一级a做片性视频网站,辽宁天一建设有限责任公司网站,学做美食视频网站,网站开发失败原因分析从Java 1.5开始引入Scanner类。此类接受File#xff0c;InputStream#xff0c;Path和String对象#xff0c;使用正则表达式逐个令牌读取所有原始数据类型和String(从给定的源)令牌。默认情况下#xff0c;空格被视为定界符(将数据分成令牌)。使用Scanner类读取字符Scanner…从Java 1.5开始引入Scanner类。此类接受FileInputStreamPath和String对象使用正则表达式逐个令牌读取所有原始数据类型和String(从给定的源)令牌。默认情况下空格被视为定界符(将数据分成令牌)。使用Scanner类读取字符Scanner类提供nextXXX()(其中xxx是intfloatboolean等)方法这些方法用于读取各种原始数据类型。但是它从来没有提供读取单个字符的方法。但是您仍然可以使用此类读取单个字符。next()Scanner类的方法以String格式返回源的下一个标记。这会将单个字符(由定界符分隔)读取为字符串。String str sc.next();toCharArray()String类的方法将当前String转换为字符数组。char ch[] str.toCharArray()从数组中可以获取存储在第0个位置的字符。char myChar ch[0];示例以下示例使用Scanner类从用户读取单个字符。import java.util.Scanner;public class ContentsOfFile {public static void main(String args[]) throws Exception {//创建扫描仪对象Scanner sc new Scanner(System.in);//创建一个StringBuffer对象System.out.println(Enter your grade: (A, B, C, D));char grade sc.next().toCharArray()[0];if(grade A){System.out.println(You are very good, you have been promoted);}else if(gradeB){System.out.println(You are good, you have been promoted);}else if(gradeC){System.out.println(You are average, you have been promoted, you need to work hard);}else if(gradeD){System.out.println(You are not promoted, try again);}else {System.out.println(Improper input);}}}输出结果Enter your grade: (A, B, C, D)CYou are average, you have been promoted, you need to work hard
