数组去重

方法一

 public static void main(String[] args) {
        String[] array = {"a","b","c","c","d","e","e","e","a"};
        List<String> list = new ArrayList<>();
        for (int i=0;i<array.length;i++) {
            if(list.indexOf(array[i]) == -1){
                list.add(array[i]);
            }
        }
        String[] arrayResult =  list.toArray(new String[list.size()]);
        System.out.println(Arrays.toString(arrayResult));
    }

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方法二

 public static void main(String[] args) {
        String[] array = {"a","b","c","c","d","e","e","e","a"};
        Arrays.sort(array);
        List<String> list = new ArrayList<>();
        list.add(array[0]);
        for(int i=1;i<array.length;i++){
            if(!array[i].equals(list.get(list.size()-1))){
                list.add(array[i]);
            }
        }
        String[] arrayResult = list.toArray(new String[list.size()]);
        System.out.println(Arrays.toString(arrayResult));
    }

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方法三

public static void main(String[] args) {
        String[] array = {"a","b","c","c","d","e","e","e","a"};
        Set<String> set = new HashSet<>();
        for (int i=0;i<array.length;i++) {
            set.add(array[i]);
        }
        String[] arrayResult =  set.toArray(new String[set.size()]);
        System.out.println(Arrays.toString(arrayResult));
    }