Archive for August, 2004

Can I use “==” to compare two String?

Posted in 技术 at August 14th, 2004 | No Comments »

These days, when I’m reading some other guy’s code, I encounter some problem. In these code, I can read following codes:
JButton button = new JButton("OK");
button.setActionCommand("OK");
button.addActionListener(this);
……
actionPerformed(e) {
    String s = e.getActionCommand();
    if(s=="OK")
    ……
}
Look, it use “==” but not “equals” here. “Oh, it must be a bug!”, I told myself. But, wait, when I excuted the […]

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