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Java Program to get Sub Map from TreeMap
To get Sub Map from TreeMap, let us first create a TreeMap and set key-value pair −
TreeMap<String, String>tMap = new TreeMap<String, String>(); tMap.put("1", "A"); tMap.put("2", "B"); tMap.put("3", "C"); tMap.put("4", "D"); tMap.put("5", "E"); tMap.put("6", "F"); tMap.put("7", "G");
Now, let’s say you need to get submap from 3 to 7. For that, use the method submap() as −
=SortedMap<String, String>map = tMap.subMap("3", "7");
Example
import java.util.SortedMap; import java.util.TreeMap; public class Demo { public static void main(String[] args) { TreeMap<String, String>tMap = new TreeMap<String, String>(); tMap.put("1", "A"); tMap.put("2", "B"); tMap.put("3", "C"); tMap.put("4", "D"); tMap.put("5", "E"); tMap.put("6", "F"); tMap.put("7", "G"); tMap.put("8", "H"); tMap.put("9", "I"); tMap.put("10", "J"); SortedMap<String, String>map = tMap.subMap("3", "7"); System.out.println("SortedMap = " + map); map = tMap.subMap("5", "7"); System.out.println("SortedMap = " + map); map = tMap.subMap("8", "8"); System.out.println("SortedMap = " + map); } }
Output
SortedMap= {3=C, 4=D, 5=E, 6=F} SortedMap = {5=E, 6=F} SortedMap = {}
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