java输出格式化与输入

/*
		 * 快捷键alt+shift+r批量更改单词
		 * %n  \n  换行
		 * 格式化输出
		 * %d	格式化输出整数,十进制
		 * %x	格式化输出十六进制整数
		 * %o   格式化输出八进制整数
		 * %f	格式化输出浮点数
		 * %e	格式化输出科学计数法表示的浮点数
		 * %s	格式化字符串    %S  格式化字符串大写
		 * %t   后面加Y是完整的年份，y后两位年份；m数字月份，B汉字型月份；d日期
		 */
		System.out.printf("%.2f\n",-20.16545);//-20.17
		System.out.printf("%.4f\n", 12.12345);//12.1235
		System.out.printf("%s = %s%n", "Name", "Zhangsan");	//Name = Zhangsan
		System.out.printf("%S = %s%n", "Name", "Zhangsan");//NAME = Zhangsan
		System.out.printf("%1$s = %3$s %2$s%n", "Name", "san", "Zhang");//1$指向对于第一个参数"Name" Name = Zhang san
		System.out.printf("%d; %d; %d%n", -500, 2343L, 342);//-500; 2343; 342
		System.out.printf("%x\n",32);//20
		System.out.printf("n=%d, hex=%08x%n", 12345, 12345);//八位用0补齐   n=12345, hex=00003039
		Date date = new Date();
		Long datal =date.getTime();
		System.out.println(date+"-------"+datal);//Thu Nov 28 17:14:57 CST 2019-------1574932497504
		System.out.printf("%1$tY-%1$tm-%1$td; %2$ty-%2$tm-%2$td%n", date, datal);//2019-11-28; 19-11-28
		System.out.printf("%1$tY-%1$tB-%1$td; %2$tY-%2$tb-%2$td%n", date, datal);//2019-十一月-28; 2019-十一月-28
		System.out.printf("%1$tD%n", date);//11/28/19
		System.out.printf("%1$tF%n", date);//2019-11-28
		
		/*
		 * 输入做switch判断
		 */
		Scanner sc = new Scanner(System.in);
		System.out.print("输入：");
		int age = sc.nextInt();
		System.out.printf("百分比:n=%.2f%%%n", (float)age/80*100);
		switch (age) {
		case 1:
			System.out.println("跳转到case1");
			break;
			
		case 2:
			System.out.println("跳转到case2");
			break;

		default:
			System.out.println("默认跳转");
			break;
		}