java-窗口之间信息的传递

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

public class test1 extends JFrame{
	JTextField textfield1=new JTextField(10);
	JTextField textfield2=new JTextField(10);
	JLabel label1=new JLabel("长");
	JLabel label2=new JLabel("宽");
	JPanel panel1=new JPanel();
	JPanel panel2=new JPanel();
	JPanel panel3=new JPanel();
	ButtonGroup buttongroup1=new ButtonGroup();
	JRadioButton radio1=new JRadioButton("矩形");
	JRadioButton radio2=new JRadioButton("园");
	JButton bt1=new JButton("画");
	int flag=0;
	int location1;
	int location2;
	test1 window1=this;
	test1(){
		Container contain=this.getContentPane();
		this.setSize(150,200);
		this.setVisible(true);
		contain.add(panel1);
		contain.add(panel2);
		contain.add(panel3);
		contain.add(bt1);
		contain.setLayout(new GridLayout(4,1));
		panel1.setLayout(new FlowLayout());
		panel1.add(label1);
		panel1.add(textfield1);
		panel2.setLayout(new FlowLayout());
		panel2.add(label2);
		panel2.add(textfield2);
		panel3.add(radio1);
		panel3.add(radio2);
		buttongroup1.add(radio1);
		buttongroup1.add(radio2);
		panel3.setLayout(new FlowLayout());
		bt1.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				 location1=Integer.parseInt(textfield1.getText());
				 location2=Integer.parseInt(textfield2.getText());
				test2 window2=new test2(window1,flag,location1,location2);
				window2.setSize(150,200);
				window2.setVisible(true);
				setVisible(false);
			} 
 
		}
			);
		radio1.addItemListener(new ItemListener(){
			public void itemStateChanged(ItemEvent e) {
				flag=0;	
			}
			});
		radio2.addItemListener(new ItemListener(){
			public void itemStateChanged(ItemEvent e){
				flag=1;
			}
 		});
		
	}
	public static void main(String args[]){
		new test1();
	}
}

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

public class test2 extends JFrame{
	JButton jb1=new JButton("返回");
	test1 window1;
	JPanel jp1;
	int flag,location1,location2;
	test2(test1 window,int flag1,int lo1,int lo2){
		window1=window;
		flag=flag1;
		location1=lo1;
		location2=lo2;
		 Container contain=this.getContentPane();
		 contain.add(jb1,"North");
		 if (flag==0)
		 	jp1=new draw_Rec(location1,location2);
		 else
		     jp1=new draw_Oval(location1,location2);
		 contain.add(jp1,"Center");
		 jb1.addActionListener(new ActionListener(){
		 	public void actionPerformed(ActionEvent e){
		 		dispose();
		 		window1.show();
		 	}
		 	});
	}
}


class draw_Rec extends JPanel{
	int a,b;
	public draw_Rec(int a,int b){
		this.a=a;this.b=b;
	}
	public void paint(Graphics g){
		super.paintComponents(g);
		g.setColor(Color.red);
		g.fillRect(a,b,100,100);
	}
}
class draw_Oval extends JPanel{
	int a,b;
	public draw_Oval(int a,int b){
		this.a=a;this.b=b;
	}
	public void paint(Graphics g){
		super.paintComponents(g);
		g.setColor(Color.red);
		g.drawOval(a,b,100,100);
	}
}