AbstractMap.SimpleEntry<K, V> is used to maintain a key and a value entry. The value can be changed using the setValue method. This class facilitates the process of building custom map implementations.
toString() method of AbstractMap.SimpleEntry<K, V> returns a String representation of this SimpleEntry map entry. This method returns the string representation of this map entry’s key followed by the equals character (“=”) followed by the string representation of this entry’s value.
Syntax:
public String toString()
Parameters: This method accepts nothing.
Return value: This method returns a String representation of this map entry.
Below programs illustrate toString() method:
Program 1:
// Java program to demonstrate // AbstractMap.SimpleEntry.toString() method import java.util.*;
import java.util.AbstractMap.SimpleEntry;
public class GFG {
@SuppressWarnings ({ "unchecked" , "rawtypes" })
public static void main(String[] args)
{
// create a ArrayList of Map
ArrayList<AbstractMap
.SimpleEntry<Integer, Integer> >
arrayList
= new ArrayList<AbstractMap
.SimpleEntry<Integer, Integer> >();
// add values
arrayList.add( new AbstractMap.SimpleEntry( 0 , 123 ));
arrayList.add( new AbstractMap.SimpleEntry( 1 , 130 ));
arrayList.add( new AbstractMap.SimpleEntry( 2 , 994 ));
// print keys
for ( int i = 0 ; i < arrayList.size(); i++) {
// get map from list
AbstractMap.SimpleEntry<Integer, Integer>
map
= arrayList.get(i);
// get representation of map using toString()
String value = map.toString();
System.out.println(value);
}
}
} |
0=123 1=130 2=994
Program 2:
// Java program to demonstrate // AbstractMap.SimpleEntry.toString() method import java.util.*;
public class GFG {
@SuppressWarnings ({ "unchecked" , "rawtypes" })
public static void main(String[] args)
{
// create a ArrayList of Map
ArrayList<AbstractMap
.SimpleEntry<String, String> >
arrayList
= new ArrayList<AbstractMap
.SimpleEntry<String, String> >();
// add values
arrayList.add( new AbstractMap
.SimpleEntry( " 001AB " , " Emp 1" ));
arrayList.add( new AbstractMap
.SimpleEntry( " 011AC " , " Emp 2" ));
arrayList.add( new AbstractMap
.SimpleEntry( " 111AD " , " Emp 3" ));
arrayList.add( new AbstractMap
.SimpleEntry( " 101BE " , " Emp 4" ));
arrayList.add( new AbstractMap
.SimpleEntry( " 110CE " , " Emp 5" ));
// print keys
for ( int i = 0 ; i < arrayList.size(); i++) {
// get map from list
AbstractMap.SimpleEntry<String, String>
map
= arrayList.get(i);
// get representation of map using toString()
String value = map.toString();
System.out.println(value);
}
}
} |
001AB = Emp 1 011AC = Emp 2 111AD = Emp 3 101BE = Emp 4 110CE = Emp 5
References: https://docs.oracle.com/javase/10/docs/api/java/util/AbstractMap.SimpleEntry.html#toString()