如何从数组中删除对象 [英] How to remove object from array

问题描述

请耐心等待，因为这可能很难理解

Please bear within as it might be difficult to understand

我有一个大小为50的jbutton数组，在本例中，我滥用7我在1 2 3 4 6 7内拥有jbutton对象，但在5之内.这些都打印在屏幕上.我想删除这些jbutton，但是最多删除5个所有按钮，而最后两个没有删除.

I have an array of jbuttons 50 size big, for this example ill use 7 I have jbutton object within 1 2 3 4 6 7 but not 5. These are printed on the screen. I want to remove these jbuttons however all buttons up to 5 are removed while the last two are not.

        for(int i = 1; i < 51; i++){ 
            if(seat.buttonArray[i] == null){
            remove(seat.buttonArray[i]);
            seat.buttonArray[i] = null;}
        }

推荐答案

无法从array中删除元素，假设您希望在删除后更改后一个索引.为此，您应该使用List:

There is no way to remove element from array, assuming you want latter indexes changed after remove. For this purpose, you should use List:

Iterator buttonIterator = seat.buttonList.iterator();
while (buttonIterator.hasNext()) {
    Object button = buttonIterator.next(); //or more specific type, if your list was generified
    if (button == null) { //or some other criteria, wrote this just as an example
        buttonIterator.remove();
    }
}

如果必须使用array，则有两个选择:

If using array is mandatory, you have two options:

• 将seat.buttonArray[i]设置为null值，表示已将其删除；
• 每次删除某些内容时都重新创建数组.请参见

• Set seat.buttonArray[i] to null value, indicating it has been removed;
• Recreate array each time you deleted something. See System.arraycopy javadoc for details, although I do not recommend this approach because of performance considerations.

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