42 lines
1.2 KiB
Java
42 lines
1.2 KiB
Java
// collectionsindepth/SortedMapDemo.java
|
|
// (c)2016 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
|
|
// What you can do with a TreeMap
|
|
import java.util.*;
|
|
import onjava.*;
|
|
|
|
public class SortedMapDemo {
|
|
public static void main(String[] args) {
|
|
TreeMap<Integer,String> sortedMap =
|
|
new TreeMap<>(new CountMap(10));
|
|
System.out.println(sortedMap);
|
|
Integer low = sortedMap.firstKey();
|
|
Integer high = sortedMap.lastKey();
|
|
System.out.println(low);
|
|
System.out.println(high);
|
|
Iterator<Integer> it = sortedMap.keySet().iterator();
|
|
for(int i = 0; i <= 6; i++) {
|
|
if(i == 3) low = it.next();
|
|
if(i == 6) high = it.next();
|
|
else it.next();
|
|
}
|
|
System.out.println(low);
|
|
System.out.println(high);
|
|
System.out.println(sortedMap.subMap(low, high));
|
|
System.out.println(sortedMap.headMap(high));
|
|
System.out.println(sortedMap.tailMap(low));
|
|
}
|
|
}
|
|
/* Output:
|
|
{0=A0, 1=B0, 2=C0, 3=D0, 4=E0, 5=F0, 6=G0, 7=H0, 8=I0,
|
|
9=J0}
|
|
0
|
|
9
|
|
3
|
|
7
|
|
{3=D0, 4=E0, 5=F0, 6=G0}
|
|
{0=A0, 1=B0, 2=C0, 3=D0, 4=E0, 5=F0, 6=G0}
|
|
{3=D0, 4=E0, 5=F0, 6=G0, 7=H0, 8=I0, 9=J0}
|
|
*/
|