Java convert list to array 2018-10-18 21:48
We can use Arrays.asList() to init an array with values. This page will show you how to convert List<T> to T[]. For example convert List<String> to String[]. The code is here.
public class ListToArrayClient {
public static void main(String[] args) {
List<String> list = Arrays.asList("1", "2", "3");
System.out.println(list);
String[] strings = list.toArray(new String[0]);
for (String s : strings) {
System.out.println(s);
}
}
}
The output is here
[1, 2, 3]
1
2
3
It is very useful when you need pass params to the method like this print(String... params).
public class ListToArrayClient {
public static void main(String[] args) {
List<String> list = Arrays.asList("1", "2", "3");
System.out.println(list);
String[] strings = list.toArray(new String[0]);
print(strings);
}
private static void print(String... params) {
for (String s : params) {
System.out.println(s);
}
}
}
EOF