把一个字符串的首字母转成大写,其余为小写publicclassString5{publicstaticvoidmain(String[] args) {Stringstr="fsafwgFGRGawqgGWGsdawgQGH";Strings=str.substring(0,1).toUpperCase().concat(str.substring(1).toLowerCase());System.out.println(s); } } String类的其他功能 1.String的替换功能publicStrin...
public class Main { public static void main(String[] args) { // 创建Scanner对象 Scanner scanner = new Scanner(System.in); // 解析成绩字符串 System.out.println("请输入成绩字符串:"); String scoreString = scanner.nextLine(); // 使用正则表达式分割字符串 String[] scores = score...
*/ public class StringDemo { public static void main(String[] args) { //方式1 //String(String original):把字符串数据封装成字符串对象 String s1 = new String("hello"); System.out.println("s1:"+s1); System.out.println("---"); //方式2 //String(char[] value):把字符数组的数据封装...
public class MyTest2 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String next = sc.next(); String s = sc.nextLine(); System.out.println("next = " + next + ", s = " + s); /* 前面有空格,在next下不会录入 该nextLine了 next = 前面有空格,...
public class Main { public static void main(Stri // 创建一个 Scanner 对象,用于从标准输入读取数据 Scanner scanner = new Scanner(System.in); // 提示用户输入一个字符串 System.out.print("请输入一个字符串: "); // 使用 nextLine() 方法读取用户输入的一行字符串 ...
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入数组的长度:"); int length = scanner.nextInt(); int[] array = new int[length]; System.out.println("请输入数组的元素:"); for ...
public class EmailValidationExample { public static void main(String[m.xz.gzghjj.com] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入您的电子邮件地址: "); String email = scanner.nextLine(); // 正则表达式用于验证电子邮件地址 ...
public class MyScanner4 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("输入字符串数组:"); String str; str = sc.nextLine(); char[] ch = new char[str.length()]; for(int i=0; i<str.length(); i++) { ...
publicclassMain { publicstaticvoidmain(String args[]) { String cost ="话费清单:市话费66.66元,长途话费166.66元,短信费16.16元"; Scanner scanner =newScanner(cost); scanner.useDelimiter("[^0123456789.]+");//scanner设置分隔标记 doublesum=0; ...
importjava.util.Scanner;// Import the Scanner classclassMain{publicstaticvoidmain(String[]args){ScannermyObj=newScanner(System.in);// Create a Scanner objectSystem.out.println("Enter username");StringuserName=myObj.nextLine();// Read user inputSystem.out.println("Username is: "+userName);//...