Java Swing 絕對佈局管理方法，null佈局

 <p>首先把相關容器的佈局方式設爲 setLayout(null);</p>

<p>然後調用組件的 &nbsp;setBounds() 方法</p>

<p>設置button的位置爲(100,100) 長寬分別爲 60，25</p>

<p>jButton.setBounds(new Rectangle(100, 100, 60, 25));</p>

<p><img src="http://images.cnitblog.com/blog/391736/201302/17145934-59cb1cb5863046349fe65e1b714a5bdf.jpg" alt="" /></p>

<p>&nbsp;</p>

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<pre class="brush:java;gutter:false;">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));//參數分別是座標x，y，寬，高

this.setLayout(null);//設置佈局管理器爲空

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);

 

}

//佈局居中方法

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);

}

}

</pre>

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