数组列表替换元素是否存在于给定的索引中？

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If you're going to be requiring different set functionaltiy, I'd advise extending ArrayList with your own class. This way, you won't have to define your behavior in more than one place.

// You can come up with a more appropriate name
public class SizeGenerousArrayList<E> extends java.util.ArrayList<E> {


@Override
public E set(int index, E element) {
this.ensureCapacity(index+1); // make sure we have room to set at index
return super.set(index,element); // now go as normal
}


// all other methods aren't defined, so they use ArrayList's version by default


}

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An element is over-written if it already exists at an index, that is the default behaviour: Javadoc.

Or am I missing your point completely?

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最佳答案

  arrayList.set(index i,String replaceElement);

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Just add a break after your remove() statement

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just use this method inside arraylist

list.set(/*index*/,/*value*/)