helloworld.java~28~

来自「提供了常用的JAVA技术的示例」· JAVA~28~ 代码 · 共 51 行

package helloworld;

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


public class helloworld {
  boolean packFrame = false;

  //Construct the application
  public helloworld() {
    Frame1 frame = new Frame1();
    JPanel panel = new JPanel();
    JButton button=new JButton("sunxiaomei");
    panel.add(button);
    System.out.println(button);
    frame.contentPane.add(panel);
    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    //Center the window
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  //Main method
  public static void main(String[] args) {
    System.out.println("helloworld!");
    System.out.println("第一个小程序！");
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new helloworld();
  }
}