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
