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A re-usable library of Java classes. Originally stand-alone, many of the classes have since gone into various parts of the Jakarta Commons project, and thus this package contains various dependencies.

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package com.generationjava.util;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

public class StringJoinerTest extends TestCase {

    public StringJoinerTest(String name) {
        super(name);
    }

    //-----------------------------------------------------------------------
    // To test: 
    //   StringJoiner(String, String) -> join(String[])

    public void testJoin() {
        StringJoiner joiner = new StringJoiner("??", "?");
        assertEquals("onetwo", joiner.join(new String[] { "one", "two" }));
        assertEquals("12", joiner.join(new String[] { "1", "2" }));
        assertEquals("unodos", joiner.join(new String[] { "uno", "dos" }));
    }

}