62.【GUI编程】（四）

基本思路:
1.获取地址: 类名.class.getResource()；    //获取地址
2.创建imageIcon : ImageIcon imageIcon=new ImageIcon(url);
3.设置成标签: 标签对象.setIcon();
4.水平居中: 标签对象.setHorizontalAlignment(SwingConstants.CENTER);

package KuangStudy;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class first extends JFrame  {
    public first(){
       JLabel label_one=new JLabel("吉士先生背景图片");
       //获取图片地址；
        URL url = first.class.getResource("imag.jpg");
        //从指定的URL创建一个ImageIcon。
        ImageIcon imageIcon=new ImageIcon(url);
        //把图片设置成标签
        label_one.setIcon(imageIcon);
        //标签水平线居中
        label_one.setHorizontalAlignment(SwingConstants.CENTER);
        //把标签添加到窗体中去
        this.add(label_one);
        //进行窗体的设置效果
        this.setSize(400,400);
        this.setVisible(true);
        this.setLocationRelativeTo(null);
    }
}

package KuangStudy;
public class Test {
    public static void main(String[] args) {
        first first_one=new first();
}
}

基本思路:
1.返回此框架的 contentPane对象。 
 Container container=this.getContentPane();
2.设置间距:
container.setLayout(new GridLayout(2,1,10,10));

package KuangStudy;
import javax.swing.*;
import java.awt.*;
public class first extends JFrame  {
    public first(){
        Container container=this.getContentPane();//框体的容器
        container.setLayout(new GridLayout(2,1,10,10));
        JPanel jPanel_one=new JPanel(new GridLayout(1,3));
        JPanel jPanel_two=new JPanel(new GridLayout(1,2));
        JPanel jPanel_three=new JPanel(new GridLayout(2,3));
        JPanel jPanel_four=new JPanel(new GridLayout(3,2));
        jPanel_one.add(new JButton("1"));
        jPanel_one.add(new JButton("1"));
        jPanel_one.add(new JButton("1"));
        jPanel_two.add(new JButton("1"));
        jPanel_two.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_three.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        jPanel_four.add(new JButton("1"));
        container.add(jPanel_one);
        container.add(jPanel_two);
        container.add(jPanel_three);
        container.add(jPanel_four);
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }
}

package KuangStudy;
public class Test {
    public static void main(String[] args) {
        first first_one=new first();
}
}

基本思路:
1.文本域添加到滑动块中去
 JScrollPane jScrollPane_one=new JScrollPane(textArea_one);
2.滑动块添加到画板中去

package KuangStudy;
import javax.swing.*;
import java.awt.*;
public class first extends JFrame  {
    public first(){
        Container container=this.getContentPane();//框体的容器
        //文本域
        TextArea textArea_one=new TextArea(20,30);
        //设置默认的文字
        textArea_one.setText("欢迎来到我的世界! ");
        //把文本域添加到滚动块中去
        JScrollPane jScrollPane_one=new JScrollPane(textArea_one);
        //把滚动块添加到窗体中去
        container.add(jScrollPane_one);
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }
}

package KuangStudy;
public class Test {
    public static void main(String[] args) {
        first first_one=new first();
}
}

基本思路:
1.导入图片 地址url
2.利用url生成图标
3.按钮设置成图标: button.setIcon(imag);
4.按钮添加到窗体.

package KuangStudy;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class first extends JFrame  {
    public first(){
        //框体的容器
        Container container=this.getContentPane();
        URL url = first.class.getResource("imag.jpg");
        //url导入变成ICon
        ImageIcon Icon_one=new ImageIcon(url);
        JButton button=new JButton();
        //把这个图标放在按钮上
        button.setIcon(Icon_one);
        //显示图片标题
        button.setToolTipText("图片按钮");
        container.add(button);
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }
}

package KuangStudy;
public class Test {
    public static void main(String[] args) {
        first first_one=new first();
}
}

基本思路:
1.单选框: JRadioButton
2.分组: ButtonGroup
3.把单选按钮添加到分组中,进行分组
 buttonGroup_one.add(jRadioButton_one);
4.单选按钮添加到窗体

package KuangStudy;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class first extends JFrame  {
    public first(){
        //框体的容器
        Container container=this.getContentPane();
        //单选框
       JRadioButton jRadioButton_one=new JRadioButton("A 你是大傻瓜");
       JRadioButton jRadioButton_two=new JRadioButton("B 我是大傻瓜");
       JRadioButton jRadioButton_three=new JRadioButton("C 我俩都是大傻瓜");
       //由于单选框只能选择一个，所以我们要对其分组
        ButtonGroup buttonGroup_one=new ButtonGroup();
        //单选按钮分组添加
        buttonGroup_one.add(jRadioButton_one);
        buttonGroup_one.add(jRadioButton_two);
        buttonGroup_one.add(jRadioButton_three);
        //添加到窗体中
        container.add(jRadioButton_one,BorderLayout.NORTH);
        container.add(jRadioButton_two,BorderLayout.CENTER);
        container.add(jRadioButton_three,BorderLayout.SOUTH);
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }
}

package KuangStudy;
public class Test {
    public static void main(String[] args) {
        first first_one=new first();
}
}