Java6学习笔记22——在Swing中不使用Layout管理器直接描绘窗口_java不用布局管理器,如何设计layout-优快云博客

本文链接：https://blog.youkuaiyun.com/gnuhpc/article/details/4380896

本文介绍了一个使用Java Swing创建GUI界面的具体实例。通过设置不同位置的按钮并为它们添加监听器来实现窗口的基本交互功能。

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import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.Container;
import java.awt.Insets;
import java.awt.Dimension;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class XYLayout extends JFrame implements ActionListener {
    public static void main(String arg[]) {
        new XYLayout();
    }
    public XYLayout() {
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        } );
        buildFrame();
        setLocation(250,150);
        setVisible(true);
    }
    private void buildFrame() {
        JButton button;
        Dimension size;

        Container pane = getContentPane();
        pane.setLayout(null);

        Insets insets = pane.getInsets();

        button = new JButton("first");
        size = button.getPreferredSize();
        button.setBounds(25 + insets.left,15 + insets.top,
             size.width,size.height);
        pane.add(button);

        button = new JButton("second");
        size = button.getPreferredSize();
        button.setBounds(55 + insets.left,120 + insets.top,
             size.width,size.height);
        pane.add(button);

        button = new JButton("Exit");
        size = button.getPreferredSize();
        button.addActionListener(this);
        button.setBounds(150 + insets.left,45 + insets.top,
             size.width + 50,size.height + 20);
        pane.add(button);

        int width = 300 + insets.left + insets.right;
        int height = 200 + insets.top + insets.bottom;
        setSize(width,height);
    }
    public void actionPerformed(ActionEvent e) {
        String selection = e.getActionCommand();
        if(selection.equals("Exit")) {
            System.exit(0);
        }
    }
}