java例程练习（统计字母数字等字符的个数）

public class Test { public static void main(String[] args) { //String s = "48WERSFas!@#"; String s = "23479odurqjPOWUER00*)*&)(#084234-9LRWEJRLJ5R2)*q#)*puFOURoupPU_(*"; int countNum = 0; int countUpperCase = 0; int countLowerCase = 0; int countOther = 0; char[] sc = new char[s.length()]; for(int i = 0; i < s.length(); i++) { sc[i] = s.charAt(i); if(sc[i] >= 65 && sc[i] <= 90) { countUpperCase ++; } else if(sc[i] >= 87 && sc[i] <= 122) { countLowerCase ++; } else if(sc[i] >= 48 && sc[i] <= 57){ countNum ++; } else { countOther ++; } } System.out.println(countNum); System.out.println(countUpperCase); System.out.println(countLowerCase); System.out.println(countOther); } } //还有一种方法<pre name="code" class="java">public class Test { public static void main(String[] args) { String s = "48WERSFas!@#"; //String s = "23479odurqjPOWUER00*)*&)(#084234-9LRWEJRLJ5R2)*q#)*puFOURoupPU_(*"; int countNum = 0; int countUpperCase = 0; int countLowerCase = 0; int countOther = 0; for(int i = 0; i < s.length(); i++) { char c = s.charAt(i); if(c >= 'A' && c <= 'Z') { countUpperCase ++; } else if(c >= 'a' && c <= 'z') { countLowerCase ++; } else if(c >= '0' && c <= '9'){ countNum ++; } else { countOther ++; } } System.out.println(countNum); System.out.println(countUpperCase); System.out.println(countLowerCase); System.out.println(countOther); } }