/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Map
<String, List
<Integer
>> m
= new HashMap
<>(); m.
put("test",
new ArrayList
<Integer
>(Arrays.
asList(1,
2,
3))); m.
put("test2",
new ArrayList
<Integer
>(Arrays.
asList(2,
3,
4)));
List<Integer> flattenList = new ArrayList<>();
for(List<Integer> list : m.values()){
flattenList.add(i);
}
System.
out.
println(flattenList
); }
}
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