Java Swing 绝对布局管理方法，null布局（转）-白红宇

Java Swing 绝对布局管理方法，null布局（转）

阅读量：6539 次

发布时间：2019-06-24

本文共 1876 字，大约阅读时间需要 6 分钟。

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);
    
}
}
         
       