/**
	 * 比较字符串是否相等
	 * 
	 * @param str
	 */
	public static void testEqualsStr(String str) {
		// equals方法比较字符串的值想否相等
		System.out.println("str.equals(\"I am in Beijing\") = "
				+ str.equals("I am in Beijing"));
		// equalsIgnoreCase方法比较字符串的值时不去分大小写
		System.out.println("str.equalsIgnoreCase(\"I am in Beijing\") = "
				+ str.equalsIgnoreCase("I am in Beijing"));
		// startsWith方法判断字符串是否以某个子字符串开始
		System.out.println("str.startsWith(\"Th\") = " + str.startsWith("Th"));
		// endsWith方法判断字符串是否以某个子字符串结束
		System.out.println("str.endsWith(\"t!\") = " + str.endsWith("t!"));
	}