Scanner scanner = new Scanner(System.in);System.out.println("上次考试成绩：");int num1 = scanner.nextInt();System.out.println("本次考试成绩：");int num2 = scanner.nextInt();double number = ((double) num2 /num1-1)*100;DecimalFormat df = new DecimalFormat("#.##"); // 保留两位小数String formattedNumber = df.format(number);System.out.println("成绩提高的百分比：" + formattedNumber+"%");