Java 做一个加密程序，我得到一个sytnax错误，但我不知道为什么

目前，我正在尝试制作一个基本程序，它接受任何字符串的输入，例如一个句子或一个段落，它接受每个字母，并将其转换为3个字符的代码一旦我开始工作，我假设我应该能够做相反的事，让它接受3位数的代码并将其转换回文本，无论如何，当我试图编译程序来测试它时，我得到了一个错误。我已将问题标记在下面。此外，一旦我得到的程序工作，我想为它做一个图形用户界面，你把输入，它显示输出后，你点击一个按钮，但由于我刚刚开始，这似乎是一个很好的，但对我来说，如果你知道任何好的教程，请让我知道

import java.util.Scanner;
import java.util.*;
class test {
private static Scanner inp;
public static void main(String[] args) {
    Map <Character, String> encryptionMappings = new HashMap<>();
    encryptionMappings.put('a',"{qaz}");
    encryptionMappings.put('b',"{wsx}");
    encryptionMappings.put('c',"{edc}");
    encryptionMappings.put('d',"{rfv}");
    encryptionMappings.put('e',"{tgb}");
    encryptionMappings.put('f',"{yhn}");
    encryptionMappings.put('g',"{ujm}");
    encryptionMappings.put('h',"{ik,}");
    encryptionMappings.put('i',"{ol>}");
    encryptionMappings.put('j',"{p;?}");
    encryptionMappings.put('k',"{[']}");
    encryptionMappings.put('l',"{qwe}");
    encryptionMappings.put('m',"{asd}");
    encryptionMappings.put('n',"{zxc}");
    encryptionMappings.put('o',"{rty}");
    encryptionMappings.put('p',"{fgh}");
    encryptionMappings.put('q',"{vbn}");
    encryptionMappings.put('r',"{yui}");
    encryptionMappings.put('s',"{hjk}");
    encryptionMappings.put('t',"{nm,}");
    encryptionMappings.put('u',"{iop}");
    encryptionMappings.put('v',"{qaw}");
    encryptionMappings.put('w',"{sxz}");
    encryptionMappings.put('x',"{red}");
    encryptionMappings.put('y',"{cvf}");
    encryptionMappings.put('z',"{ytg}");
    encryptionMappings.put('A',"{hnb}");
    encryptionMappings.put('B',"{iuj}");
    encryptionMappings.put('C',"{kml}");
    encryptionMappings.put('D',"{opl}");
    encryptionMappings.put('E',"{wom}");
    encryptionMappings.put('F',"{wsv}");
    encryptionMappings.put('G',"{ths}");
    encryptionMappings.put('H',"{imv}");
    encryptionMappings.put('I',"{ybf}");
    encryptionMappings.put('J',"{cja}");
    encryptionMappings.put('K',"{thw}");
    encryptionMappings.put('L',"{maz}");
    encryptionMappings.put('M',"{pqa}");
    encryptionMappings.put('N',"{zwl}");
    encryptionMappings.put('O',"{;ld}");
    encryptionMappings.put('P',"{'d;}");
    encryptionMappings.put('Q',"{;ny}");
    encryptionMappings.put('R',"{;ws}");
    encryptionMappings.put('S',"{c/.}");
    encryptionMappings.put('T',"{%@^}");
    encryptionMappings.put('U',"{/mc}");
    encryptionMappings.put('V',"{uka}");
    encryptionMappings.put('W',"{zby}");
    encryptionMappings.put('X',"{&hd}");
    encryptionMappings.put('Y',"{&hw}");
    encryptionMappings.put('Z',"{^#^}");
    encryptionMappings.put('0',"{$g%}");
    encryptionMappings.put('1',"{^@%}");
    encryptionMappings.put('2',"{142}");
    encryptionMappings.put('3',"{243}");
    encryptionMappings.put('4',"{089}");
    encryptionMappings.put('5',"{756}");
    encryptionMappings.put('6',"{423}");
    encryptionMappings.put('7',"{312}");
    encryptionMappings.put('8',"{145}");
    encryptionMappings.put('9',"{187}");
    encryptionMappings.put('~',"{)*(}");
    encryptionMappings.put('`',"{$#%}");
    encryptionMappings.put('!',"{!^#}");
    encryptionMappings.put('@',"{@^&}");
    encryptionMappings.put('#',"{^@&}");
    encryptionMappings.put('$',"{!?*}");
    encryptionMappings.put('%',"{^<+}");
    encryptionMappings.put('^',"{+$$}");
    encryptionMappings.put('&',"{!!*}");
    encryptionMappings.put('*',"{((%}");
    encryptionMappings.put('(',"{*&^}");
    encryptionMappings.put(')',"{$%^}");
    encryptionMappings.put('_',"{&#^}");
    encryptionMappings.put('-',"{<>?}");
    encryptionMappings.put('=',"{:'^}");
    encryptionMappings.put('{',"{%%G}");
    encryptionMappings.put('}',"{$$$}");
    encryptionMappings.put('[',"{***}");
    encryptionMappings.put(']',"{:::}");
    encryptionMappings.put(':',"{#$%}");
    encryptionMappings.put('|',"{?H*}");
    encryptionMappings.put(';',"{B&&}");
    encryptionMappings.put('"',"{@gs}");
    encryptionMappings.put('?',"{^gl}");
    encryptionMappings.put('/',"{@gn}");
    encryptionMappings.put('<',"{%TG}");
    encryptionMappings.put('>',"{5%5}");
    encryptionMappings.put(',',"{yty}");
    encryptionMappings.put('.',"{ggg}");

    inp = new Scanner(System.in);
    System.out.println("Input Password");
    int n = inp.nextInt();

    if(n!=234) {
        System.out.println("Denied Acess");
    } else { 
        System.out.print("Password Accepted"
                + "               ");
    System.out.print("Input Text to encrypt: ");

    String m = inp.next();
    String encryptMe = "He";
    StringBuilder builder = new StringBuilder();

---

您正试图对对象调用一个方法，但缺少需要遵循

toCharArray

的空

（）

。有些语言允许省略空括号，但Java不是其中之一。你应使用：

for (Character c : encryptMe.toCharArray()) {
  builder.append(encryptionMappings.get(c));
}

---

一个好的IDE（Eclipse、Intellij IDEA、Netbeans等）将帮助您在学习的过程中捕捉这些语法错误

我看到你开始了。但有一个提示：这是非常基本的东西。在Java对象中，只有字段或方法。这就是我昨天提到阅读所有javadoc的原因。然后您会注意到toCharArray必须是一个方法调用。。。因此需要括号。如果quora不明白，你应该先学习一些关于这些基础知识的教程。我刚刚在那个答案中修改了我的示例代码。顺便说一句，我不知道你在你给我的代码中把输出和输入变量分配给了什么。看起来liek“encryptme”是输入和“encrypt”是输出，但当我这样设置它时，它不工作，并且错误该方法在中定义，并且我刚刚验证了代码对我有效。我不知道你为什么会犯这个错误，除非上面还有一个错误。在Java中，始终尝试解决最早的编译问题，因为它可能会影响以下问题。我现在可以使用它了。感谢您的帮助，现在我只需要让它正确地输出代码

for (Character c : encryptMe.toCharArray()) {
  builder.append(encryptionMappings.get(c));
}