什么是Java相当于javascript的String.fromCharCode？

Question

什么是Java相当于javascript的:

String.fromCharCode(n1, n2, ..., nX)

http://www.w3schools.com/jsref/jsref_fromCharCode.asp

Answer 1

那将是如下:

public static String fromCharCode(int... codePoints) {
    StringBuilder builder = new StringBuilder(codePoints.length);
    for (int codePoint : codePoints) {
        builder.append(Character.toChars(codePoint));
    }
    return builder.toString();
}

请注意,char无法保证转换为有效,因为代码点值可能超过char(65535)的上限.它char是在黑暗的Java时代建立的,当时Unicode 3.1还没有超过65535个字符.

更新:String实际上有一个构造函数采用int[](从Java 1.5开始引入,从头顶不知道它),它正确地处理了这个问题.以上内容可简化如下:

public static String fromCharCode(int... codePoints) {
    return new String(codePoints, 0, codePoints.length);
}