Java Swing 絕對布局管理方法，null布局【圖】

首先把相關容器的布局方式設為 setLayout(null);

然后調用組件的  setBounds() 方法

設置button的位置為(100,100) 長寬分別為 60，25

jButton.setBounds(new Rectangle(100, 100, 60, 25));

 

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Toolkit;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class Log extends JFrame {
	public static void main(String[] args) {
		Log log = new Log();
	}
	private JButton btLog;
	private JTextField tfUser;
	private JPasswordField tfPwd;
	private JCheckBox pwdKeep;
	private JComboBox adminType;

	public Log() {
		super("固定資產管理系統");
		super.setSize(380, 292);
		super.setVisible(true);
		super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		centered(this);
		btLog = new JButton("登     錄");
		btLog.setBounds(new Rectangle(93, 220, 180, 30));//參數分別是坐標x，y，寬，高
		this.setLayout(null);//設置布局管理器為空
		this.add(btLog);
		tfUser = new JTextField();
		tfUser.setBounds(new Rectangle(73, 115, 220, 25));
		this.add(tfUser);
		tfPwd = new JPasswordField();
		tfPwd.setBounds(new Rectangle(73, 150, 220, 25));
		this.add(tfPwd);
		pwdKeep = new JCheckBox("記住密碼");
		pwdKeep.setBounds(new Rectangle(68, 185, 110, 25));
		this.add(pwdKeep);
		adminType = new JComboBox(new String[] { "普通職員", "管理員", "高級管理員" });
		adminType.setBounds(new Rectangle(183, 185, 100, 25));
		this.add(adminType);

	}
//布局居中方法
	public void centered(Container container) {
		Toolkit toolkit = Toolkit.getDefaultToolkit();
		Dimension screenSize = toolkit.getScreenSize();
		int w = container.getWidth();
		int h = container.getHeight();
		container.setBounds((screenSize.width - w) / 2,
				(screenSize.height - h) / 2, w, h);
	}
}