Java Array学习

package com.hylink.testList;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class testArrayList {
	public static void main(String[] args) {
		Collection<String> arrList = new ArrayList<String>();
		arrList.add("代");
		arrList.add("eclipse");
		
		List<String> arrList2 = new ArrayList<String>();
		arrList2.add("周瑜");
		arrList2.add("诸葛亮");
		arrList2.add(0, "刘备");
		arrList2.addAll(0, arrList);
		System.out.println(arrList2);
		
//		arrList2.remove("eclipse");
		arrList2.remove(2);
		arrList2.retainAll(arrList);//retain保持；雇；记住  保留arrList,即只包含元素arrList了
//		arrList2.removeAll(arrList);
		System.out.println(arrList2);
		
		String[] strArr = arrList2.toArray(new String[]{});
		System.out.println(strArr[0]+"\t"+strArr[1]);
		
		Object[] objArr = arrList2.toArray();
		for(Object o : objArr){
			System.out.print(o+",");
		}
		System.out.println();
		
 		List<String> list= new ArrayList<String>();
		list.add("XX");
		list.add(0, "YY");
		list.add("aa");
		list.add("bb");
		List<String> arrSub = list.subList(1, 4);//[1,4) 以0开头
		System.out.println(arrSub);
	}
}

 

console print:

[代, eclipse, 刘备, 周瑜, 诸葛亮]
[代, eclipse]
代 eclipse
代,eclipse,
[XX, aa, bb]