关于compareTo使用的几种情况

		String source = "A";
		String tager = "B";
		int i = source.compareTo(tager);
		System.out.println(i);    //输入为 -1
		 
		String source = "B";
		String tager = "B";
		int i = source.compareTo(tager);
		System.out.println(i);    //输出为 0

		String source = "c";
		String tager = "B";
		int i = source.compareTo(tager);
		System.out.println(i);    //输出为 33
		
		String source = "D";
		String tager = "B";
		int i = source.compareTo(tager);
		System.out.println(i);    //输出为 2
		
		String source = "3";
		String tager = "1";
		int i = source.compareTo(tager);
		System.out.println(i);    //输出为 2