@Test
public void test001() {
StringBuilder builder = new StringBuilder("手机号1,手机号2,手机号3,");
String result = builder.deleteCharAt(builder.length() - 1).toString();
System.out.println(result);
}
@Test
public void test001() {
StringBuilder builder = new StringBuilder("手机号1,手机号2,手机号3,");
String result = builder.deleteCharAt(builder.length() - 1).toString();
System.out.println(result);
}