java-测试开发list清除排序及数组转list

package java_test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

class clearListDemo{//清除list
	public void clearList(){
		List<String> list=new ArrayList<String>();
		list.add("a");
		boolean e=list.isEmpty();
		System.out.println(e);
		list.clear();//清除list里的所有元素
		boolean m=list.isEmpty();
		System.out.println(m);
		System.out.println(list);
	}
	public void sortList(){//list排序
		List<String> list=new ArrayList<String>();
		list.add("d");
		list.add("c");
		list.add("a");
		Collections.sort(list);//集合排序，升序排序
		System.out.println(list);
	}

}


public class arrayToArrayListDemo {

	public static void main(String[] args) {
		Integer [] i=new Integer[]{1,2,3};
		List<Integer> t=Arrays.asList(i);
		List<Integer> list =new ArrayList<>(t);//将数组转换为ArrayList的正确方式
		System.out.println(list);

		clearListDemo c=new clearListDemo();
		c.clearList();
		c.sortList();
	}
}