字符串a1,b2,c3变a,b,c

public class HelloWorld{
public static void main(String []args){
System.out.println( test("a1,b2,c3"));


}
public static String test(String str){
String[] strs = str.split(",");
str = "";
for (int i = 0; i < strs.length; i++) {
int endIndex = strs[i].length() -1;
strs[i] = strs[i].substring(0, endIndex);
str += strs[i];
if( i !=strs.length -1){
str += ",";
}
}
return str;
}
}