java - 在 String 之前将 int 数组转换为 char

Question

对于下面的函数

public static String symbolArrayToString(int[] symbols) { 

  String message = "";

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

        symbols[i] = message.codePointAt(i)-65;
        message = message + Integer.toString(symbols[i]);

        message.toUpperCase();

    }
    System.out.println(message);

    return message; 
}

在 int 数组变成 String 之前，如何将其转换为 chars？我不断收到此错误:

java.lang.StringIndexOutOfBoundsException: String index out of range: 0
    at java.lang.String.codePointAt(Unknown Source)
    at Caesar.symbolArrayToString(Caesar.java:50)
    at Caesar.main(Caesar.java:16)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at   edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand
      (JavacCompiler.java:272)

或者它只是返回字符串中数组的数字。

Answer 1

尝试更改 .codePointAt 行以处理数组本身。试试这个:

public static String symbolArrayToString(int[] symbols) { 

String message = "";

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

    symbols[i] = symbols[i] - 65;
    message = message + Integer.toString(symbols[i]);

    message.toUpperCase();

}
System.out.println(message);

return message; 

}