java新手做记事本获取当前屏幕尺寸出现错误求解答

CaribbeanTangsen 2016-07-02 07:31:04

看代码我想创建toolkit的对象然后调用Toolkit.getScreenSize()
初始化的时候一直报错
api上面写的构造方法是没有参数的
求大神解答

package GUI;



import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.FileDialog;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;



import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JOptionPane;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;



public class is3 extends JFrame{

	public is3 (String title){

		super(title);

		init();

		Lis();

	}

	private JTextArea txtin;					//多行文本输入

	private Container cpane;					//窗体容器

	private Toolkit tool;

	private int width = 800;

	private int height = 600;

	private JScrollPane spane;

	private JMenuBar menubar;

	private JMenu m_file;

	private JMenu m_help;

	private JMenuItem i_new;

	private JMenuItem i_open;

	private JMenuItem i_save;

	private JMenuItem i_end;

	private JMenuItem i_about;

	private JDialog win_about;

	private JLabel lable;

	private Dimension size  ;

	public void Mynotpad(){						//建立界面

		cpane.add(spane,BorderLayout.CENTER);

		cpane.add(menubar,BorderLayout.NORTH);

		size = Toolkit.getScreenSize();

		this.setBounds(width(size.width), hight(size.height), width, height);

		this.setVisible(true);

		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}

	private void init(){						//初始化属性

		txtin = new JTextArea();

		cpane =  this.getContentPane();

		tool = new Toolkit();

		spane = new JScrollPane(txtin);

		spane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

		menubar = new JMenuBar();

		i_new = new JMenuItem("新建");

		i_open = new JMenuItem("打开");

		i_save = new JMenuItem("保存");

		i_end = new JMenuItem("关闭");

		i_about = new JMenuItem("关于");

		m_file = new JMenu("文件");

		m_help = new JMenu("帮助");

		win_about = new JDialog(this, "关于");

		lable = new JLabel("<html>作者：123<br/>QQ：2123<br/>电话：123</html>");

		m_file.add(i_new);

		m_file.add(i_open);

		m_file.add(i_save);

		m_file.add(i_end);

		m_help.add(i_about);

		menubar.add(m_file);

		menubar.add(m_help);

		

	}

	 

	private int hight(int size){





		int h = (size/2) - (height/2);

		return h;

		} 

	private int width(int size){

		int w = (size/2) - (width/2);

		return w;

		} 

	private void Lis(){							//监听事件

		i_end.addActionListener(new ActionListener() {

			@Override

			public void actionPerformed(ActionEvent e) {

				// TODO Auto-generated method stub

				l_end();

			}

		});

		i_new.addActionListener(new ActionListener() {

			@Override

			public void actionPerformed(ActionEvent e) {

				// TODO Auto-generated method stub

				l_new();

			}

		});

		i_open.addActionListener(new ActionListener() {

			@Override

			public void actionPerformed(ActionEvent e) {

				// TODO Auto-generated method stub

				l_open();

			}

		});

		i_about.addActionListener(new ActionListener() {

			@Override

			public void actionPerformed(ActionEvent e) {

				// TODO Auto-generated method stub

				l_about();

			}

		});

	}

	private void l_end (){

		System.exit(0);

	}

	private void l_new (){

		if(!txtin.getText().equals("")){

			int a = JOptionPane.showConfirmDialog(null, "是否保存现有文件？", "是否保存", JOptionPane.YES_NO_OPTION);

			if(a == JOptionPane.YES_OPTION){

				FileDialog save = new FileDialog(this, "保存到", FileDialog.SAVE);

				save.setVisible(true);

			}else{

				txtin.setText("");

			}

		}

	}

	private void l_open(){

		FileDialog save = new FileDialog(this, "打开", FileDialog.LOAD);

		save.setVisible(true);

	}

	private void l_about(){

		win_about.add(lable);

		win_about.setSize(100, 100);

		Dimension size = this.getSize();

		System.out.println(size.height+"\n"+size.width);

		

		win_about.setVisible(true);

		

	}

}