public class Test{
public static void main(String []args){
String aa = "123";
boolean flag = isNum(aa );
}
public static boolean isNum(String aa){
Pattern pattern = Pattern.compile("[0-9]*");
Matcher matcher = pattern.matcher(aa);
if(!matcher.matchers()){
return false;
} else{
return true;
}
}
}
判断是否字符串是否含有数字或字母
public class Test {
public static void main(String[] args) {
String aString = "1";
Pattern pattern1 = Pattern.compile("[a-zA-Z]*");
Pattern pattern2 = Pattern.compile("[0-9]*");
Pattern pattern3 = Pattern.compile("[a-zA-Z0-9]*");
Matcher matcher1 = pattern1.matcher(aString);
Matcher matcher2 = pattern2.matcher(aString);
Matcher matcher3 = pattern3.matcher(aString);
if (matcher1.matches()) {
System.out.println("只含有字母");
} else if (matcher2.matches()) {
System.out.println("只含有數字");
} else if (matcher3.matches()) {
System.out.println("含有數字或字母");
}
}
}
public static void main(String[] args) {
String aString = "19 A aw我~";
char[]chars = aString.toCharArray();
for(int i=0;i<chars.length;i++){
if(chars[i]>=47 &&chars[i]<=57){
System.out.println("含有數字"+String.valueOf(chars[i]));
}else
if((chars[i]>=65 &&chars[i]<=97)||(chars[i]>=97 &&chars[i]<=122)){
System.out.println("含有字母"+String.valueOf(chars[i]));
}else
if((chars[i]==32)){
System.out.println("含有空格"+String.valueOf(chars[i]));
}else {
System.out.println("含有漢字"+String.valueOf(chars[i]));
}
}
