格式字符串错误的参数太多

重新格式化:

String formatString = String.format("
%-35s
%-10d
%.1f\n
%-35s
%-10d.1f\n
%-35s
%-10d
%.1f",
module1Name,
module1Students,
module1Mark,
module2Name,
module2Students,
module2Mark,
module3Name,
module3Students,
module3Mark);

你忘了一个'%'字符,不应该是:

String formatString = String.format("
%-35s
%-10d
%.1f\n
%-35s
%-10d
%.1f\n
%-35s
%-10d
%.1f",
module1Name,
module1Students,
module1Mark,
module2Name,
module2Students,
module2Mark,
module3Name,
module3Students,
module3Mark);