How to clear all textfield of jframe using loop?

问题:

I'm developing Java application using NetBeans. I have 5 JTextFields and 2 JTextArea in JFrame. I want to clear them at once using a loop. How can it be done?

回答1:

Iterate over all of the components and set the text of all JTextField and JTextArea objects to an empty String:

//Note: "this" should be the Container that directly contains your components
//(most likely a JPanel).
//This won't work if you call getComponents on the top-level frame.
for (Component C : this.getComponents())
{    
    if (C instanceof JTextField || C instanceof JTextArea){

        ((JTextComponent) C).setText(""); //abstract superclass
    }
}

回答2:

The appropriate code should be this one

    Component[] components = jframe.getContentPane().getComponents();
    for (Component component : components) {
        if (component instanceof JTextField || component instanceof JTextArea) {
            JTextComponent specificObject = (JTextComponent) component;
            specificObject.setText("");
        }
    }