Java优学网while循环教程：轻松掌握循环控制，告别无限循环烦恼

int target = 42; int guess = 0; while (guess != target) {

System.out.print("请输入你的猜测：");
// 这里应该有获取用户输入的代码
// 假设guess会被更新

}

int count = 0; while (count < 5) {

System.out.println("当前计数：" + count);
count++;

}

Scanner scanner = new Scanner(System.in); int userInput = 0; boolean isValid = false;

while (!isValid) {

System.out.print("请输入1-100之间的数字：");

if (scanner.hasNextInt()) {
    userInput = scanner.nextInt();
    if (userInput >= 1 && userInput <= 100) {
        isValid = true;
    } else {
        System.out.println("数字超出范围，请重新输入。");
    }
} else {
    System.out.println("输入的不是有效数字，请重新输入。");
    scanner.next(); // 清除无效输入
}

}

System.out.println("您输入的有效数字是：" + userInput);

// 经典的无限循环示例 int count = 0; while (count < 10) {

System.out.println("这是第" + count + "次循环");
// 忘记递增count，导致条件永远满足

}

// 遍历数组 - for循环更合适 for (int i = 0; i < array.length; i++) {

System.out.println(array[i]);

}