Java Socket setTrafficClass() method

Last Updated : 17 Mar 2025

The setTrafficClass() method of Java Socket class sets the traffic class or type-of-service in the IP header for packets sent from the specified socket. The parameter (tc) should be in the range from 0 to 255(0<=tc<=255) else an IllegalArgumentException will be thrown.

Syntax

Parameter

The parameter 'tc' represents an integer value for the bitset.

Return

Throws

SocketException - if an error is there in the setting of the traffic class or type-of-service.

Example 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTrafficClassExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //integer value for the bitset.
        //tc should be in the range from 0 to 255(0<=tc<=255) else an IllegalArgumentException will be thrown
        int tc=98;
        //setTrafficClass() sets the traffic class or type-of-service in the IP header for packets sent from the specified socket
        socket.setTrafficClass(tc);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        System.out.println("Traffic class: "+socket.getTrafficClass());
    }
}

Output:

Traffic class: 98

Example 2

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTraffiClassExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //integer value for the bitset.
        //tc should be in the range from 0 to 255(0<=tc<=255) else an IllegalArgumentException will be thrown
        int tc=-98;
        //setTrafficClass() sets the traffic class or type-of-service in the IP header for packets sent from the specified socket
        socket.setTrafficClass(tc);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        System.out.println("Traffic class: "+socket.getTrafficClass());
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: tc is not in range 0 -- 255
	at java.net.Socket.setTrafficClass(Socket.java:1377)
	at com.tpointtech.JavaSocketSetTrafficClassExample2.main(JavaSocketSetTrafficClassExample2.java:13)

Example 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSetTrafficClassExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //closing the socket
        socket.close();
        //integer value for the bitset.
        int tc=98;
        //setTrafficClass() sets the traffic class or type-of-service in the IP header for packets sent from the specified socket
        //it will throw an error, as the socket is already closed
        socket.setTrafficClass(tc);
        //getTcpNoDelay() returns the setting for SO_TIMEOUT option
        System.out.println("Traffic class: "+socket.getTrafficClass());
    }
}

Output:

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.setTrafficClass(Socket.java:1380)
	at com.tpointtech.JavaSocketSetTrafficClassExample3.main(JavaSocketSetTrafficClassExample3.java:15)

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Java Socket setTrafficClass() method

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Example 3

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Java Socket setTrafficClass() method

Syntax

Parameter

Return

Throws

Example 1

Example 2

Example 3

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