Java遍历集合四种方法

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import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class Test {

    public static void main(String[] args) {

        List list = new ArrayList();

        list.add(3);
        list.add(2);
        list.add(10);
        list.add(4);
        list.add(70);
        /*   System.out.println("---方法一 -----");
            for(Iterator iterator = list.iterator();iterator.hasNext();){
                int i = (Integer) iterator.next();
                System.out.println(i);
            }

        /* System.out.println("---方法二 -----");
        Iterator iterator = list.iterator();
        while(iterator.hasNext()){

            int i = (Integer) iterator.next();
            System.out.println(i);

        }
         System.out.println("---方法三 -----");
        for (Object object : list) {

            System.out.println(object);

        }*/
        System.out.println("---方法四 -----");
        for (int i = 0 ;i<list.size();i++) {

            int j= (Integer) list.get(i);
            System.out.println(j);

        }

    }

}