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' ) ;
}
}
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