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What is the Simplest Way to Reverse an ArrayList?

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伪装坚强ぢ
伪装坚强ぢ 2020-11-28 18:10

What is the simplest way to reverse this ArrayList?

ArrayList aList = new ArrayList<>();

//Add elements to ArrayList object
aList.add(\
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  • 渐次进展
    渐次进展 (楼主)
    2020-11-28 18:34

    Not the simplest way but if you're a fan of recursion you might be interested in the following method to reverse an ArrayList:

    public ArrayList reverse(ArrayList list) {
    if(list.size() > 1) {                   
        Object value = list.remove(0);
        reverse(list);
        list.add(value);
    }
    return list;
}



    Or non-recursively:
    


    public ArrayList reverse(ArrayList list) {
    for(int i = 0, j = list.size() - 1; i < j; i++) {
        list.add(i, list.remove(j));
    }
    return list;
}

    
    
             
    
                                                        
    
            
            
    
              
                
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