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Editorial Team
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Asked: 2026-06-15T04:17:54+00:00

I am trying to validate a string places in my HTML as a tag

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I am trying to validate a string places in my HTML as a tag inside of my Java program so that if someone changes the HTML tag string my Java program checks the string if it is what I wrote.

Here is my java…

public void init()
{
    String name = getParameter("author");
    String course = getParameter("class");


    if (name == "goes here")
    JOptionPane.showMessageDialog (null, "Good, it will setVisible(true)", "Library System", JOptionPane.WARNING_MESSAGE);
    if (name != "goes here")
        JOptionPane.showMessageDialog (null, "NOT good and will setVisible(false)", "Library System", JOptionPane.WARNING_MESSAGE);

    Container contain = getContentPane();
    contain.add(new LibraryPanel(name, course));
    setVisible(true);
}

Here is my HTML…

<html>
<body>
<applet code=3.LibraryFrame.class width=650 height=700>
    <param name=author value="goes here">
    <param name=class value="className">
</applet>

</body>
</html>

So when my string in my HTML tag is correct however it always says it doesnt match. I even have placed the name and course variable in my showMessageDialog and it matches.

Any ideas on why it isn’t correctly validating?

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1 Answer

  1. Editorial Team
    if (name == "David Duke")

    Never use == or != in Java to compare strings. Use equals() instead:

    if (name.equals("David Duke"))

    Note that == checks if the two arguments on the left and the right of it refer to the exact same object – it does not check if the contents of two objects are the same.

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