1. float f1 = 2.3F;
long l1 = 2344234L;
2,从键盘输入
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();

1. float f1 = 2.3F;
long l1 = 2344234L;
2,从键盘输入
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();