如何更改背景颜色？

Question

I am working on a program that has 5 different color radio buttons, and when clicked, the background should change to the corresponding color. My background is not changing. I cannot for the life of me figure out what is wrong with my code. Can someone out there help me find my problem? Thank you! My code is as follows:

public void actionPerformed(ActionEvent e)
{
    if (blue.getState()) f.setBackground(Color.blue);
    else if (red.getState()) f.setBackground(Color.red);
    else if (yellow.getState()) f.setBackground(Color.yellow);
    else if (pink.getState()) f.setBackground(Color.pink);
    else if (gray.getState()) f.setBackground(Color.gray);
} //end of actionPerformed method

public void itemStateChanged(ItemEvent e)
{
}

Answer 1

More than likely you're using java.awt.CheckBox components (from your earlier question ) which respond to ItemListeners but not ActionListeners . Therefore move your code to the itemStateChanged method

public void itemStateChanged(ItemEvent e) {

    if (blue.getState()) {
        f.setBackground(Color.BLUE);
    } else if (red.getState()) {
        f.setBackground(Color.RED);
    } else if (yellow.getState()) {
        f.setBackground(Color.YELLOE);
    } else if (pink.getState()) {
        f.setBackground(Color.PINK);
    } else if (gray.getState()) {
        f.setBackground(Color.GRAY);
    }
}

• Use braces to delimit scope
• Notice the use of newer uppercase Color constants
• AWT is an old limited UI library compared to the newer lightweight Swing which is feature rich. Swing JCheckBoxes support ActionListeners