用java找出字符串中的数字和字母 用java编程统计用户从键盘输入的字符串中所包含的字母,数字...
java\u4e2d\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u542b\u6709\u5b57\u6bcd\u6216\u6570\u5b57\u63cf\u8ff0\uff1a
java.lang.character.isLetter(); \u65ad\u5b9a\u6307\u5b9a\u5b57\u7b26\u662f\u5426\u662f\u4e00\u4e2a\u5b57\u6bcd\u3002
java.lang.character.isDigit(); \u786e\u5b9a\u6216\u5224\u65ad\u6307\u5b9a\u5b57\u7b26\u662f\u5426\u662f\u4e00\u4e2a\u6570\u5b57\u3002
\u793a\u4f8b\uff1a
public static void main(String[] args){
boolean isDigit = false;//\u5b9a\u4e49\u4e00\u4e2aboolean\u503c\uff0c\u7528\u6765\u8868\u793a\u662f\u5426\u5305\u542b\u6570\u5b57
boolean isLetter = false;//\u5b9a\u4e49\u4e00\u4e2aboolean\u503c\uff0c\u7528\u6765\u8868\u793a\u662f\u5426\u5305\u542b\u5b57\u6bcd
String str = "aaasss8fff"; //\u5047\u8bbe\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32
for(int i=0 ; i<str.length() p="" \u5faa\u73af\u904d\u5386\u5b57\u7b26\u4e32
if(Character.isDigit(str.charAt(i))){ //\u7528char\u5305\u88c5\u7c7b\u4e2d\u7684\u5224\u65ad\u6570\u5b57\u7684\u65b9\u6cd5\u5224\u65ad\u6bcf\u4e00\u4e2a\u5b57\u7b26
isDigit = true;
}
if(Character.isLetter(str.charAt(i))){ //\u7528char\u5305\u88c5\u7c7b\u4e2d\u7684\u5224\u65ad\u5b57\u6bcd\u7684\u65b9\u6cd5\u5224\u65ad\u6bcf\u4e00\u4e2a\u5b57\u7b26
isLetter = true;
}
}
/*\u5faa\u73af\u5b8c\u6bd5\u4ee5\u540e
*\u5982\u679cisDigit\u4e3atrue\uff0c\u5219\u4ee3\u8868\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u6570\u5b57\uff0c\u5426\u5219\u4e0d\u5305\u542b
*\u5982\u679cisLetter\u4e3atrue\uff0c\u5219\u4ee3\u8868\u5b57\u7b26\u4e32\u4e2d\u5305\u542b\u5b57\u6bcd\uff0c\u5426\u5219\u4e0d\u5305\u542b
*/
System.out.println(isDigit);
System.out.println(isLetter);
}
import java.util.Scanner;public class Test { public static void main(String [] args){ Scanner input = new Scanner(System.in); System.out.print("\u8f93\u5165\u5b57\u7b26\u4e32\uff1a"); String strs = input.next(); int number = 0; int chara = 0; int other = 0; char [] chs = strs.toCharArray(); for(char c : chs){ if(c >= '0' && c = 'a' && c = 'A' && c <= 'Z' ){ chara++; }else{ other++; } } System.out.println("\u6570\u5b57\u6709:" + number + "\u4e2a\uff0c\u5b57\u7b26\u6709" + chara + "\u4e2a\uff0c\u5176\u4ed6\u6709\uff1a" + other + "\u4e2a\u3002" ); }}
public static void main(String[] args){boolean isDigit = false;//定义一个boolean值，用来表示是否包含数字
boolean isLetter = false;//定义一个boolean值，用来表示是否包含字母
String str = "aaasss8fff"; //假设有一个字符串
for(int i=0 ; i<str.length() ; i++){ //循环遍历字符串
if(Character.isDigit(str.charAt(i))){ //用char包装类中的判断数字的方法判断每一个字符
isDigit = true;
}
if(Character.isLetter(str.charAt(i))){ //用char包装类中的判断字母的方法判断每一个字符
isLetter = true;
}
}
/*循环完毕以后
*如果isDigit为true，则代表字符串中包含数字，否则不包含
*如果isLetter为true，则代表字符串中包含字母，否则不包含
*/
System.out.println(isDigit);
System.out.println(isLetter);
}
用正则表达式匹配[a-zA-Z0-9]
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绛旓細boolean isDigit = false;//瀹氫箟涓涓猙oolean鍊硷紝鐢ㄦ潵琛ㄧず鏄惁鍖呭惈鏁板瓧 boolean isLetter = false;//瀹氫箟涓涓猙oolean鍊硷紝鐢ㄦ潵琛ㄧず鏄惁鍖呭惈瀛楁瘝 String str = "aaasss8fff"; //鍋囪鏈変竴涓瀛楃涓 for(int i=0 ; i<str.length() ; i++){ //寰幆閬嶅巻瀛楃涓 if(Character.isDigit(str.charAt(...
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