Java Swing 绝对布局管理方法，null布局

 

首先把相关容器的布局方式设为 setLayout(null);

然后调用组件的  setBounds() 方法

设置button的位置为(100,100) 长宽分别为 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("固定资产管理系统");

super.setSize(380, 292);

super.setVisible(true);

super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

centered(this);

btLog = new JButton("登     录");

btLog.setBounds(new Rectangle(93, 220, 180, 30));//参数分别是坐标x，y，宽，高

this.setLayout(null);//设置布局管理器为空

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("记住密码");

pwdKeep.setBounds(new Rectangle(68, 185, 110, 25));

this.add(pwdKeep);

adminType = new JComboBox(new String[] { "普通职员", "管理员", "高级管理员" });

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);

}

}