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()
