몇가지 유용한 코드입니다..
package myTest; public class Test { public static void main(String[] args) { String s = "This is my test string."; for (char c : s.toCharArray()) { System.out.print(c); } System.out.println(" "); for (char c : s.toCharArray()) { if ( c == ' ') continue; else System.out.print(c); } System.out.println(" "); for (char c : s.toCharArray()) { int ascii = (int)c; if ( ( ascii >= 65 && ascii <= 78 ) || ( ascii >= 97 && ascii <= 110 ) ) { System.out.print(c); } } System.out.println(" "); for (int i=0; i<s.length(); i++) { if ( i % 2 == 0 ) { System.out.print(s.charAt(i)); } } System.out.println(" "); } }