Java nima Java dasturlash tili

For loop orqali

While loop + iterator

Misol:

import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
public class Details
{
public static void main(String [] args)
{
HashMap hmap = new HashMap();
//Adding elements to HashMap
hmap.put(11, "AB");
hmap.put(2, "CD");
hmap.put(33, "EF");
hmap.put(9, "GH");
hmap.put(3, "IJ");

//FOR LOOP

System.out.println("For Loop:");
for (Map.Entry me : hmap.entrySet()) {
System.out.println("Key: "+me.getKey() + " & Value: " + me.getValue());
}

//WHILE LOOP & ITERATOR

System.out.println("While Loop:");
Iterator iterator = hmap.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry me2 = (Map.Entry) iterator.next();
System.out.println("Key: "+me2.getKey() + " & Value: " + me2.getValue());
}
}
}

Ekranda:

For Loop:
Key: 2 & Value: CD
Key: 3 & Value: IJ
Key: 33 & Value: EF
Key: 9 & Value: GH
Key: 11 & Value: AB
While Loop:
Key: 2 & Value: CD
Key: 3 & Value: IJ
Key: 33 & Value: EF
Key: 9 & Value: GH
Key: 11 & Value: AB

HashMap ni key orqali saralash

Bu misolda HashMap ning key ni TreeMap dan foydalain saralash usulini ko’ramiz.

import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import java.util.Set;
import java.util.Iterator;

public class Details {

public static void main(String[] args) {

HashMap hmap = new HashMap();

hmap.put(5, "A");
hmap.put(11, "C");
hmap.put(4, "Z");
hmap.put(77, "Y");
hmap.put(9, "P");
hmap.put(66, "Q");
hmap.put(0, "R");

System.out.println("Saralashdan oldin:");

Set set = hmap.entrySet();
Iterator iterator = set.iterator();
while(iterator.hasNext()) {
Map.Entry me = (Map.Entry)iterator.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
Map map = new TreeMap(hmap);
System.out.println("Saralashdan keyin:");
Set set2 = map.entrySet();
Iterator iterator2 = set2.iterator();
while(iterator2.hasNext()) {
Map.Entry me2 = (Map.Entry)iterator2.next();
System.out.print(me2.getKey() + ": ");
System.out.println(me2.getValue());
}
}
}