 0){
System.out.println("This char is zero.");
}
}
}
}
}
回答by Kick
if(position[i][j]==0)
{
// The index value of [i][j] is 0
}
回答by Christian
Assuming you have initialized your array like
假设你已经初始化了你的数组
char[] position = new char[length];
the default value for each charelement is '\u0000'(the null character) which is also equal to 0. So you can check this instead:
每个char元素的默认值是'\u0000'（空字符），它也等于0。所以你可以检查这个：
if (postision[i][j] == '\u0000')
or use this if you want to improve readability:
或者如果您想提高可读性，请使用它：
if (positionv[i][j] == 0)
