在Java 8中，我们可以使用带有lambda表达式的Stream对象的map()方法将对象转换为另一种类型。 map()方法是流对象中的中间操作，因此我们需要一种终端方法来完成流。
语法Stream map(Function super T,? extends R> mapper)
示例import java.util.*;
import java.util.stream.*;
public class EmployeeInformationTest {
public static void main(String args[]) {
List employees = Arrays.asList(
new Employee(“Jai”),
new Employee(“Adithya”),
new Employee(“Raja”));
List names = employees.stream()
.map(s -> s.getEmployeeName())//Lambda表达式
.collect(Collectors.toList());
System.out.println(names);
}
}
//Employee类
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;
}
}
输出结果[Jai, Adithya, Raja]