StrConcatCommand.java

public class StrConcatCommand extends Node
{
    public Parser parser;
    
    public StrConcatCommand() {}
    
    public StrConcatCommand(Parser parser)
    {
        this.parser = parser;
    }
           
    public Object eval()
    {
        String str1 = (String) parser.getVariable("str1");
        String str2 = (String) parser.getVariable("str2");
        StringBuffer sb = new StringBuffer(str1);
        return (sb.append(str2)).toString();
    }
}