Java implements copying list

Background:

At first I wanted to copy a collection when entering a new page and save it for subsequent operations, so I just wrote List A=List B, later I found that when operating B, the data in A will also change accordingly.

(Video tutorial recommendation: java course)

It was found through query that directly using "=" is equivalent to an array with the same content in java pointing to the same address, that is After shallow copying, A and B point to the same address. The consequence is that changing B will also change A, because changing B means changing the content of the address pointed to by B. Since A also points to the same address, A and B are changed together. To copy an independent array, you can use the following method:

public class GoodsBean extends HttpResult implements Cloneable{
@Override
protected Object clone() throws CloneNotSupportedException {
    GoodsBean o = null;
    try {
        o = (GoodsBean) super.clone();
    } catch (CloneNotSupportedException e) {
        e.printStackTrace();
    }
    return o;
}
public  ArrayList<GoodsBean> deep_clone(ArrayList<GoodsBean> cells, ArrayList<GoodsBean> clone_cells){
    for(GoodsBean c : cells){
        try {
            clone_cells.add((GoodsBean) c.clone());
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
    }
    return clone_cells;
}
}

Related recommendations: java introductory tutorial

The above is the detailed content of Java implements copying list. For more information, please follow other related articles on the PHP Chinese website!