list,set,map,数组间的相互转换

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list,set,map,数组间的相互转换

1.list转set Set set = new HashSet( new ArrayList()); 2.set转list List list = new ArrayList( new HashSet()); 3.数组转为list List stooges = Arrays.asList( "Larry" , "Moe" , "Curly" ); 此时stooges中有有三个元素.注意:此时的list不能进行add操作,否则会报…

list,set,map,数组之间的相互转换详细解析

1.list转setSet set = new HashSet(new ArrayList()); 2.set转listList list = new ArrayList(new HashSet()); 3.数组转为listList stooges = Arrays.asList("Larry", "Moe", "Curly");或者String[] arr = {"1", "2"};List list =…

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一.ArrayList转换为数组ArrayList提供public <T> T[] toArray(T[] a)方法返回一个按照正确的顺序包含此列表中所有元素的数组,返回数组的运行时类型就是指定数组的运行时类型. import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) { List<String> list=new Ar…

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Uint47 calculator 题目链接(点击) In the distant space, there is a technologically advanced planet. One day they provided the Earth with a code that could achieve the ultimate meaning of the universe. People were very happy, but found that this code can onl…