使用字符文字存储转义序列的 Java 程序
一个转义序列是一个字符或一个字符序列，其目的是实现那些他们不从字面上表示的字符，否则这些字符可能无法表示。这类字符的一些例子包括退格、 换行符、水平或垂直制表符，等等。在 java 中，这些序列由反斜杠“\”前面的表示，属于字符数据类型。Java 中共有 8 个转义序列。它们如下所示:
**Tab : '\t'**
**Newline : '\n'**
**Backspace : '\b'**
**Form feed : '\f'**
**Carriage return : '\r'**
**Backslash : '\\'**
**Single quote : '\''**
**Double quote : '\"'**
1。类型铸造: 类型铸造是将一个原始数据类型转换为另一个的概念。类型铸造有两种类型:
- Widening or automatic type casting : In this process, a primitive data type with lower priority will be automatically converted to another primitive data type with higher priority. For example, the conversion from int to double .
- Reduction or explicit type conversion : This is the process of converting the original data type with higher priority into the original data type with lower priority. For example, the conversion from int to char .
我们将在这里使用显式类型转换。更具体地说，从 int 到 char 的类型转换。
2。ASCII 码: ASCII 码用于用数字表示字符。这是一个统一的系统，允许计算机解释所有的字符。ASCII 代表美国信息交换标准代码。例如，字符的 ASCII 码为 97 。
有 2 种方法我们可以在 Java 中用字符文字存储转义序列。它们如下所示:
- By using explicit type conversion
将转义序列的 ASCII 码转换为字符文字，在单引号内使用正常转义序列
方法 1:
在这种方法中，我们使用最简单的方法，即直接将转义序列存储为字符文字。
CODE:
Java
// Java code to store escape sequences
// as character literals
class StoreCharacterLiterals {
// the method to print the escape
// sequences
static void escapeSequences()
{
// declaration of Character
// literals
char tab = '\t', backspace = '\b', newline = '\n',
formFeed = '\f', carriageReturn = '\r',
singleQuote = '\'', doubleQuote = '\"',
backSlash = '\\';
// printing the horizontal tab
System.out.println("This" + tab + " is an "
+ "implementation of tab");
// implementing the backspace
System.out.println("This" + backspace + " is an "
+ "implementation "
+ "of backspace");
// implementing the newline
System.out.println("This" + newline + " is an "
+ "implementation of newline");
// implementing the formfeed
System.out.println("This" + formFeed + " is an"
+ " implementation of "
+ "formfeed");
// implementing the carriage return
System.out.println("This" + carriageReturn
+ " is an implementation "
+ "of Carriage Return");
// printing the single quote
System.out.println("This" + singleQuote
+ " is an implementation"
+ " of single quote");
// printing the double quote
System.out.println("This" + doubleQuote
+ " is an implementation "
+ "of double quote");
// printing the backslash
System.out.println("This" + backSlash
+ " is an implementation "
+ " of backslash");
}
// Driver Code
public static void main(String[] args)
{
// creating an object of the class
StoreCharacterLiterals ob = new StoreCharacterLiterals();
// calling the escapeSequences() method
ob.escapeSequences();
}
}
输出
This is an implementation of tab
Thi is an implementation of backspace
This
is an implementation of newline
This
is an implementation of formfeed
is an implementation of Carriage Return
This' is an implementation of single quote
This" is an implementation of double quote
This\ is an implementation of backslash
方法 2:
按照这种方法，我们使用显式类型转换从 int 到 char 来存储字符文本中的转义序列。
Java
// Java code to store escape sequences
// as character literals
class StoreCharacterLiterals {
// the method to print the escape
// sequences
static void escapeSequences()
{
// declaration of Character
// literals using their ASCII codes
// ASCII code for tab : 9
// ASCII code for backspace : 8
// ASCII code for newline : 10
// ASCII code for formfeed : 12
// ASCII code for carriage return : 13
// ASCII code for single quote : 39
// ASCII code for double quote : 34
// ASCII code for backslash : 92
char tab = 9, backspace = 8, newline = 10,
formFeed = 12, carriageReturn = 13,
singleQuote = 39, doubleQuote = 34,
backSlash = 92;
// printing the horizontal tab
System.out.println("This" + tab + " is an "
+ "implementation of tab");
// implementing the backspace
System.out.println("This" + backspace + " is an "
+ "implementation "
+ "of backspace");
// implementing the newline
System.out.println("This" + newline + " is an "
+ "implementation of newline");
// implementing the formfeed
System.out.println("This" + formFeed + " is an"
+ " implementation of "
+ "formfeed");
// implementing the carriage return
System.out.println("This" + carriageReturn
+ " is an implementation "
+ "of Carriage Return");
// printing the single quote
System.out.println("This" + singleQuote
+ " is an implementation"
+ " of single quote");
// printing the double quote
System.out.println("This" + doubleQuote
+ " is an implementation "
+ "of double quote");
// printing the backslash
System.out.println("This" + backSlash
+ " is an implementation "
+ " of backslash");
}
// Driver Code
public static void main(String[] args)
{
// creating an object of the class
StoreCharacterLiterals ob = new StoreCharacterLiterals();
// calling the escapeSequences() method
ob.escapeSequences();
}
}
输出
This is an implementation of tab
Thi is an implementation of backspace
This
is an implementation of newline
This
is an implementation of formfeed
is an implementation of Carriage Return
This' is an implementation of single quote
This" is an implementation of double quote
This\ is an implementation of backslash
注意:在控制台(Windows)或终端(Ubuntu)运行代码。他在控制台上为 \b 编码输出。更多信息，请阅读:https://stackoverflow . com/questions/3328824/Java-退格-转义
版权属于：月萌API www.moonapi.com，转载请注明出处
