Student.java
public class Student {
//定义属性
int id;
String name;
int age;
int userFirstName;
double myScore;
//定义方法
public static int add(int num1,int num2) {
return num1+num2;
}
public static void add2(int num1,int num2) {
System.out.println(num1+num2);
}
public static void show() {
System.out.println("Hello World");
}
public static void main(String[] args) {
int num = add(1,1);
add2(1,1);
}
/**
* 无参构造
*/
public Student() {
}
/**
* 有参构造
*/
public Student(int num) {
}
public void test() {
}
}
Test.java
import java.util.Arrays;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
//初始化用户名
String[] nameArray = {"张三","李四","王五","小明"};
//初始化用户年龄
int[] ageArray = {22,23,20,22};
//初始化用户状态
String[] stateArray = {"正常","正常","正常","正常"};
Scanner scanner = new Scanner(System.in);
int num;
String name;
int age;
int index = 0;
boolean flag;
do {
System.out.println("欢迎使用用户管理系统");
System.out.println("1.查询用户");
System.out.println("2.添加用户");
System.out.println("3.删除用户");
System.out.println("4.账号冻结");
System.out.println("5.账号解封");
System.out.println("6.退出系统");
System.out.print("请选择：");
num = scanner.nextInt();
switch(num) {
case 1:
System.out.println("------ 查询用户 ------");
System.out.println("编号\t\t姓名\t\t年龄\t\t状态\t\t");
for(int i=0;i<nameArray.length;i++) {
System.out.println((i+1)+"\t\t"+nameArray[i]+"\t\t"+ageArray[1]+"\t\t"+stateArray[i]);
}
System.out.print("输入0返回：");
num = scanner.nextInt();
break;
case 2:
System.out.println("------ 添加用户 ------");
System.out.print("请输入用户姓名：");
name = scanner.next();
flag = isNameExist(name, nameArray);
if(flag == true) {
System.out.println(name+"已存在！");
}else {
System.out.print("请输入用户年龄：");
age = scanner.nextInt();
nameArray = Arrays.copyOf(nameArray, nameArray.length+1);
nameArray[nameArray.length-1] = name;
ageArray = Arrays.copyOf(ageArray, ageArray.length+1);
ageArray[ageArray.length-1] = age;
stateArray = Arrays.copyOf(stateArray, stateArray.length+1);
stateArray[stateArray.length-1] = "正常";
System.out.println("添加成功！");
}
System.out.print("输入0返回：");
num = scanner.nextInt();
break;
case 3:
System.out.println("------ 删除用户 ------");
System.out.print("请输入要删除的用户名：");
name = scanner.next();
flag = isNameExist(name, nameArray);
if(flag != true) {
System.out.println(name+"不存在，请重新输入！");
}else {
index = getIndex(name, nameArray);
String[] newNameArray = new String[nameArray.length-1];
int[] newAgeArray = new int[ageArray.length-1];
String[] newStateArray = new String[stateArray.length-1];
for(int i=0;i<index;i++) {
newNameArray[i] = nameArray[i];
newAgeArray[i] = ageArray[i];
newStateArray[i] = stateArray[i];
}
for(int i=index;i<newNameArray.length;i++) {
newNameArray[i] = nameArray[i+1];
newAgeArray[i] = ageArray[i+1];
newStateArray[i] = stateArray[i+1];
}
nameArray = newNameArray;
ageArray = newAgeArray;
stateArray = newStateArray;
System.out.println(name+"删除成功！");
}
System.out.print("输入0返回：");
num = scanner.nextInt();
break;
case 4:
System.out.println("------ 账号冻结 ------");
System.out.print("请输入要冻结的用户名：");
name = scanner.next();
flag = isNameExist(name, nameArray);
if(!flag) {
System.out.println(name+"不存在，请重新输入！");
}else {
index = getIndex(name, nameArray);
if(stateArray[index].equals("冻结")) {
System.out.println(name+"已冻结！");
}else {
stateArray[index] = "冻结";
System.out.println(name+"冻结成功！");
}
}
System.out.print("输入0返回：");
num = scanner.nextInt();
break;
case 5:
System.out.println("------ 账号解封 ------");
System.out.print("请输入要解封的用户名：");
name = scanner.next();
//判断name是否存在
flag = isNameExist(name, nameArray);
if(!flag) {
System.out.println(name+"不存在，请重新输入！");
}else {
index = getIndex(name, nameArray);
if(stateArray[index].equals("正常")) {
System.out.println(name+"状态正常！");
}else {
stateArray[index] = "正常";
System.out.println(name+"解封成功！");
}
}
System.out.print("输入0返回：");
num = scanner.nextInt();
break;
case 6:
System.out.println("感谢使用用户管理系统！");
break;
}
}while(num == 0);
}
//检测用户输入的名称是否存在
public static boolean isNameExist(String name,String[] nameArray) {
boolean flag = false;
for(int i = 0; i < nameArray.length;i++) {
if(name.equals(nameArray[i])) {
flag = true;
break;
}
}
return flag;
}
//如果用户名存在，获取其下标
public static int getIndex(String name,String[] nameArray) {
int index = 0;
for(int i = 0; i < nameArray.length;i++) {
if(name.equals(nameArray[i])) {
index = i;
break;
}
}
return index;
}
}
User.java
public class User {
//属性
private long id;
private String name;
private char gender;
private String password;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public char getGender() {
return gender;
}
public void setGender(char gender) {
this.gender = gender;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public static void show() {
System.out.println("用户信息如下：");
// System.out.println(this.id);
// System.out.println(this.name);
// System.out.println(this.gender);
// System.out.println(this.password);
}
}
UserTest.java
public class UserTest {
public static void main(String[] args) {
// User user = new User();
// user.setId(-10);
// user.setName("张三");
// user.setGender(‘男‘);
// user.setPassword("123123");
// user.show();
User.show();
}
}
原文地址：https://www.cnblogs.com/HiJackykun/p/11172075.html
时间： 2024-08-30 11:33:44