Java正则表达式验证固定电话号码符合性

/**
 * 验证固定电话号码的合法性
 * @author jy
 */
package phone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PhoneTest {
  public static boolean isPhone(String str) {
    Pattern p1 = null, p2 = null;
    Matcher m = null;
    boolean isPhone = false;
    p1 = Pattern.compile("^[0][1-9]{2,3}-[0-9]{5,10}$"); // 验证带区号的
    p2 = Pattern.compile("^[1-9]{1}[0-9]{5,8}$");     // 验证没有区号的
    if (str.length() > 9) {
     m = p1.matcher(str);
     isPhone = m.matches();
    } else {
      m = p2.matcher(str);
      isPhone = m.matches();
    }
    return isPhone;
  }
  
  public static void main(String[] args) {
 
   String phone = "0770-88889999";
   if(isPhone(phone)){
     System.out.println(phone+"是符合的电话号码");
   }else {
     System.out.println(phone+"不符合");
   }
  }
}

public boolean isNumeric(String str){ 
  Pattern pattern = Pattern.compile("[0-9]*"); 
  Matcher isNum = pattern.matcher(str);
  if( !isNum.matches() ){
    return false; 
  } 
  return true; 
}