6.28 周末 ATM 学生管理系统项目

1、 ATM 用的数组来做登陆

package 取款机;

import javax.swing.JOptionPane;


public class Zhoumo1 {
public static String numzu[] = { "123", "456", "789" };


public static String pwdzu[] = { "123", "456", "789" };


public static int moneyzu[] = { 2000, 3000, 5000 };


public static int index = -1;


public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "欢迎光临威哥银行");
boolean t = login();
if (t == false) {
JOptionPane.showMessageDialog(null, "登陆失败");
System.exit(0);
} else {
JOptionPane.showMessageDialog(null, "登陆成功");
}
while (true) {
String i = JOptionPane.showInputDialog(null,
"请选择\n1、存款\n2、取款\n3、查询余额\n4、退卡");
int item = Integer.parseInt(i);
switch (item) {
case 1:
savemoney();
break;
case 2:
getmoney();
break;
case 3:
findmoney();
break;
case 4:
System.exit(0);
break;
default:
JOptionPane.showMessageDialog(null, "请输入1-4的选项");
break;


}
}


}


// 登陆界面
public static boolean login() {
for (int i = 0; i < 3; i++) {
String num = JOptionPane.showInputDialog(null, "输入卡号");
String pwd = JOptionPane.showInputDialog(null, "输入密码");
for (int j = 0; j < numzu.length; j++) {
if (num.equals(numzu[j]) && pwd.equals(pwdzu[j])) {
index = j;
return true;
}
}
JOptionPane.showMessageDialog(null, "账号或密码错误");
}
return false;
}


public static void savemoney() {
String a = JOptionPane.showInputDialog(null, "请把钱放在存款处");
int money = Integer.parseInt(a);


moneyzu[index] += money;
String s = JOptionPane.showInputDialog(null, "是否查余额 y\n");
if (s.equals("y")) {
findmoney();
}
}


public static void getmoney() {
String m=JOptionPane.showInputDialog(null,"请输入您要取走的钞票金额");
int money=Integer.parseInt(m);
if(money>moneyzu[index]){
JOptionPane.showMessageDialog(null, "S.B，余额不足");
}else{
moneyzu[index]-=money;
}
String s = JOptionPane.showInputDialog(null, "是否查余额 y\n");
if (s.equals("y")) {
findmoney();
}
}


public static void findmoney() {
JOptionPane.showMessageDialog(null, "您的账户余额为" + moneyzu[index]);
}

}

2、学生管理系统 自己定义了一个新的类型 .封装使用

import javax.swing.JOptionPane;


public class Zhoumo2 {
public static student2 student[] = new student2[20];


public static int num = 0;


public static int index = -1;


public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "欢迎登陆学生管理系统");
boolean right = login();
if (right == false) {
JOptionPane.showMessageDialog(null, "密码都不知道，滚蛋");
} else {
JOptionPane.showMessageDialog(null, "登陆成功");
}
while (true) {
String s = JOptionPane.showInputDialog(null,
"请输入选项\n1、添加\n2、显示\n3、删除\n4、修改\n5、查询\n6、排序\n7、退出");
int item = Integer.parseInt(s);
switch (item) {
case 1:
add();
break;
case 2:
show();
break;
case 3:
delete();
break;
case 4:
change();
break;
case 5:
find();
break;
case 6:
arrange();
break;
case 7:
System.exit(0);
break;
default:
JOptionPane.showMessageDialog(null, "请输入1-7的选项");
break;


}


}


}


public static boolean login() {
boolean t = false;
for (int i = 0; i < 3; i++) {
String z = JOptionPane.showInputDialog(null, "请输入账号");
String pwd = JOptionPane.showInputDialog(null, "请输入密码");
if (z.equals("123") && pwd.equals("123")) {
return true;
} else {
JOptionPane.showMessageDialog(null, "账号或密码错误");
}
}


return false;
}


public static void add() {
in(num);
num++;
}


public static void show() {
String str = "学号     姓名    成绩\n";
for (int i = 0; i < num; i++) {
str += student[i].code + "     " + student[i].name + "     "
+ student[i].grade + "\n";
}
JOptionPane.showMessageDialog(null, str);
}


public static void delete() {
int gg = findxx();
if (gg == -1) {
JOptionPane.showMessageDialog(null, "查无此人");
}
if (gg != -1) {
for (int i = index; i < student.length - 1; i++) {
student[i] = student[i + 1];
}
num--;
}
show();
}


public static void change() {
int gg = findxx();
if (gg == -1) {
JOptionPane.showMessageDialog(null, "查无此人");
} else {
in(index);
}
show();
}


public static void find() {
int gg = findxx();
if (gg == -1) {
JOptionPane.showMessageDialog(null, "查无此人");
} else {
JOptionPane.showMessageDialog(null, "学号   " + student[index].code
+ " 姓名     " + student[index].name + " 成绩   "
+ student[index].grade);
}
}


public static void arrange() {
for (int i = 0; i < num; i++) {
for (int j = i + 1; j < num; j++) {
if (student[i].grade < student[j].grade) {
student2 temp = student[i];
student[i] = student[j];
student[j] = temp;
}
}
}
show();
}


// 定位
public static int findxx() {
String name = JOptionPane.showInputDialog(null, "请输入学生的姓名");
for (int i = 0; i < num; i++) {
if (name.equals(student[i].name)) {
index = i;
return i;
}
}
return -1;
}


public static void in(int num) {
String code = JOptionPane.showInputDialog(null, "请输入学生学号");
String name = JOptionPane.showInputDialog(null, "请输入学生姓名");
String grade = JOptionPane.showInputDialog(null, "请输入学生成绩");


student2 s = new student2();
s.code = code;
s.name = name;
s.grade = Integer.parseInt(grade);
student[num] = s;
}


}