代码如下：

import java.awt.Graphics;
import javax.swing.*;
//*********Found********** 
public class Java_3 extends __________________ {
    int choice;
    public void init() {
        String input;
        input = JOptionPane.showInputDialog(
                "输入1去画直线\n"
                + "输入2去画矩形\n"
                + "输入3去画椭圆\n");
        //*********Found********** 
        choice = Integer.______________________(input);
    }
    //*********Found********** 
    public void paint(_____________________ ) {
        for (int i = 0; i < 10; i++) {
            switch (choice) {
                case 1:
                    g.drawLine(10, 10, 250, 10 + i * 10);
                    break;
                case 2:
                    g.drawRect(10 + i * 10, 10 + i * 10,
                            50 + i * 10, 50 + i * 10);
                    break;
                case 3:
                    g.drawOval(10 + i * 10, 10 + i * 10,
                            50 + i * 10, 50 + i * 10);
                    break;
                default:
                    JOptionPane.showMessageDialog(
                            null, "输入非法值");
            }
        }
    }
}