上机作业

import java.awt.BorderLayout;
        import java.awt.GridLayout;
        import java.awt.event.ActionEvent;
        import java.awt.event.ActionListener;

        import javax.swing.JButton;
        import javax.swing.JFrame;
        import javax.swing.JLabel;
        import javax.swing.JPanel;
        import javax.swing.JTextField;

public class test1 extends JFrame {
    JFrame jf;
    JPanel jp1,jp2,jp3,jp4,jp5,jp6,jp7,jp8,jp9;
    JTextField jt1,jt2,jt3;
    JButton jb1,jb2,jb3,jb4;
    JLabel jl1,jl2;
    public void creatjf(){
        jf = new JFrame("couter");
        jf.setLayout(null);
        jf.setLayout(new GridLayout(3,3));

        jt1 = new JTextField(5);
        jt2 = new JTextField(5);
        jt3 = new JTextField(5);

        jb1 = new JButton("sum");
        jb1.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent arg0) {
                int number1 = Integer.parseInt(jt1.getText().trim());
                int number2 = Integer.parseInt(jt2.getText().trim());
                int sum =number1+number2;
                jt3.setText(String.valueOf(sum));
            }

        });
        jb2 = new JButton("cancel");
        jb3 = new JButton();
        jb4 = new JButton();


        jl1 = new JLabel("newber"+1);
        jl2 = new JLabel("number"+2);

        jf.add(jl1);
        jf.add(jt1);
        jf.add(jb3);
        jf.add(jl2);
        jf.add(jt2);
        jf.add(jb4);
        jf.add(jb1);

        jf.add(jt3);
        jf.add(jb2);
        jf.setSize(300, 300);
        jf.setVisible(true);
    }
    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        new test1().creatjf();;
    }

}