import java.util.Vector;public class Letters {
public static void main(String[] args) {
int x = 0;
Vector<Character> myLetters = new Vector<Character>();
int count = 0; for (int i = 0; i < 100; i++) {
x = (int) (Math.random() * 26);
char[] chs = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W', 'X', 'Y', 'Z' };
char myChar = chs[x];
myLetters.add(myChar);
System.out.print(myChar + " ");
}
System.out.println();
for (int i = 0; i < 100; i++) {
if (myLetters.elementAt(i) == ('A')
|| myLetters.elementAt(i) == ('E')
|| myLetters.elementAt(i) == ('I')
|| myLetters.elementAt(i) == ('O')
|| myLetters.elementAt(i) == ('U')) {
count++;
}
}
System.out.println("元音字母个数有:" + count);
}
}
public static void main(String[] args) {
int x = 0;
Vector<Character> myLetters = new Vector<Character>();
int count = 0; for (int i = 0; i < 100; i++) {
x = (int) (Math.random() * 26);
char[] chs = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W', 'X', 'Y', 'Z' };
char myChar = chs[x];
myLetters.add(myChar);
System.out.print(myChar + " ");
}
System.out.println();
for (int i = 0; i < 100; i++) {
if (myLetters.elementAt(i) == ('A')
|| myLetters.elementAt(i) == ('E')
|| myLetters.elementAt(i) == ('I')
|| myLetters.elementAt(i) == ('O')
|| myLetters.elementAt(i) == ('U')) {
count++;
}
}
System.out.println("元音字母个数有:" + count);
}
}
x 属于 (0,26)
public static double random()
Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0.
Math.random() 返回的是0~0.999999999999999999... 的其中一个值
所以返回结果就是0~25
返回 [0,26) 其中一个整数
Math.random() 随机[0,1)之间的数
乘26是得到 0到25之间的数 包含254楼正解