javajframe焦点_JavaGUI：如何在JFrame上的JPanel中设置焦点？

尝试这个代码..我所做的只是在最后移动requestFocus()方法.

基本上这些是你要做的两件事情,当它按回车键并且默认情况下它是重点.

frame.getRootPane().setDefaultButton(start);

start.requestFocus();

package sof;

import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

public class TestFrame {

public static void main(String[] args) {

// Launch the frame:

JFrame frame &＃61; new JFrame();

frame.setTitle("Welcome!");

frame.setSize(520, 480);

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Add the image:

ImageIcon heroShotImage &＃61; new ImageIcon("heroShot.jpg");

JPanel heroShotPanel &＃61; new JPanel();

JLabel heroShot &＃61; new JLabel(heroShotImage);

heroShotPanel.add(heroShot);

// Create a panel to hold the "Start" button:

JPanel submitPanel &＃61; new JPanel(new FlowLayout(FlowLayout.CENTER));

JButton start &＃61; new JButton("Start");

start.setToolTipText("Click to use library");

start.addActionListener(new ActionListener() {

&＃64;Override

public void actionPerformed(ActionEvent e) {

System.out.println("I AM PRESSED");

}

});

submitPanel.add(start);

frame.getContentPane().add(heroShotPanel, BorderLayout.NORTH);

frame.getContentPane().add(submitPanel, BorderLayout.SOUTH);

frame.setVisible(true);

frame.getRootPane().setDefaultButton(start);

start.requestFocus();

}

}