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Commit c1213e4

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author
Rajeev Kumar Singh
committed
More examples
1 parent d5c5b47 commit c1213e4

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2 files changed

+45
-8
lines changed

2 files changed

+45
-8
lines changed

‎java-treemap-examples/src/AccessRemoveEntriesFromTreeMapExample.java‎ renamed to ‎java-treemap-examples/src/AccessEntriesFromTreeMapExample.java‎

Lines changed: 6 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,9 +1,10 @@
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import java.util.Map;
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import java.util.TreeMap;
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public class AccessRemoveEntriesFromTreeMapExample {
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public class AccessEntriesFromTreeMapExample {
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public static void main(String[] args) {
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TreeMap<Integer, String> employees = new TreeMap<>();
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employees.put(1003, "Rajeev");
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employees.put(1001, "James");
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employees.put(1002, "Sachin");
@@ -24,19 +25,16 @@ public static void main(String[] args) {
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System.out.println("Employee does not exist with id : " + id);
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}
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// Find the first and last entry
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System.out.println("First entry in employees map : " + employees.firstEntry());
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System.out.println("Last entry in employees map : " + employees.lastEntry());
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// Find the entry whose key is just less than the given key
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Map.Entry<Integer, String> employeeJustBelow = employees.lowerEntry(1002);
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System.out.println("Employee just below id 1002 : " + employeeJustBelow);
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// Find the entry whose key is just higher than the given key
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Map.Entry<Integer, String> employeeJustAbove = employees.higherEntry(1002);
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System.out.println("Employee just above id 1002 : " + employeeJustAbove);
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System.out.println("First entry in employees map : " + employees.firstEntry());
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System.out.println("Last entry in employees map : " + employees.lastEntry());
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// Removing a key from the TreeMap
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String name = employees.remove(1003);
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System.out.println("Removed employee (1003 : " + name + "), New TreeMap " + employees);
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}
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}
Lines changed: 39 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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import java.util.Map;
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import java.util.TreeMap;
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public class RemoveEntriesFromTreeMapExample {
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public static void main(String[] args) {
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TreeMap<String, String> countryISOCodeMapping = new TreeMap<>();
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countryISOCodeMapping.put("India", "IN");
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countryISOCodeMapping.put("United States of America", "US");
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countryISOCodeMapping.put("China", "CN");
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countryISOCodeMapping.put("United Kingdom", "UK");
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countryISOCodeMapping.put("Russia", "RU");
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countryISOCodeMapping.put("Japan", "JP");
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System.out.println("CountryISOCodeMapping : " + countryISOCodeMapping);
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// Remove the mapping for a given key
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String countryName = "Japan";
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String isoCode = countryISOCodeMapping.remove(countryName);
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if(isoCode != null) {
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System.out.println("Removed (" + countryName + " => " + isoCode + ") from the TreeMap. New TreeMap " + countryISOCodeMapping);
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} else {
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System.out.println(countryName + " does not exist, or it is mapped to a null value");
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}
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// Remove the mapping for a given key only if it is mapped to a given value
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countryName = "India";
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boolean isRemoved = countryISOCodeMapping.remove(countryName, "IA");
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System.out.println("Was the mapping removed for " + countryName + "? : " + isRemoved);
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// Remove the first entry from the TreeMap
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Map.Entry<String, String> firstEntry = countryISOCodeMapping.pollFirstEntry();
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System.out.println("Removed firstEntry : " + firstEntry + ", New TreeMap : " + countryISOCodeMapping);
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// Remove the last entry from the TreeMap
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Map.Entry<String, String> lastEntry = countryISOCodeMapping.pollLastEntry();
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System.out.println("Removed lastEntry : " + lastEntry + ", New TreeMap : " + countryISOCodeMapping);
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}
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}

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