java 我想将布尔数组中的所有值设置为 false 而不重新初始化它
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I'd like to set all the values in a boolean array to false without re-initializing it
提问by EnkeiRC5
public boolean used[] = new boolean[26];
Here is what I have, and it's working great. I know they are all going to be set as false by default. But, as my application is used for a while, some of those are changed to "true". (Which is fine, since that's what my code is supposed to do).
这是我所拥有的，而且效果很好。我知道默认情况下它们都将被设置为 false。但是，由于我的应用程序使用了一段时间，其中一些更改为“true”。（这很好，因为这是我的代码应该做的）。
I'm trying to create a "reset" button, which will simulate a reset-like action. Where all variables are restored to what they were when the window was initially created (all drawings go away - just a fresh restart).
我正在尝试创建一个“重置”按钮，它将模拟类似重置的操作。所有变量都恢复到最初创建窗口时的状态（所有图形都消失了 - 只是重新启动）。
And I need all of those true booleans to go back to false in one fell swoop. Any ideas?
我需要所有这些真正的布尔值一举回到 false。有任何想法吗？
回答by Chris Pitman
回答by EnkeiRC5
Arrays.filluses a rangecheckbefore filling your array.
Arrays.fill在填充数组之前使用范围检查。
public static void fill(Object[] a, int fromIndex, int toIndex, Object val) {
rangeCheck(a.length, fromIndex, toIndex);
for (int i=fromIndex; i<toIndex; i++)
a[i] = val;
}
/**
* Check that fromIndex and toIndex are in range, and throw an
* appropriate exception if they aren't.
*/
private static void rangeCheck(int arrayLen, int fromIndex, int toIndex) {
if (fromIndex > toIndex)
throw new IllegalArgumentException("fromIndex(" + fromIndex +
") > toIndex(" + toIndex+")");
if (fromIndex < 0)
throw new ArrayIndexOutOfBoundsException(fromIndex);
if (toIndex > arrayLen)
throw new ArrayIndexOutOfBoundsException(toIndex);
}
if you don't need rangeCheck, you can just use a forloopto fill up your boolean array.
如果您不需要 rangeCheck，您可以使用forloop来填充您的布尔数组。
for(int i = 0; i < used.length; ++i){
used[i] = false;
}
回答by miks
You can just recreate your array, it will be initialized by default to false.
您可以重新创建数组，默认情况下它会被初始化为 false。
That is when you implement the reset yo can do
那就是当你实施重置你可以做的
used[] = new boolean[26];
回答by Ernest Friedman-Hill
Use java.util.Arrays.fill():
使用java.util.Arrays.fill()：
Arrays.fill(used, false);
