英文:
Im having a lot of trouble with randoms in Java and was wondering if someone could help? I am quite new to coding
问题
将一个随机字符转换为大写，将一个随机字符替换为随机数字，在密码中间添加波浪符~。以下是我在作业中已经完成的部分。
import java.util.Scanner;public class Main {public static void main(String[] args) {String pw;int pwl;Scanner scan = new Scanner(System.in);System.out.println("Enter your word passcode:");pw = scan.next();pw = (pw.toLowerCase());int length = pw.length();String firstChar = pw.substring(0, 1);String lastChar = pw.substring(length - 1);pw = lastChar + pw.substring(1, length - 1) + firstChar;System.out.println(pw);math.random();}}
英文:
Convert a random character to an upper case,Replace a random character with a random digit,Add a tilde ~ character to the middle of the passcode. Here is what I have got so far in my assignment.
import java.util.Scanner;public class Main{public static void main(String[] args){String pw;int pwl;Scanner scan = new Scanner(System.in);System.out.println("Enter your word passcode:");pw = scan.next();pw = (pw.toLowerCase());int length = pw.length();String firstChar = pw.substring(0, 1);String lastChar = pw.substring(length - 1);pw = lastChar + pw.substring(1, length-1) + firstChar;System.out.println(pw);math.random();}}
答案1
得分: 2
// 将随机字符转换为大写int random = (int) (Math.random() * pw.length());pw = pw.substring(0, random) + Character.toUpperCase(pw.charAt(random)) + pw.substring(random + 1);System.out.println(pw);// 将随机字符替换为随机数字random = (int) (Math.random() * pw.length());pw = pw.substring(0, random) + (int) (Math.random() * 10) + pw.substring(random + 1);System.out.println(pw);// 在密码的中间添加波浪符 ~ 字符int len = pw.length();pw = pw.substring(0, len / 2) + '~' + pw.substring(len / 2);System.out.println(pw);
英文:
// Convert a random character to an upper caseint random = (int) (Math.random() * pw.length());pw = pw.substring(0, random) + Character.toUpperCase(pw.charAt(random)) + pw.substring(random + 1);System.out.println(pw);// Replace a random character with a random digitrandom = (int) (Math.random() * pw.length());pw = pw.substring(0, random) + (int) (Math.random() * 10) + pw.substring(random + 1);System.out.println(pw);// Add a tilde ~ character to the middle of the passcode.int len = pw.length();pw = pw.substring(0, len / 2) + '~' + pw.substring(len / 2);System.out.println(pw);
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