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App.java
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173 lines (102 loc) · 2.51 KB
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public class App {
public static void main(String[] args) {
java.util.Scanner input = new java.util.Scanner(System.in);
int errorCount = 0; //错误次数
String lastErrorName = ""; //最后一次错误的账号
//如果输入用户名和密码连续错误3次，提示”账号冻结
while(errorCount < 3) {
System.out.println("请输入账号：");
String userName = input.next();
System.out.println("请输入密码：");
String password = input.next();
if("tom".equals(userName) && "123123".equals(password)) {
System.out.println("登录成功");
errorCount = 3;
} else {
if(!userName.equals(lastErrorName)) {
errorCount = 0;
lastErrorName = userName;
}
errorCount++;
if(errorCount == 3) {
System.out.println("账号被冻结");
}
}
}
/*
int i = 0;
while(i < 10) {
System.out.println(i);
i++;
}*/
/*
for(int i = 0;i < 10;i++) {
System.out.println(i);
}
*/
/*
java.util.Scanner input = new java.util.Scanner(System.in);
String name;
do {
System.out.println("请输入姓名:");
name = input.next();
if(!"quit".equals(name)) {
System.out.println("您的姓名是:" + name);
}
}while(!"quit".equals(name));
*/
/*
//先执行，再判断
int count = 10;
do{
System.out.println("hello," + count);
count--;
}while(count > 0);
*/
/*
//1. 获取班级总人数
java.util.Scanner input = new java.util.Scanner(System.in);
System.out.println("请输入班级总人数：");
int count = input.nextInt(); //总人数
//2. 输入每个同学的成绩，将成绩累加获得总成绩
int total = 0; //总成绩
int c = 0;
int i = 1;
while(i <= count) {
System.out.println("请输入第" + i +"个同学的成绩：");
int score = input.nextInt();
if(score >= 80) {
c++;
total += score;//total = total + score;
}
i++;
}
//3. 使用总成绩除以班级总人数，获取平均成绩
int avg = total / c;
//4. 输出平均成绩
System.out.println("总成绩为：" + total + " 平均成绩为：" + avg);
*/
/*
int count = 10;
while(count > 20) {
System.out.println("xxx");
count++;
}
*/
//.....
/*
int count = 1;
while(count <= 100) {
System.out.println(count + "只青蛙" + count + "张嘴，" + (count * 2) +"只眼睛" + (count * 4) +"条腿");
count++;
}
*/
/*
int count = 0; //初始化
while(count < 3) { //条件判断部分
System.out.println("Hello");
count++; //更改变量
}
*/
}
}