Charset.isSupported() in Java

Charset.isSupported(): This method is available in java.nio.charset.Charset class of Java.

Syntax:

boolean java.nio.charset.Charset.isSupported(String charsetName)

This method takes one argument of type String as its parameter. This method tells whether the named charset is supported.

Parameters: One parameter is required for this method.

charsetName: The name of the requested charset; may be either a canonical name or an alias.

Returns: true if, and only if, support for the named charset is available in the current Java virtual machine.

Throws:

1. IllegalCharsetNameException - If the given charset name is illegal.

2. IllegalArgumentException - If the given charsetName is null.

For Example:

String charsetName = "UTF-8"

Charset.isSupported(charsetName) = > It returns true.

Approach 1: When no exceptions.

Java

import java.nio.charset.Charset;

public class CharsetisSupported {
    public static void main(String[] args) {

        String charsetName = "UTF-8";
        System.out.println(Charset.isSupported(charsetName));
    }
}

Output:

true

Approach 2: IllegalCharsetNameException

Java

import java.nio.charset.Charset;

public class CharsetisSupported {
    public static void main(String[] args) {

        String charsetName = "";
        System.out.println(Charset.isSupported(charsetName));
    }
}

Output:

Exception in thread "main" java.nio.charset.IllegalCharsetNameException: 
	at java.base/java.nio.charset.Charset.checkName(Charset.java:293)
	at java.base/java.nio.charset.Charset.lookup2(Charset.java:479)
	at java.base/java.nio.charset.Charset.lookup(Charset.java:459)
	at java.base/java.nio.charset.Charset.isSupported(Charset.java:500)
	

Approach 3:  IllegalArgumentException

Java

import java.nio.charset.Charset;

public class CharsetisSupported {
    public static void main(String[] args) {

        String charsetName = null;
        System.out.println(Charset.isSupported(charsetName));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: Null charset name
	at java.base/java.nio.charset.Charset.lookup(Charset.java:452)
	at java.base/java.nio.charset.Charset.isSupported(Charset.java:500)