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爲什麼此代碼不能編譯。我正在學習Java中的Predicate。下面是代碼Java 8 Innner類實例化
package com.java8.lambda.predicate;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import com.java8.lambda.pojo.Employee;
public class PredicateSample {
public static void main(String[] args) {
Employee permanentEmployee = new Employee(70, "Jagmohan", "Sanyal", new Date(), 'M', 19900.87,"P");
Employee tempEmployee = new Employee(70, "Shruti", "Bhatia", new Date(), 'F', 1990.87,"C");
List<Employee> empList = new ArrayList<>();
empList.add(permanentEmployee);
empList.add(tempEmployee);
PredicateSample predicateSample = new PredicateSample();
//Code doesn't compile on this line due to non-visibility of EmployeePredicate class
//It fails with "PredicateSample.EmployeePredicate cannot be resolved to a type"
EmployeePredicate empPredicate = new PredicateSample().new EmployeePredicate();
}
}
class EmployeePredicate {
public Predicate<Employee> getOlderEmployee(){
return p -> p.getAge() > 60 && p.getEmploymentType().equalsIgnoreCase("P");
}
public List<Employee> filter(List<Employee> employees, Predicate<Employee> p){
return employees.stream().filter(p).collect(Collectors.toList());
}
}
我已經通過下面的鏈接Inner Class Instantiation
走後,我也經歷了其他網站,但無法找出問題。
'EmployeePredicate'不是'PredicateSample'的內部類, –