Java Swing 绝对布局管理方法，null布局【图】

最新推荐文章于 2025-06-16 22:40:19 发布

opshres169

最新推荐文章于 2025-06-16 22:40:19 发布

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本文介绍了一个使用Java Swing创建登录界面的实例，详细展示了如何通过null布局管理器手动设置组件的位置和大小，包括按钮、文本框等元素的精确摆放。

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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 Logextends 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);

    }

}