给定一个字符串，截取出所有的英文字母 ☆ String str = “Hello,java,c++,python,html,css,mysql”;
方法一
public class Demo {
public static void main(String[] args) {
String str = “Hello,java,c++,python,html,css,mysql”;
char[] arr = str.toCharArray();
String s="";
for (char n : arr) {
if(n>=‘A’&&n<=‘Z’||n>=‘a’&&n<=‘z’)
s+=n;
}
System.out.println(s);
}
}
方法二
public class Demo {
public static void main(String[] args) {
String str = “Hello,java,c++,python,html,css,mysql”;
String s="";
for (int i = 0; i < str.length(); i++) {
char arr = str.charAt(i);
if(arr>=‘A’&&arr<=‘Z’||arr>=‘a’&&arr<=‘z’)
s+=arr;
}
System.out.println(s);
}
}
