實現一個自定義的ArrayList類,實現將原List中的每一個數據都乘以10

1.首先自定義一個Operate接口,以下所示:java

public interface Operate {
    public Integer caozuo(Integer i);
}
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2.實現自定義的ArrayList類,即自定義MyArrayList類,以下:ide

import java.util.ArrayList;

public class MyArrayList {
    private ArrayList<Integer> list;
    private ArrayList<Integer> resultList;

    public MyArrayList(ArrayList<Integer> list) {
        this.list = list;
    }

    public ArrayList<Integer> map(Operate op){
        resultList = new ArrayList<Integer>();
        for(Integer i : list){
         resultList.add(op.caozuo(i));
        }
        return resultList;
    }

}
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3.按正說還須要寫一個實現Operate接口的類,可是咱們這裏可使用匿名接口實現類,因此測試代碼以下:測試

import java.util.ArrayList;

public class Test01 {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<Integer>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(5);

        MyArrayList myList = new MyArrayList(list);

        ArrayList<Integer> map = myList.map(new Operate() {
            @Override
            public Integer caozuo(Integer i) {
                return i * 10;
            }
        });


        System.out.println(map);

    }
}
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