[英]How can I check if the char array has an empty cell so I can print 0 in it?
Code: 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';
}
}
}
Change it to: if(position[i][j] == 0)
将其更改为:
if(position[i][j] == 0)
Each char can be compared with an int. 每个char都可以与int进行比较。
The default value is '\ '
ie 0
for a char array element. 默认值为
'\ '
即char数组元素为0
。
And that's exactly what you meant by empty cell
, I assume. 而这正是你所说的
empty cell
意思。
To test this you can run this. 要测试这个,你可以运行它。
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.");
}
}
}
}
}
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 char
element is '\ '
(the null character ) which is also equal to 0
. 每个
char
元素的默认值是'\ '
( 空字符 ),它也等于0
。 So you can check this instead: 所以你可以检查一下:
if (postision[i][j] == '\u0000')
or use this if you want to improve readability: 如果您想提高可读性,请使用此选项:
if (positionv[i][j] == 0)
if(position[i][j]==0)
{
// The index value of [i][j] is 0
}
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