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可变字符串的插入删除和替换

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// 2.22 字符串插入、删除、替换
		// 插入
		StringBuffer str = new StringBuffer("Today is a good day!");
		str.insert(11," very ");
		System.out.println(str);// Today is a very good day!
		//删除和替换
		StringBuffer str1 = new StringBuffer("Today is a good day!");
		StringBuffer str2 = new StringBuffer("Today is a good day!");
		StringBuffer str3 = new StringBuffer("Today is a good day!");
		System.out.println(str1.delete(0, 5));// is a good day!
		System.out.println(str2.delete(0, 5));// is a good day!
		System.out.println(str3.replace(0,5,"Tomorrow "));//Tomorrow  is a good day!