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Java 8 Features > Stream API > Convert List to Map

Convert List to Map

Author: Venkata Sudhakar

The below example shows how to convert Object list into a Map

package com.bethecoder.java8.streams;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class StreamToMapExample {

public static void main(String[] args) {
		List<Student> sudents = Arrays.asList(
				new Student(1, "Sriram", 10),
				new Student(2, "Tanvie", 6),
				new Student(3, "Charan", 10)
		);
		
		Map<Integer, String> studentMap = sudents.stream()
				.collect(Collectors.toMap(Student::getId, Student::getName));
	
		System.out.println(studentMap);
	}

private static class Student {
		private int id;
		private String name;
		private int age;

public Student(int id, String name, int age) {
			this.id = id;
			this.name = name;
			this.age = age;
		}

public int getId() {
			return id;
		}

public void setId(int id) {
			this.id = id;
		}

public String getName() {
			return name;
		}

public void setName(String name) {
			this.name = name;
		}

public int getAge() {
			return age;
		}

public void setAge(int age) {
			this.age = age;
		}

}
}

It gives the following output,

{1=Sriram, 2=Tanvie, 3=Charan}

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