Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Java Program to create a new list with values from existing list with Lambda Expressions
To create a new list with values from existing list with Lambda Expressions, the following is an example.
Here, we are displaying the name of Employees. Therefore, we have created an Employee class as well −
List<Employee>emp = Arrays.asList(new Employee("Jack", 29, "South"), new Employee("Tom", 24, "North"), new Employee("Harry", 35, "West"),new Employee("Katie", 32, "East"));Use Lambda to crate anew list from existing list with Lambda Expressions −
List<String>res = emp.stream().map(u ->u.displayEmpName()).collect(Collectors.toList());
Let us see the complete example −
Example
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
public class Demo {
public static void main(String args[]) {
List<Employee>emp = Arrays.asList(new Employee("Jack", 29, "South"), new Employee("Tom", 24, "North"),
new Employee("Harry", 35, "West"),new Employee("Katie", 32, "East"));
List<String>res = emp.stream().map(u ->u.displayEmpName()).collect(Collectors.toList());
System.out.println("Employee Names = "+res);
}
}
class Employee {
private String emp_name;
private int emp_age;
private String emp_zone;
public Employee(String emp_name, int emp_age, String emp_zone) {
this.emp_name = emp_name;
this.emp_age = emp_age;
this.emp_zone = emp_zone;
}
public String displayEmpName() {
return this.emp_name;
}
}Output
Employee Names = [Jack, Tom, Harry, Katie]
Updated on: 30-Jul-2019
2K+ Views
Advertisements