Java 中的 Charset forName()方法，带示例
原文:https://www . geeksforgeeks . org/charset-for name-method-in-Java-with-examples/
forName() 方法是 java.nio.charset 的内置方法，为命名的 charset 返回一个 charset 对象。在这个函数中，我们传递一个规范名称或别名，并返回其各自的字符集名称。
语法 :
public static Charset forName?(String charsetName)
参数:该函数接受单个强制参数字符集名称，该参数指定要返回对象名称的规范名称或别名。
返回值:该函数为命名字符集返回一个字符集对象。
错误和异常:函数抛出三个异常如下所示:
- [illegalcharsetnameexception] : Thrown if the given character set name is illegal.
- [illegalargumentexception] : Thrown if the given character set name is empty.
- If not, throw : If the named character set is not supported in this instance of Java virtual machine.
下面是上述功能的实现:
程序 1:
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
public class GFG {
public static void main(String[] args)
{
// Gets the charset
Charset first = Charset.forName("ISO-2022-CN");
// Prints the object
System.out.println("The name for ISO-2022-CN is " + first);
}
}
输出:
The name for ISO-2022-CN is ISO-2022-CN
程序二:
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
public class GFG {
public static void main(String[] args)
{
// Gets the charset
Charset first = Charset.forName("UTF16");
// Prints the object
System.out.println("The name for UTF16 is " + first);
}
}
输出:
The name for UTF16 is UTF-16
程序 3
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
public class GFG {
public static void main(String[] args)
{
try {
// Gets the charset
Charset first = Charset.forName("");
// Prints the object
System.out.println("The name for null is " + first);
}
catch (Exception e) {
// Prints the exception
System.out.println("The exception is: " + e);
}
}
}
输出:
The exception is: java.nio.charset.IllegalCharsetNameException:
程序 4
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
public class GFG {
public static void main(String[] args)
{
try {
// Gets the charset
Charset first = Charset.forName("gopal");
// Prints the object
System.out.println("The name for gopal is " + first);
}
catch (Exception e) {
// Prints the exception
System.out.println("The exception is: " + e);
}
}
}
输出:
The exception is: java.nio.charset.UnsupportedCharsetException: gopal
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