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// Unicode中汉字所占区域\u4e00-\u9fa5,将4e00和9fa5转为10进制
int start = Integer.parseInt("4e00", 16);
int end = Integer.parseInt("9fa5", 16);
System.out.println(start);
System.out.println(end);
// 输出结果
// 19968
// 40869
// 随机数
Random random = new Random();
int code = random.nextInt(end - start + 1) + start;
// 转为字符
String str = new String(new char[] { (char) code });
System.out.println(str);
简化代码:
public static String getRandomChinese() {
return new String(new char[] { (char) (new Random().nextInt(20902) + 19968) });
}