java生成随机数字和字母组合

<span style="font-size:24px;">  import java.util.Random;

public String getCharAndNumr(int length) {
String val = "";
Random random = new Random();
for(int i = 0; i < length; i++) {
String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num"; // 输出字母还是数字
if("char".equalsIgnoreCase(charOrNum)) // 字符串 {
int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; //取得大写字母还是小写字母
val += (char) (choice + random.nextInt(26));
} else if("num".equalsIgnoreCase(charOrNum)){ </span><span style="font-size: 24px; font-family: Arial, Helvetica, sans-serif;">// 数字</span><span style="font-size:24px;">
val += String.valueOf(random.nextInt(10));
}
}
return val;
}</span>