不一致的StringBuilder在一個循環

Question

追加我有在循環中使用下面的StringBuilder作爲輸出不一致的問題。請幫忙！！！

String oldStr = "job1.job2.job3"; 
String[] newStr = oldStr.split(Pattern.quote(".")); 
StringBuilder result = new StringBuilder(); 
for (String temp : newStr) {  
    String key = "This is "+keyStr+" ,"; 
    result.append(key); 
    System.out.println(key.toString()); 
} 

我希望結果是

This is job1. 
This is job1. This is job2. 
This is job1. This is job2. This is job3. 

我沒有看到預期的結果，在一個點，但隨後我看到這些現在：

This is job1. 
This is job2. 
This is job3. 

如果我繼續運行代碼，我看到了多個元素：

This is job1. 
This is job2. 
This is job3. 
This is job1. 
This is job2. 
This is job3. 

是否有問題，我的代碼或StringBuilder的是不是因爲它應該正常運作？ TIA。

Answer 1

改變這一行

System.out.println(key.toString()); 

到

System.out.println(result.toString());