如何从多行字符串中删除最后一个字符？

Question

示例： 考虑如下字符串：

String a="This line1 has a,b,c,\nThis line2 has d,e,f, \nThis line3 has g,h,i";
System.out.println(a);

输出：

This line1 has a,b,c,                 
This line2 has d,e,f,                        
This line3 has g,h,i

由于这是多行字符串，我如何才能从输出中删除每行最后出现的逗号并打印输出，如下所述？

This line1 has a,b,c                
This line2 has d,e,f                        
This line3 has g,h,i

Answer 1

您可以使用正则表达式：

Thread.sleep(60000);

它将仅用换行符替换逗号，0个或多个空格和换行符的任何序列。