Java中的 Charset isSupported() 方法及示例
isSupported()方法是Java.nio.charset的内置方法,用于检查是否支持给定的字符集。
语法:
public final boolean isSupported()
参数:该函数接受一个强制参数字符集名称,它指定要检查的规范名称或别名。
返回值:函数返回一个布尔值。如果支持,则返回 true,否则返回 false。
错误和异常:该函数抛出两个异常,如下所示:
- IllegalCharsetNameException :如果给定的字符集名称是非法的,则抛出它
- IllegalArgumentException :如果给定的字符集名称为空,则抛出该异常
下面是上述函数的实现:
方案一:
Java
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
public class GFG {
public static void main(String[] args)
{
try {
System.out.println("ISO-2022-CN"
+ " is supported or not? :"
+ Charset.isSupported("ISO-2022-CN"));
}
catch (Exception e) {
System.out.println("Exception: "
+ e);
}
}
}
Java
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
public class GFG {
public static void main(String[] args)
{
try {
System.out.println("ISO is "
+ "supported or not? :"
+ Charset.isSupported("ISO"));
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
Java
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
public class GFG {
public static void main(String[] args)
{
try {
System.out.println("NULL is "
+ "supported or not? :"
+ Charset.isSupported(""));
}
catch (Exception e) {
System.out.println("Exception: "
+ e);
}
}
}
输出:
ISO-2022-CN is supported or not? :true
方案二:
Java
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
public class GFG {
public static void main(String[] args)
{
try {
System.out.println("ISO is "
+ "supported or not? :"
+ Charset.isSupported("ISO"));
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
}
输出:
ISO is supported or not? :false
方案 3:
Java
// Java program to demonstrate
// the above function
import java.nio.charset.Charset;
public class GFG {
public static void main(String[] args)
{
try {
System.out.println("NULL is "
+ "supported or not? :"
+ Charset.isSupported(""));
}
catch (Exception e) {
System.out.println("Exception: "
+ e);
}
}
}
输出:
Exception is java.nio.charset.IllegalCharsetNameException:
参考: https://docs.oracle.com/javase/9/docs/api/ Java/nio/charset/Charset.html#isSupported-java.lang.String-