Java中 for循环 遍历的五种方式

java中的for循环其实有很多种表现形式，下面总结一下

package Strings;

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

public class Lists {
    public static void main(String[] args) {

        List<Integer> list = new ArrayList<Integer>();
        Integer n = 10;
        for(int i = 0;i < n;i++) {
            list.add(i);
        }
        //方法一：常规遍历
        System.out.print("方法一>>输出list:");
        for(int j = 0; j <list.size();j++) {
            System.out.print(list.get(j)+" ");
        }

        //方法二：iterator 迭代遍历
        System.out.println("");
        System.out.print("方法二>>输出list:");
        for (Iterator iterator = list.iterator(); iterator.hasNext(); ) {
            System.out.print(iterator.next()+" ");
        }

        //方法三：增强for循环
        System.out.println("");
        System.out.print("方法三>>输出list:");
        for (int i : list) {
            System.out.print(list.get(i)+" ");

        }

        //方法四：forEach
        System.out.println("");
        System.out.print("方法四>>输出list:");
        list.forEach(
            item -> {
                System.out.print(item+" ");
        });

        //方法五:stream().forEach
        System.out.println("");
        System.out.print("方法五>>输出list:");
        list.stream().forEach(
            item -> {
                System.out.print(item+" ");
        });
    }

}