public class PrintCapsOnly
1: //PrintCapsOnly.java
2: //Reads in up to a full line of characters and then writes
3: //out only those which are capitals, in the same order.
5: import java.io.IOException;
7: public class PrintCapsOnly
8: {
9: public static void main(String[] args) throws IOException
10: {
11: System.out.println
12: (
13: "\nThis program reads in up to a full line of "
14: + "characters and then writes out the\ncapitals only, in the "
15: + "same order they were entered.\n"
16: );
18: System.out.print("Enter the line of characters on the line below:\n");
19: readCharsAndPrintCapsOnly();
20: System.out.println();
21: }
23: /** Read a line of characters and print out only those that are
24: capital letters, in the same order that they were entered.
25: <p>Pre:<p>The input stream is empty.
26: <p>Post:<p>A line of characers has been entered and the capital
27: letters in that line have been written out in their original order.
28: */
29: public static void readCharsAndPrintCapsOnly() throws IOException
30: {
31: char ch = (char)System.in.read();
32: if (ch != '\n')
33: {
34: if (ch >= 'A' && ch <= 'Z') System.out.print(ch);
35: readCharsAndPrintCapsOnly();
36: }
37: }
38: }