的Java：一個列表字符串格式

Question

如何做一個格式如下：

從這：

1: My street 
2: 1232321 
3: Hello there world! 
4: A really really really long word! 

要這樣：

1:       My street 
2:        1232321 
3:     Hello there world! 
4: A really really really long word! 

我認爲這是與字符串.format（）和一堆隨機字符在裏面！

Answer 1

你可以先拆你的字符串得到1:和My Street分開，然後進行格式化： -

String str = "1: My street"; 
String str2 = "3: Hello there world!"; 

String[] arr = str.split("(?<=:) "); 
String[] arr2 = str2.split("(?<=:) "); 

System.out.printf("%s%30s\n", arr[0], arr[1]); 
System.out.printf("%s%30s", arr2[0], arr2[1]); 

輸出： -

1:      My street 
3:   Hello there world! 

你可以用String#substring方法做到這一點也，分別得到兩部分。

System.out.printf("%s%30s\n", str.substring(0, 2), str.substring(3));