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# Java Examples - Print Collection

## Problem Description:

How to print a collection?

## Solution:

Following example how to print a collection by using tMap.keySet(),tMap.values() and tMap.firstKey() methods of Java Util class .

    import java.util.*;

    public class TreeExample{
       public static void main(String[] args) {
          System.out.println("Tree Map Example!\n");
          TreeMap tMap = new TreeMap();
          tMap.put(1, "Sunday");
          tMap.put(2, "Monday");
          tMap.put(3, "Tuesday");
          tMap.put(4, "Wednesday");
          tMap.put(5, "Thursday");
          tMap.put(6, "Friday");
          tMap.put(7, "Saturday");
          System.out.println("Keys of tree map: "
          + tMap.keySet());
          System.out.println("Values of tree map: "
          + tMap.values());
          System.out.println("Key: 5 value: " + tMap.get(5)+ "\n");
          System.out.println("First key: " + tMap.firstKey()
          + " Value: "
          + tMap.get(tMap.firstKey()) + "\n");
          System.out.println("Last key: " + tMap.lastKey()
    	  + " Value: "+ tMap.get(tMap.lastKey()) + "\n");
          System.out.println("Removing first data: "
          + tMap.remove(tMap.firstKey()));
          System.out.println("Now the tree map Keys: "
          + tMap.keySet());
          System.out.println("Now the tree map contain: "
          + tMap.values() + "\n");
          System.out.println("Removing last data: "
          + tMap.remove(tMap.lastKey()));
          System.out.println("Now the tree map Keys: "
          + tMap.keySet());
          System.out.println("Now the tree map contain: "
          + tMap.values());
       }
    }

## Result:

The above code sample will produce the following result.

    C:\collection>javac TreeExample.java

    C:\collection>java TreeExample
    Tree Map Example!

    Keys of tree map: [1, 2, 3, 4, 5, 6, 7]
    Values of tree map: [Sunday, Monday, Tuesday, Wednesday,
    Thursday, Friday, Saturday]
    Key: 5 value: Thursday

    First key: 1 Value: Sunday

    Last key: 7 Value: Saturday

    Removing first data: Sunday
    Now the tree map Keys: [2, 3, 4, 5, 6, 7]
    Now the tree map contain: [Monday, Tuesday, Wednesday,
    Thursday, Friday, Saturday]

    Removing last data: Saturday
    Now the tree map Keys: [2, 3, 4, 5, 6]
    Now the tree map contain: [Monday, Tuesday, Wednesday,
    Thursday, Friday]

    C:\collection>

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