第六章第三十八题（生成随机字符）(Generate random characters)

• *6.38（生成随机字符）使用程序清单6-10RandomCharacter中的方法，打印100个大写字母及100个一位数字，每行打印10个。
  *6.38(Generate random characters) Use the methods in RandomCharacter in Listing 6.10 to print 100 uppercase letters and then 100 single digits, printing ten per line.
• 参考代码：

package chapter06;

public class Code_38 {
    public static void main(String[] args) {
        for (int i = 1; i <= 200; i++) {
            if (i <= 100)
                System.out.print(RandomCharacter.getRandomUpperCaseLetter());
            else
                System.out.print(RandomCharacter.getRandomDigitCharacter());
            if (i % 10 == 0)
                System.out.print("n");
        }
    }
}
class RandomCharacter {
    public static char getRandomCharacter(char ch1, char ch2) {
        return (char) (ch1 + Math.random() * (ch2 - ch1 + 1));
    }
    public static char getRandomLowerCaseLetter() {
        return getRandomCharacter('a', 'z');
    }
    public static char getRandomUpperCaseLetter() {
        return getRandomCharacter('A', 'Z');
    }
    public static char getRandomDigitCharacter() {
        return getRandomCharacter('0', '9');
    }
    public static char getRandomCharacter() {
        return getRandomCharacter('u0000', 'uFFFF');
    }
}

• 结果显示：

FJOYKOMEHM
HKYEGHIUML
MKFQTUOHRP
RWVODHQXUI
EMPVKMBSIH
UQSKXLXQHF
RIZGMWIRYO
NKQIMITGMP
CSFEPWRRZZ
EZDFGHEQUX
7805935339
0190371742
0583184795
6189380079
0458389391
8499297748
5786171408
5156655037
3500072102
7427853825

Process finished with exit code 0

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