[英]Java 2Dimensional Boolean Array Values
I'm having a problem with my 2 dimensional boolean array. 我的二维布尔数组有问题。 (or it may be with the logic of printing out the values).
(或者可能是打印出值的逻辑)。 I set all of the values in the array to false in the beginning, and then later i print out the values to the screen.
首先,我将数组中的所有值都设置为false,然后将其打印到屏幕上。 When i print them out, they all come up as true.
当我将它们打印出来时,它们都是真实的。
x=20;
y=10;
boolArray = new boolean[x][y];
for(int c=0;c<x;c++)
{
for(int i=0;i<y;i++)
{
boolArray[c][i] = false;
}
}
System.out.println("2D Boolean Array:");
for(int a = 0; a < boolArray.length; a++)
{
for(int b = 0; b < boolArray[a].length; b++)
{
if(boolArray[a][b] = true)
{
System.out.print("T");
}
else if(boolArray[a][b] = false)
{
System.out.print("F");
}
}
}
This is bad: 这不好:
if(boolArray[a][b] = true)
{
System.out.print("T");
}
else if(boolArray[a][b] = false)
{
System.out.print("F");
}
you are using the assignment operator =
instead of the comparison operator ==
您正在使用赋值运算符
=
而不是比较运算符==
You could change it to 您可以将其更改为
if(boolArray[a][b] == true)
//...
else if(boolArray[a][b] == false)
or nicer 或更好
if(boolArray[a][b])
//...
else if(!boolArray[a][b])
or even nicer: 甚至更好:
if(boolArray[a][b])
//...
else
Try this: 尝试这个:
if(boolArray[a][b])
{
System.out.print("T");
}
else
{
System.out.print("F");
}
With booleans you can do like 使用布尔值,您可以喜欢
if(boolean field)
You have used =
assigment instead of ==
comparison. 您已使用
=
分配而不是==
比较。
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