public class HelloWorld {
??? public static void main(String[] args) {
??// 創(chuàng)建一個(gè)空的StringBuilder對(duì)象
??StringBuilder str=new StringBuilder();
???????
??// 追加字符串
??str.append("jaewkjldfxmopzdm");
??
??????? // 從后往前每隔三位插入逗號(hào)
??
??????? for (int i=str.length()-3;1>0;i=i-3){
?????????????? str.insert(i,',');
??}
??
??????? // 將StringBuilder對(duì)象轉(zhuǎn)換為String對(duì)象并輸出
??System.out.println(str.toString());
?}
}

HelloWorld.java:16: error: unreachable statement
??System.out.println(str.toString());
??^
1 error