控制JFrame窗体的位置 居中或任意位置

package swings;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class LoadPosition extends JFrame {

	private JPanel contentPane;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					LoadPosition frame = new LoadPosition();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public LoadPosition() {
		setTitle("\u63A7\u5236\u7A97\u4F53\u52A0\u8F7D\u65F6\u7684\u4F4D\u7F6E");
		addWindowListener(new WindowAdapter() {
			@Override
			public void windowOpened(WindowEvent e) {
				do_this_windowOpened(e);
			}
		});
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 450, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setLayout(new BorderLayout(0, 0));
		setContentPane(contentPane);
	}

	protected void do_this_windowOpened(WindowEvent e) {
		setLocationRelativeTo(null);// 设置窗体居中
	}
}

例子

2：任意位置：

package swings;

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.text.NumberFormat;

import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;

public class SetLocation extends JFrame {

	private JPanel contentPane;
	private JFormattedTextField leftField;
	private JFormattedTextField topField;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
		} catch (Throwable e) {
			e.printStackTrace();
		}
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					SetLocation frame = new SetLocation();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
		File file = new File("ac.txt");
	}

	/**
	 * Create the frame.
	 */
	public SetLocation() {
		setTitle("\u8BBE\u7F6E\u7A97\u4F53\u5728\u5C4F\u5E55\u4E2D\u7684\u4F4D\u7F6E");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 295, 157);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		JLabel label = new JLabel("\u5DE6\u8FB9\u8DDD\uFF1A");
		label.setBounds(6, 12, 55, 18);
		contentPane.add(label);

		leftField = new JFormattedTextField(NumberFormat.getIntegerInstance());
		leftField.setBounds(69, 6, 204, 30);
		contentPane.add(leftField);
		leftField.setColumns(10);

		JLabel label_1 = new JLabel("\u4E0A\u8FB9\u8DDD\uFF1A");
		label_1.setBounds(6, 42, 55, 18);
		contentPane.add(label_1);

		topField = new JFormattedTextField(NumberFormat.getIntegerInstance());
		topField.setBounds(69, 36, 204, 30);
		contentPane.add(topField);
		topField.setColumns(10);

		JButton button = new JButton("\u8BBE\u7F6E");
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				do_button_actionPerformed(e);
			}
		});
		button.setBounds(97, 83, 90, 30);
		contentPane.add(button);
	}

	protected void do_button_actionPerformed(ActionEvent e) {
		Object value = leftField.getValue();// 获取左边距坐标文本
		Object value2 = topField.getValue();// 获取上边距坐标文本
		if (value == null || value2 == null)
			return;
		int left = ((Number) value).intValue();// 提取左边距坐标值
		int top = ((Number) value2).intValue();// 提取上边距坐标值
		setLocation(left, top);// 用左边距和上边距坐标值设置窗体位置
	}
}