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Java字符串比较

我正在尝试实现一个简单的cesar密码.我在使用基于新键[]编码字符串的函数时遇到问题.我在这里展示了如何设置我的密钥.

private String[] alphabet =  {"a", "b", "c","d", "e", "f","g", "h", "i","j", "k", "l","m", "n", "o",
            "p", "q", "r","s", "t", "u","v", "w", "x","u", "z"};

public String[] CoderNewKey(int shift) {
    _NewKey = null;
    _NewKey = new String[25];

    for (int i = 0; i < 25; i++) {
        _NewKey[i] = alphabet[(i + shift) % 25];
    }
    return _NewKey;
}
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我遇到的问题是Coder,if语句都不是真的,而rtnstring总是只是"".

public String Coder(String[] key, String msg){
    String rtnstring = "";

    for ( int i = 0; i < msg.length();i++){

        for (int x …
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java arrays string

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