//删除StringBuilder最后一个逗号
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("123,");
stringBuilder.deleteCharAt(stringBuilder.length()-1);
System.out.println(stringBuilder.toString());
//删除StringBuilder最后一个逗号
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("123,");
stringBuilder.deleteCharAt(stringBuilder.length()-1);
System.out.println(stringBuilder.toString());
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