189 8069 5689
//原来的匿名内部类
@Test
public void test1(){
Comparator comparator = new Comparator() {
@Override
public int compare(Integer o1, Integer o2) {
return Integer.compare(o1, o2);
}
};
TreeSet ts = new TreeSet<>(comparator);
} //Lambda表达式
@Test
public void test2(){
Comparator comparator = (x ,y) -> Integer.compare(x, y);
TreeSet ts = new TreeSet<>(comparator);
} 需求2：获取当前公司中员工工资大于5000的员工信息
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public class Employee {
private String name;
private int age;
private double salary;
public Employee() {
super();
}
public Employee(String name, int age, double salary) {
super();
this.name = name;
this.age = age;
this.salary = salary;
}
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;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
@Override
public String toString() {
return "Employee{" +
"name='" + name + '\'' +
", age=" + age +
", salary=" + salary +
'}';
}
}List employees = Arrays.asList(
new Employee("张三", 18 ,9999.99),
new Employee("李四", 38, 5555.99),
new Employee("王五", 50, 6666.66),
new Employee("赵六", 16, 3333.33),
new Employee("田七", 8, 7777.77)
); @Test
public void test3(){
//获取年龄大于35岁的员工信息
List employeeList = filterEmployee(employees);
System.out.println("年龄大于35岁的员工信息：");
for (Employee employee : employeeList){
System.out.println(employee);
}
//获取当前公司中员工工资大于5000的员工信息
List employeeList1 = filterEmployees2(employees);
System.out.println("工资大于5000的员工信息：");
for (Employee employee : employeeList1){
System.out.println(employee);
}
}
获取当前公司中员工年龄大于35的员工信息
public List filterEmployee(List employeeList){
List emps = new ArrayList<>();
for (Employee emp : employeeList){
if (emp.getAge() >= 35){
emps.add(emp);
}
}
return emps;
}
获取当前公司中员工工资大于5000的员工信息
public List filterEmployees2(List employeeList){
ArrayList employees = new ArrayList<>();
for (Employee employee : employeeList){
if (employee.getSalary() >= 5000){
employees.add(employee);
}
}
return employees;
} public interface MyPredicate {
public boolean test(T t);
} public class FilterEmployeeByAge implements MyPredicate{
@Override
public boolean test(Employee employee) {
return employee.getAge() >= 35;
}
} public class FilterEmployeeBySalary implements MyPredicate{
@Override
public boolean test(Employee employee) {
return employee.getSalary() >= 5000;
}
} @Test
public void test4(){
List employeeList = filterEmployee(employees, new FilterEmployeeByAge());
System.out.println("年龄大于35岁的员工信息：");
for (Employee employee : employeeList){
System.out.println(employee);
}
System.out.println("工资大于5000的员工信息：");
List employeeList1 = filterEmployee(this.employees, new FilterEmployeeBySalary());
for (Employee employee : employeeList1){
System.out.println(employee);
}
}
public List filterEmployee(List employeeList, MyPredicate mp){
ArrayList employees = new ArrayList<>();
for (Employee employee : employeeList){
if (mp.test(employee)){
employees.add(employee);
}
}
return employees;
} public interface MyPredicate {
public boolean test(T t);
} @Test
public void test5(){
List employeeList = filterEmployee(employees, new MyPredicate() {
@Override
public boolean test(Employee employee) {
return employee.getAge() >= 35;
}
});
System.out.println("年龄大于35岁的员工信息：");
for (Employee employee : employeeList){
System.out.println(employee);
}
List employeeList1 = filterEmployee(employees, new MyPredicate() {
@Override
public boolean test(Employee employee) {
return employee.getSalary() >= 5000;
}
});
System.out.println("工资大于5000的员工信息：");
for (Employee employee : employeeList1){
System.out.println(employee);
}
} public List filterEmployee(List employeeList, MyPredicate mp){
ArrayList employees = new ArrayList<>();
for (Employee employee : employeeList){
if (mp.test(employee)){
employees.add(employee);
}
}
return employees;
} @Test
public void test6(){
System.out.println("年龄大于35岁的员工信息：");
List employeeList = filterEmployee(employees, (e) -> e.getAge() >= 35);
employeeList.forEach(System.out::println);
System.out.println("工资大于5000的员工信息：");
List employeeList1 = filterEmployee(employees, (e) -> e.getSalary() >= 5000);
employeeList1.forEach(System.out::println);
} @Test
public void test7(){
System.out.println("年龄大于35岁的员工信息：");
employees.stream()
.filter((e) -> e.getAge() >= 35)
.forEach(System.out::println);
System.out.println("工资大于5000的员工信息：");
employees.stream()
.filter((e) -> e.getSalary() >= 5000)
.forEach(System.out::println);
}