A.

Stringliteral is a sequence of characters used by Java programmers to populate String "I live at 22b Baker Street!" is a String Although in your Java code you will be writing the text within the quotes, the Java compiler will interpret the characters as Unicode code points. Unicode is a standard that assigns all letters, numbers, and symbols a unique numerical code. This means that every computer will display the same character for each numerical code. This means that if you know the number values you can actually write String "\u0049\u0020\u006C\u0069\u0076\u0065\u0020\u0061\u0074\u0020\u0032\u0032\u0042\u0020\u0042\u0061\u006B\u0065\u0072\u0020\u0053\u0074\u0072\u0065\u0065\u0074\u0021" represents the same String Unicode and normal text characters can also be mixed. This is useful for characters you might not know how to type. For example, a character with an umlaut (e.g., Ä, Ö) as in "Thomas Müller plays for Germany." would be: "Thomas M\u00FCller plays for Germany." To assign a String object a value just use a String String text = "So does Dr Watson";

Escape Sequences

There are certain characters that you might want to include into a String literal which need to be identified to the compiler. Otherwise, it might get confused and not know what the String value is supposed to be. For example, imagine you want to put a quotation mark within a String "So my friend said, "It's how big?"" This would confuse the compiler because it expects all String \" So the String "So my friend said, \"It's how big?\"" Now the compiler will come to the backslash and know the quotation mark is part of the String literal instead of its end point. If you're thinking ahead you're probably wondering but what if I want to have a backslash in my String \\ Some of the escape sequences available don't actually print a character to the screen. There are times when you might want to display some text split by a newline. For example: The first line. The second line. This can be done by using the escape sequence for the newline character: "The first line.\nThe second line." It's a useful way to put a little bit of formatting into one Sting There are several useful escape sequences worth knowing:

• \用于在文本中插入制表符
• \宾塞特退格
• \插入新行
• \洗车返回
• \'插入单个引号
• \“插入双引号
• \\插入反斜杠

示例Java代码可以在有趣的字符串示例代码中找到。