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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.text;

/**
 * ASCII字符对应的字符串缓存
 *
 * @author looly
 * @since 4.0.1
 *
 */
public class ASCIIStrCache {

	private static final int ASCII_LENGTH = 128;
	private static final String[] CACHE = new String[ASCII_LENGTH];
	static {
		for (char c = 0; c < ASCII_LENGTH; c++) {
			CACHE[c] = String.valueOf(c);
		}
	}

	/**
	 * 字符转为字符串

	 * 如果为ASCII字符，使用缓存
	 *
	 * @param c 字符
	 * @return 字符串
	 */
	public static String toString(char c) {
		return c < ASCII_LENGTH ? CACHE[c] : String.valueOf(c);
	}
}