import java.util.HashMap;
import java.util.Map;
public class HashMapGetValueOfkey {
public static void main(String[] args) {
Map<Integer,String> hm = new HashMap<Integer,String>();
/*
* Associates the specified value with the specified key in
this map (optional operation). If the map previously
contained a mapping for the key, the old value is
replaced by the specified value
*/
hm.put(1,"ankush");
hm.put(2, "amit");
hm.put(3,"shivam");
hm.put(4,"ankit");
hm.put(5, "yogesh");
/*
* Returns the value to which the specified
* key is mapped, or null if this map contains
* no mapping for the key.
*/
System.out.println(" key = 1 and value = "+hm.get(1));
System.out.println(" key = 1 and value = "+hm.get(10));
System.out.println(" key = 1 and value = "+hm.get(5));
System.out.println(" key = 1 and value = "+hm.get(4));
}
}
Output:
key = 1 and value = ankush
key = 1 and value = null
key = 1 and value = yogesh
key = 1 and value = ankit
import java.util.Map;
public class HashMapGetValueOfkey {
public static void main(String[] args) {
Map<Integer,String> hm = new HashMap<Integer,String>();
/*
* Associates the specified value with the specified key in
this map (optional operation). If the map previously
contained a mapping for the key, the old value is
replaced by the specified value
*/
hm.put(1,"ankush");
hm.put(2, "amit");
hm.put(3,"shivam");
hm.put(4,"ankit");
hm.put(5, "yogesh");
/*
* Returns the value to which the specified
* key is mapped, or null if this map contains
* no mapping for the key.
*/
System.out.println(" key = 1 and value = "+hm.get(1));
System.out.println(" key = 1 and value = "+hm.get(10));
System.out.println(" key = 1 and value = "+hm.get(5));
System.out.println(" key = 1 and value = "+hm.get(4));
}
}
Output:
key = 1 and value = ankush
key = 1 and value = null
key = 1 and value = yogesh
key = 1 and value = ankit
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