Java 如何进行do-while循环以检查输入验证
例如,我想要一个循环,打印出“你想看电影吗?”直到用户输入“是” 以下是我目前掌握的情况:Java 如何进行do-while循环以检查输入验证,java,Java,例如,我想要一个循环,打印出“你想看电影吗?”直到用户输入“是” 以下是我目前掌握的情况: import java.util.Scanner; public class Testing { public static void main(String args[]){ Scanner scan = new Scanner(System.in); do { System.out.println("Do you want to watc
import java.util.Scanner;
public class Testing {
public static void main(String args[]){
Scanner scan = new Scanner(System.in);
do {
System.out.println("Do you want to watch a movie?");
scan.nextLine();
String Answer = scan.next();
}
while (!Answer.equals("yes"));
您必须在循环范围外定义
应答
变量:
Scanner scan = new Scanner(System.in);
String answer;
do {
System.out.println("Do you want to watch a movie?");
// scan.nextLine(); you don't need this
answer = scan.next();
}
while (!answer.equals("yes"));
还应使用适当的Java命名约定:变量名称应为lowerCamelCase。测试条件超出了读取它的{and}的范围,因此将
字符串应答的声明(lowcase)移动到do语句之前,以便我们可以在块外测试它(while指令已失效,是再次执行该块的条件)
并且,nextLine()返回并使用读取的值,结果就是它
String answer;
do {
System.out.println("Do you want to watch a movie?");
answer = scan.nextLine();
} while(!answer.equals("yes"));