java中list和array的转换

JAVA中List与Array之间互换

1、List转Array

ArrayList<String> list = new ArrayList<String>();
list.add("dff1");
list.add("dff2");
list.add("dff3");
list.add("dff4");
list.add("dff5");
String[] array = new String[list.size()];
String[] s=list.toArray(array);
System.out.println(Arrays.toString(s));

最好用new的方式构建，因为toArray默认转换为Object[]对象！

 

2、Array转List

String[] string=new String[]{"s1","s2","s3","s4","s5"};

List<String> li= Arrays.asList(string);

System.out.println(li);