e983. modifying text in a jtextarea component.txt

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The text in a text area can be modified using the method described in e970 Modifying Text in a JTextComponent. However, the text area supports a similar set of convenience editing methods that are demonstrated in this example. 
    // Create the text area
    JTextArea ta = new JTextArea("Initial Text");
    
    // Insert some text at the beginning
    int pos = 0;
    ta.insert("some text", pos);
    
    // Insert some text after the 5th character
    pos = 5;
    ta.insert("some text", pos);
    
    // Append some text
    ta.append("some text");
    
    // Replace the first 3 characters with some text
    int start = 0;
    int end = 3;
    ta.replaceRange("new text", start, end);
    
    // Delete the first 5 characters
    start = 0;
    end = 5;
    ta.replaceRange(null, start, end);

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