1.简单窗体

代码：


package mytest;

import javax.swing.JFrame;

public class myjframe {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        //一个简单的JFrame 
        JFrame jf = new JFrame();//实例化一个JFrame对象 
        //设置窗体的属性：大小、出现位置、点击关闭时退出程序、窗体可见... 
        jf.setTitle("一个简单的窗体");//设置窗体的标题 
        jf.setSize(300,300);//设置窗体的大小 
        jf.setLocationRelativeTo(null);//设置窗体居中出现 
        jf.setDefaultCloseOperation(3);//设置点击关闭时退出程序，或者也可以写为jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);//设置窗体可见 
    }

}

效果图：

2.在窗体中加入控件和布局管理器FlowLayout


package mytest;

import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class myjframe {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        //一个简单的JFrame
        JFrame jf = new JFrame();//实例化一个JFrame对象
        add(jf);
        addlayout(jf);
        //设置窗体的属性：大小、出现位置、点击关闭时退出程序、窗体可见...
        jf.setTitle("一个简单的窗体");//设置窗体的标题
        jf.setSize(300,300);//设置窗体的大小
        jf.setLocationRelativeTo(null);//设置窗体居中出现
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置点击关闭时退出程序
        jf.setVisible(true);//设置窗体可见
     
    }
  
    public static void add(JFrame jf){
        JLabel label = new JLabel("标签");//实例化一个JLabel对象
        JButton button = new JButton("按钮");//实例化一个按钮对象
        JTextField text = new JTextField(4);//实例化一个显示4个字节的文本框
        JCheckBox checkbox = new JCheckBox("复选框");//实例化一个复选框
        //将这些组件添加到窗体上
        jf.add(label);
        jf.add(button);
        jf.add(text);
        jf.add(checkbox);
    }
  
    public static void addlayout(JFrame jf){
        FlowLayout flow = new FlowLayout();
        jf.setLayout(flow);
    }

}

效果图：

3.使用容器类JPanel和布局管理器BorderLayout

代码：


package mytest;

import java.awt.BorderLayout;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class myjframe {
   
    static final int WIDTH=300;
    static final int HEIGHT=200;
   
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
         JFrame jf=new JFrame("测试程序");
         jf.setSize(WIDTH,HEIGHT);
         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
         JPanel contentPane=new JPanel();
         contentPane.setLayout(new BorderLayout());//创建一个中间布局管理对象，并将contentPane的布局的对象设置为此中间布局管理对象
         jf.setContentPane(contentPane);
        
         JButton b1=new JButton("生活");
         JButton b2=new JButton("工作");
         JButton b3=new JButton("睡觉");
         JButton b4=new JButton("购物");
         JButton b5=new JButton("饮食");
        
         contentPane.add(b1,"North");//将五个普通按钮组件分别按照东、南、西、北、中五个方位添加到中间容器中
         contentPane.add(b2,"South");
         contentPane.add(b3,"East");
         contentPane.add(b4,"West");
         contentPane.add(b5,"Center");
        
         jf.setVisible(true);
    }
   
}

效果图：

4.使用多层JPanel

代码：


package mytest;

import java.awt.BorderLayout;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class myjframe {
   
    static final int WIDTH=300;
    static final int HEIGHT=200;
   
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
         JFrame jf=new JFrame("测试程序");
         jf.setSize(WIDTH,HEIGHT);
         jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
         JPanel contentPane=new JPanel();
         contentPane.setLayout(new BorderLayout());//创建一个中间布局管理对象，并将contentPane的布局的对象设置为此中间布局管理对象
         jf.setContentPane(contentPane);
        
         JPanel contentPane2=new JPanel();
         contentPane2.setLayout(new BorderLayout());
         JButton b21=new JButton("1");
         JButton b22=new JButton("2");
         JButton b23=new JButton("3");
         JButton b24=new JButton("4");
         JButton b25=new JButton("5");
         contentPane2.add(b21,"North");
         contentPane2.add(b22,"South");
         contentPane2.add(b23,"East");
         contentPane2.add(b24,"West");
         contentPane2.add(b25,"Center");
         
         
         //JButton b1=new JButton("生活");
         JButton b2=new JButton("工作");
         JButton b3=new JButton("睡觉");
         JButton b4=new JButton("购物");
         JButton b5=new JButton("饮食");
        
         contentPane.add(contentPane2,"North");
         //contentPane.add(b1,"North");
         contentPane.add(b2,"South");//将四个普通按钮组件分别按照南、西、北、中五个方位添加到中间容器中
         contentPane.add(b3,"East");
         contentPane.add(b4,"West");
         contentPane.add(b5,"Center");
        
         jf.setVisible(true);
    }
   
}

效果图：

5.使用JFrame中的setSize、setPreferredSize、pack、setBounds方法。

代码：


package mytest;

import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class myjframe {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        //一个简单的JFrame
        JFrame jf = new JFrame();//实例化一个JFrame对象
        add(jf);
        addlayout(jf);
        jf.setTitle("一个简单的窗体");//设置窗体的标题
        
        /* 
                   * 总结： 
         * 1、单独使用setSize()时，是按照设置的大小显示的；此时不能使用pack()，否则按照pack()自动适配 
         * 2、单独使用pack()时，是按照组件的大小自动适配的 
         * 3、单独使用setPreferredSize()时，设置的大小无效，必须在后面添加pack()配合显示 
         *  
         * pack() 调整此窗口的大小，以适合其子组件的首选大小和布局 
                  * 就算JFrame用setSize来设定框体大小，用了pack（）一样会改变成刚好能包含全部组件的框体。 
         *  
                  * 当使用setPreferredSize()时需要配合pack()显示，否则setPreferredSize()的设置效果不生效 
         *
          * setBounds(int x, int y, int width, int height)
            *前两个是组件左上角在容器中的坐标
            *后两个是组件的宽度和高度 
         *  
         */  
        
        //jf.setSize(300,300);//设置窗体的大小
        //jf.setPreferredSize(new Dimension(800, 600));  
        jf.pack();
        //jf.setBounds(300,200,300,200);
        
        
        jf.setLocationRelativeTo(null);//设置窗体居中出现
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置点击关闭时退出程序
        jf.setVisible(true);//设置窗体可见
     
    }
  
    public static void add(JFrame jf){
        JLabel label = new JLabel("标签");//实例化一个JLabel对象
        JButton button = new JButton("按钮");//实例化一个按钮对象
        JTextField text = new JTextField(4);//实例化一个显示4个字节的文本框
        JCheckBox checkbox = new JCheckBox("复选框");//实例化一个复选框
        //将这些组件添加到窗体上
        jf.add(label);
        jf.add(button);
        jf.add(text);
        jf.add(checkbox);
    }
  
    public static void addlayout(JFrame jf){
        FlowLayout flow = new FlowLayout();
        jf.setLayout(flow);
    }

}

效果图：

6.使用布局管理器GridLayout

代码：


package mytest;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class myjframe {
  
    static final int WIDTH=300;
    static final int HEIGHT=200;
  
    public static void main(String[] args) {
        // TODO 自动生成的方法存根
        JFrame jf=new JFrame("测试程序");
        jf.setSize(WIDTH,HEIGHT);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
        JPanel contentPane=new JPanel();
        jf.setContentPane(contentPane);
        JButton b1=new JButton("港币");
        JButton b2=new JButton("人民币");
        JButton b3=new JButton("美元");
        JButton b4=new JButton("欧元");
        JButton b5=new JButton("英镑");
        JButton b6=new JButton("主板");
        /*JButton b7=new JButton("7");
        JButton b8=new JButton("8");
        JButton b9=new JButton("9");
        JButton b10=new JButton("10");//*/
        
        GridLayout gird=new GridLayout(3,2); //创建一个 GridLayout布局管理器对象，将之行数设为3，列数设为2,并且将之作为中间容器的布局管理器
        contentPane.setLayout(gird);

        contentPane.add(b1); //将六个普通按钮组件一一添加到中间容器中
        contentPane.add(b2);
        contentPane.add(b3);
        contentPane.add(b4);
        contentPane.add(b5);
        contentPane.add(b6);
        /*contentPane.add(b7);
        contentPane.add(b8);
        contentPane.add(b9);
        contentPane.add(b10);
        //*/
        jf.pack();
    }
  
}

效果图：

7.使用setBounds

代码：


package mytest;

import java.awt.Dimension;
import javax.swing.JButton;
import javax.awing.JFrame;
import javax.swing.JPanel;


public class myjframe {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        // 设置窗体属性
        JFrame frame = new JFrame("setBoundsDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       
       
        //设置panel的layout以及sieze
        JPanel jpanel = new JPanel();
        //System.out.println("default PreferredSize is " + jpanel.getPreferredSize());
        //System.out.println("default Size is " + jpanel.getSize());
        jpanel.setLayout(null);
        //System.out.println("In null layout, the PreferredSize is " + jpanel.getPreferredSize());
        //System.out.println("In null layout, the Size is " + jpanel.getSize());
        jpanel.setPreferredSize(new Dimension(400, 400));
        //添加按钮
        JButton button11 = new JButton("setBounds");
        JButton button12 = new JButton("setLocationAndSetSize");
       
        button11.setBounds(20, 20, 100, 100);
        button12.setLocation(250, 250);
        button12.setSize(100, 100);
       
        jpanel.add(button11);
        jpanel.add(button12);
       
       
        frame.setContentPane(jpanel);
        frame.pack();
        frame.setLocationRelativeTo(null);//设置窗体居中
        frame.setVisible(true);
    }
}

效果图：

8.使用布局管理器GridBagLayout

代码：


package mytest;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class myjframe{
    public static void main(String[] args) {
        JButton b;
        GridBagConstraints c;
        int gridx, gridy, gridwidth, gridheight, anchor, fill, ipadx, ipady;
        double weightx, weighty;
        Insets inset;

        JFrame f = new JFrame();

        GridBagLayout gridbag = new GridBagLayout();
        Container contentPane = f.getContentPane();
        contentPane.setLayout(gridbag);

        b = new JButton("first");
        gridx = 0;
        gridy = 0;
        //gridy = 1;
        gridwidth = 1;
        //gridwidth = GridBagConstraints.REMAINDER;
        gridheight = 1;
        weightx = 10;
        weighty = 1;
        anchor = GridBagConstraints.CENTER;
        fill = GridBagConstraints.HORIZONTAL;
        inset = new Insets(0, 0, 0, 0);
        ipadx = 0;
        ipady = 0;
        c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
                weightx, weighty, anchor, fill, inset, ipadx, ipady);
        gridbag.setConstraints(b, c);
        contentPane.add(b);

        b = new JButton("second");
        gridx = 1;
        gridy = 0;
        gridwidth = 20;
        gridheight = 1;
        weightx = 1;
        weighty = 1;
        anchor = GridBagConstraints.CENTER;
        fill = GridBagConstraints.HORIZONTAL;
        inset = new Insets(0, 0, 0, 0);
        ipadx = 50;
        ipady = 0;
        c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
                weightx, weighty, anchor, fill, inset, ipadx, ipady);
        gridbag.setConstraints(b, c);
        contentPane.add(b);
/*
        b = new JButton("third");
        gridx = 0;
        gridy = 1;
        gridwidth = 1;
        gridheight = 1;
        weightx = 1;
        weighty = 1;
        anchor = GridBagConstraints.CENTER;
        fill = GridBagConstraints.HORIZONTAL;
        inset = new Insets(0, 0, 0, 0);
        ipadx = 0;
        ipady = 50;
        c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
                weightx, weighty, anchor, fill, inset, ipadx, ipady);
        gridbag.setConstraints(b, c);
        contentPane.add(b);

        b = new JButton("fourth");
        gridx = 1;
        gridy = 1;
        gridwidth = 1;
        gridheight = 1;
        weightx = 1;
        weighty = 1;
        anchor = GridBagConstraints.CENTER;
        fill = GridBagConstraints.HORIZONTAL;
        inset = new Insets(0, 0, 0, 0);
        ipadx = 0;
        ipady = 0;
        c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
                weightx, weighty, anchor, fill, inset, ipadx, ipady);
        gridbag.setConstraints(b, c);
        contentPane.add(b);

        b = new JButton("This is the last button");
        gridx = 2;
        gridy = 1;
        gridwidth = 1;
        gridheight = 2;
        weightx = 1;
        weighty = 1;
        anchor = GridBagConstraints.CENTER;
        fill = GridBagConstraints.HORIZONTAL;
        inset = new Insets(0, 0, 0, 0);
        ipadx = 0;
        ipady = 50;
        c = new GridBagConstraints(gridx, gridy, gridwidth, gridheight,
                weightx, weighty, anchor, fill, inset, ipadx, ipady);
        gridbag.setConstraints(b, c);
        contentPane.add(b);
//*/
        
        f.setTitle("GridBagLayout");
        f.setSize(500, 500);
        //f.pack();
        f.setVisible(true);
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

效果图：

代码：


package mytest;

import javax.swing.*;
import java.util.*;
import java.awt.*;

public class myjframe{

     public static void main(String args[]) {
        JFrame f = new JFrame("GridBag Layout Example");

        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        f.setLayout(gridbag);
//添加按钮1
        c.fill = GridBagConstraints.BOTH;
        c.gridwidth=1;
        c.gridheight=2;
        c.weightx=0.0;//默认值为0.0
        c.weighty=0.0;//默认值为0.0
        c.anchor=GridBagConstraints.SOUTHWEST;
        JButton jButton1 = new JButton("按钮1");
        gridbag.setConstraints(jButton1, c);
        f.add(jButton1);
//添加按钮2       
        c.fill = GridBagConstraints.NONE;
        c.gridwidth=GridBagConstraints.REMAINDER;
        c.gridheight=1;
        c.weightx=1.0;//默认值为0.0
        c.weighty=0.8;
        JButton jButton2 = new JButton("按钮2");
        gridbag.setConstraints(jButton2, c);
        f.add(jButton2);
//添加按钮3
        c.fill = GridBagConstraints.BOTH;
        //c.gridy=2;
        c.gridwidth=1;
        c.gridheight=1;
        c.weighty=0.2;
        //c.insets.set(10, 10, 10, 10);;
        JButton jButton3 = new JButton("按钮3");
        gridbag.setConstraints(jButton3, c);
        f.add(jButton3);
        
        /*
//添加按钮4
        c.fill = GridBagConstraints.BOTH;
        //c.gridy=2;
        c.gridwidth=1;
        c.gridheight=2;
        c.weighty=0.2;
        //c.insets.set(10, 10, 10, 10);
        JButton jButton4 = new JButton("按钮4");
        gridbag.setConstraints(jButton4, c);
        f.add(jButton4);
        //*/
      
        /*
//添加按钮5
        c.fill = GridBagConstraints.BOTH;
        c.gridy=3;
        c.gridwidth=1;
        c.gridheight=1;
        c.weighty=0.2;
        //c.insets.set(10, 10, 10, 10);
        JButton jButton5 = new JButton("按钮5");
        gridbag.setConstraints(jButton5, c);
        f.add(jButton5);
        //*/
        
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(500,500);
        f.setVisible(true);
     }
}

效果图：

睿虎的博客

2019年3月29日星期五

Java简单窗体

1.简单窗体

2.在窗体中加入控件和布局管理器FlowLayout

3.使用容器类JPanel和布局管理器BorderLayout

4.使用多层JPanel

5.使用JFrame中的setSize、setPreferredSize、pack、setBounds方法。

6.使用布局管理器GridLayout

7.使用setBounds

8.使用布局管理器GridBagLayout

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