java问题记录

/       System.out.println("请输入一个字母");
//       Scanner sc = new Scanner(System.in);
//       String str = sc.next();//获取得到到字符串
//       String s=str.toLowerCase();//字符串转换为小写
//       char c = s.charAt(0);
//       System.out.println(c);
    	
    	
    	@SuppressWarnings("resource")
		Scanner in = new Scanner(System.in);
    	System.out.print("请输入字母：");
    	char c = in.next().charAt(0);
    	if (c >= ‘A‘ && c <= ‘Z‘) {
    	c += 32;
    	System.out.println("这里的大写" + (char) (c - 32) + "被转换成了" + c);
    	System.out.println("这里的大写" + (c - 32) + "被转换成了" + c);
    	} else if (c >= ‘a‘ && c <= ‘z‘) {
    	c -= 32;
    	System.out.println("这里的小写" + (char) (c + 32) + "被转换成了" + c);
    	System.out.println("这里的小写" + (c + 32) + "被转换成了" + c);

    	}