【判断字符串】【OO面向对象】Java判断字符串中的大写字母，小写字母，其它字母。

来源：互联网发布：轰趴知乎编辑：程序博客网时间：2024/04/30 11:09

面向对象的方法，就是在main中只要说明我想干什么，然后把相关的参数扔给相关的方法，返回来的结果就是想要的。而不必在main或者在用户层面，需要如何操作。

package chapter3;public class judgeString {public static void main(String[] args) {String myString = "aAAString_*&^%$#@!";myString = JudgeWay.judge(myString);System.out.println(myString);}}class JudgeWay {public static String judge(String str) {char[] chr = null;chr = new char[str.length()];chr = str.toCharArray();int upperNum = 0;int lowerNum = 0;int nonEngNum = 0;for (int i = 0; i < chr.length; i++) {if (isUpper(chr[i])) {upperNum++;continue;} else if (isLower(chr[i])) {lowerNum++;continue;} else if (isNonEng(chr[i])) {nonEngNum++;}}return "大写：" + upperNum + " 小写：" + lowerNum + " 其它：" + nonEngNum;}public static boolean isUpper(char car) {if (car >= 65 && car < 'Z')// car >= 65 或者chr > 'A'return true;return false;}public static boolean isLower(char car) {if (car >= 'a' && car <= 'z')return true;return false;}public static boolean isNonEng(char car) {if (!((car >= 65 && car < 'Z')) && !(car >= 'a' && car <= 'z'))return true;return false;}}

运行结果：

大写：3 小写：6 其它：9

其实当然 Java里面，已经有非常好的机制和方法，如下：

package chapter3;public class judgeString {public static void main(String[] args) {String myString = "aAAString_*&^%$#@!";myString = JudgeWay.judge(myString);System.out.println(myString);}}class JudgeWay {//public static String judge(String str) {//char[] chr = null;//chr = new char[str.length()];//chr = str.toCharArray();//int upperNum = 0;//int lowerNum = 0;//int nonEngNum = 0;//for (int i = 0; i < chr.length; i++) {//if (isUpper(chr[i])) {//upperNum++;//continue;//} else if (isLower(chr[i])) {//lowerNum++;//continue;////} else if (isNonEng(chr[i])) {//nonEngNum++;//}//}////return "大写：" + upperNum + " 小写：" + lowerNum + " 其它：" + nonEngNum;//}////public static boolean isUpper(char car) {//if (car >= 65 && car < 'Z')// car >= 65 或者chr > 'A'//return true;//return false;////}////public static boolean isLower(char car) {//if (car >= 'a' && car <= 'z')//return true;//return false;////}////public static boolean isNonEng(char car) {//if (!((car >= 65 && car < 'Z')) && !(car >= 'a' && car <= 'z'))//return true;////return false;////}public static String judge(String word) {int upperNum = 0;int lowerNum = 0;int nonEngNum = 0;for (int i = 0; i < word.length(); i++) {char c = word.charAt(i);if (Character.isUpperCase(c)) {upperNum++;continue;} else if (Character.isLowerCase(c)) {lowerNum++;continue;} else if (!(Character.isLowerCase(c) || (Character.isUpperCase(c)))) {nonEngNum++;}}return "大写：" + upperNum + " 小写：" + lowerNum + " 其它：" + nonEngNum;}@Overridepublic String toString() {// TODO Auto-generated method stubreturn super.toString();}}

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