Replace SNMP4J Vector<VariableBinding> with ArrayList<String> [duplicate]

Question

Can somebody show the correct syntax to replace a vector with an ArrayList?

Original code -

StringBuilder msg = new StringBuilder();
        msg.append(event.toString());
                Vector<? extends VariableBinding> varBinds = event.getPDU()
                .getVariableBindings();

Have tried -

List<String> variables = new ArrayList<>();
for (VariableBinding binding : event.getPDU().getVariableBindings()) {
    variables.add(String.valueOf(binding.getVariable()));
}

But multiple issues (diamond operator not supported, can convert ArrayList to String). Netbeans / JDK1.6

And tried -

ArrayList<String> list = new ArrayList<String>(varBinds) = event.getPDU().getVariableBindings();

But unexpected type, required variable found value, cannot find symbol variable varBinds.

Thoughts appreciated

Regards Active

This seems like a good opportunity to upgrade to a supported Java version. — Stefan
– Stefan, Commented Dec 7, 2017 at 9:12
Hello Shivam, tried your ArrayList (see my original post) but multiple issues, probably syntax on my part — Active
– Active, Commented Dec 7, 2017 at 9:27

Spangen · Accepted Answer · 2017-12-07 09:54:03Z

1

The diamond operator was not available in JDK 1.6. You need to define the ArrayList using the old style generics form:

import java.util.List;
import java.util.ArrayList;

List<String> variables = new ArrayList<String>();

Following the docs of SNMP4J at

http://www.snmp4j.org/doc/index.html

The event.getPDU().getVariableBindings() will return an Vector of VariableBindings

If you want to store that in an ArrayList of VariableBindings you could do

List<VariableBinding> variables = new ArrayList<String>(event.getPDU().getVariableBindings());

However if you are looking to store a string representation of the VariableBinding you can retrieve the string representation of the underlying Variable

e.g.

List<String> variables = new ArrayList<String>();
for (VariableBinding binding : event.getPDU().getVariableBindings()) {
    variables.add(binding.getVariable().toString());
}

It all depends on what you're wanting to achieve.

edited Dec 7, 2017 at 9:54

answered Dec 7, 2017 at 9:11

Spangen

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7 Comments

Active Over a year ago

cannot find symbol classList

Spangen Over a year ago

You need to import java.util.List and ArrayList. Will edit Answer

Active Over a year ago

Thanks Spangen, can you show me the entire command including the getPDU part?

Spangen Over a year ago

What is the full type of VariableBinding including its package? For instance is it a org.snmp4j.smi.VariableBinding ?

Active Over a year ago

yes, snmp4j, returns multiple variables

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