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Convert an object to another type using map() method with Lambda in Java?
In Java 8, we have the ability to convert an object to another type using a map() method of Stream object with a lambda expression. The map() method is an intermediate operation in a stream object, so we need a terminal method to complete the stream.
Syntax
<R>Stream <R> map(Function<? super T,? extends R> mapper)
Example
import java.util.*;
import java.util.stream.*;
public class EmployeeInformationTest {
public static void main(String args[]) {
List<Employee> employees = Arrays.asList(
new Employee("Jai"),
new Employee("Adithya"),
new Employee("Raja"));
List<String> names = employees.stream()
.map(s -> s.getEmployeeName()) // Lambda Expression
.collect(Collectors.toList());
System.out.println(names);
}
}
// Employee class
class Employee {
private String empName;
private String empDesignation;
public Employee(String empName) {
this.empName = empName;
}
public String getEmployeeName() {
return empName;
}
public void setEmployeeName(String empName) {
this.empName = empName;
}
public String getEmployeeDesignation() {
return empDesignation;
}
public void setEmployeeDesignation(String empDesignation) {
this.empDesignation = empDesignation;
}
}Output
[Jai, Adithya, Raja]
Updated on: 11-Jul-2020
7K+ Views
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