值得思考的基础

		// 1
		String classPath = "java.lang.String";
		System.out.println("--->" + classPath.replaceAll("\\.", "/"));
		// 2
		StringBuffer buf = new StringBuffer();
		switch (1) {
		case 1:
			buf.append("Hello a");
		case 2:
			buf.append("b");
		case 3:
			buf.append("c");
		default:
			buf.append("d");
		}
		System.out.println(buf.toString());
		// 3
		int j = 0;
		for (int i = 0; i < 100; i++) {
			j = j++;
		}
		System.out.println(j);
		// 4
		try {
			System.out.println("Hello world");
			System.exit(0);
		} finally {
			System.out.println("Goodbye world");
		}
		// 5
		Calendar cal = Calendar.getInstance();
		cal.set(2010, 07, 03); // Year, Month, Day
		System.out.print(cal.get(Calendar.YEAR) + " ");
		Date d = cal.getTime();
		System.out.println("---->" + d.getDay());