ex914.txt

JAVA 基础例题包含了JAVA常见的问题和常见的习题

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Frame3  extends JFrame implements ActionListener
{	int row=6,col=30;
 		JPanel p1=new JPanel(),p2=new JPanel();
 		JTextArea ta=new JTextArea("文本区行数："+row+"   列数："+col,row,col);
 		JButton exit=new JButton("退出"),dialog=new JButton("对话框");
 		Frame3()
		{	setTitle("对话框的父窗口");
    			Container c=getContentPane();
  			setSize(350,200);
			c.add("Center",p1);
  			c.add("South",p2);
  			p1.add(ta);
			p2.add(exit);
  			p2.add(dialog);
  			exit.addActionListener(this);
			dialog.addActionListener(this);
  			setVisible(true);
		}
		public static void main(String args[])
		{	new Frame3();
		}
		public void actionPerformed(ActionEvent e)
		{	if(e.getSource()==exit)
			  System.exit(0);
  			else
		 	{	MyDialog dlg=new MyDialog(this,true);
  				dlg.show();
			}
		}
		class MyDialog extends Dialog implements ActionListener
		{	JLabel label1=new JLabel("请输入行数");
			JLabel label2=new JLabel("请输入列数");
			JTextField rows=new JTextField(50);
			JTextField columns=new JTextField(50);
			JButton ok=new JButton("确定");
			JButton cancel=new JButton("取消");
			MyDialog(Frame3 parent,boolean modal)
			{	super(parent,modal);
 				setTitle("自定义对话框");
 				setSize(260,140);
 				setResizable(false);
				setLayout(null);
				add(label1);
				add(label2);
				label1.setBounds(50,30,65,20);
				label2.setBounds(50,60,65,20);
				add(rows);
				add(columns);
				rows.setText(Integer.toString(ta.getRows()));
				columns.setText(Integer.toString(ta.getColumns()));
				rows.setBounds(120,30,90,20);
				columns.setBounds(120,60,90,20);
				add(ok);		add(cancel);
				ok.setBounds(60,100,60,25);
				cancel.setBounds(140,100,60,25);
				ok.addActionListener(this);
				cancel.addActionListener(this);
			}
		public void actionPerformed(ActionEvent e)
		{	if(e.getSource()==ok)
			{	int row=Integer.parseInt(rows.getText());
   				int col=Integer.parseInt(columns.getText());
   				ta.setRows(row);
   				ta.setColumns(col);
   				ta.setText("文本区行数："+row+"列数："+col);
			}
			dispose();      //用来关闭自定义对话框
		}
}
}