java实例教程，员工工资筛选排序大比拼

Java实例教程：员工工资筛选排序大比拼

大家好，我是你们的Java小编，今天咱们就来一场硬核比拼——员工工资筛选排序。下面这5个高难度每一个都能让编程新手挠破头，但看完我的详细解答，分分钟让你化身Java达人！

1.如何从员工集合中筛选出工资大于8000的员工？

java

importjava.util.ArrayList;

importjava.util.List;

publicclassSalaryFilter{

publicstaticvoidmain(String[]args){

Listemployees=newArrayList<>();

employees.add(newEmployee(1,"张三",8500));

employees.add(newEmployee(2,"李四",6000));

employees.add(newEmployee(3,"王五",10000));

ListfilteredEmployees=newArrayList<>();

for(Employeeemployee:employees){

if(employee.getSalary()>8000){

filteredEmployees.add(employee);

System.out.println(filteredEmployees);

2.怎样统计员工的最高薪资、平均薪资和薪资之和？

java

importjava.util.ArrayList;

importjava.util.List;

publicclassSalaryStatistics{

publicstaticvoidmain(String[]args){

Listemployees=newArrayList<>();

employees.add(newEmployee(1,"张三",8500));

employees.add(newEmployee(2,"李四",6000));

employees.add(newEmployee(3,"王五",10000));

intmaxSalary=0;

inttotalSalary=0;

for(Employeeemployee:employees){

if(employee.getSalary()>maxSalary){

maxSalary=employee.getSalary();

totalSalary+=employee.getSalary();

doubleaverageSalary=(double)totalSalary/employees.size();

System.out.println("最高薪资："+maxSalary);

System.out.println("平均薪资："+averageSalary);

System.out.println("薪资之和："+totalSalary);

3.如何将员工按工资从高到低排序，相同工资者年龄小者在前？

java

importjava.util.ArrayList;

importjava.util.Collections;

importjava.util.Comparator;

importjava.util.List;

publicclassSalarySort{

publicstaticvoidmain(String[]args){

Listemployees=newArrayList<>();

employees.add(newEmployee(1,"张三",8500,25));

employees.add(newEmployee(2,"李四",6000,30));

employees.add(newEmployee(3,"王五",10000,28));

employees.add(newEmployee(4,"赵六",10000,32));

Collections.sort(employees,newComparator

@Override

publicintcompare(Employeee1,Employeee2){

intsalaryCompare=e2.getSalary()-e1.getSalary();

if(salaryCompare==0){

returne1.getAge()-e2.getAge();

returnsalaryCompare;

System.out.println(employees);

4.预计难度10星：如何用正则表达式从文本中提取所有手机号？

java

importjava.util.regex.Matcher;

importjava.util.regex.Pattern;

publicclassPhoneNumberExtractor{

publicstaticvoidmain(String[]args){

Stringtext="我的手机号是13512345678，也有人打电话过来18698765432.";

Patternpattern=Pattern.compile("1[3-9]\\d{9}");

Matchermatcher=pattern.matcher(text);

while(matcher.find()){

System.out.println(matcher.group());

5.设计一个优雅的算法，判断一棵二叉树是否是平衡二叉树

java

importjava.util.LinkedList;

importjava.util.Queue;

publicclassBalancedBinaryTree{

publicbooleanisBalanced(TreeNoderoot){

if(root==null){

returntrue;

Queuequeue=newLinkedList<>();

queue.add(root);

while(!queue.isEmpty()){

TreeNodenode=queue.poll();

intleftHeight=height(node.left);

intrightHeight=height(node.right);

if(Math.abs(leftHeight-rightHeight)>1){

returnfalse;

queue.add(node.left);

queue.add(node.right);

returntrue;

privateintheight(TreeNodenode){

if(node==null){

return0;

returnMath.max(height(node.left),height(node.right))+1;

经过了这5个高难度拷问，各位铁粉们是不是都心满意足了？掌握了这些核心技术，你的Java水平绝对是杠杠的。不过，还有更多有趣的Java知识等着你们来探索哦！

给我留言

如果你还有任何疑问或想让我讲解其他Java实例，欢迎给我留言。你们的支持就是我码字的动力！

上一篇：java初级程序设计，揭开WHILE1的神秘面纱

下一篇：优秀网页设计赏析：从理论到实例，揭秘网页设计的魅力？