Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Grey lines of code can NOT be edited. NEW JAVA code inbetween lines 11 - 14 in photo.
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- import java.awt.*;public class TestRandomWalker {public static final int STEPS = 500;public static void main(String[] args) {RandomWalker walker = new RandomWalker(); // instantiate Walker objectDrawingPanel panel = new DrawingPanel(500, 500);Graphics g = panel.getGraphics();// advanced features -- center and zoom in the imagepanel.getGraphics().translate(250, 250);panel.getGraphics().scale(4, 4);// make the walker walk, and draw its movementint prevX = walker.getX(); // initialize Walker displayint prevY = walker.getY();for (int i = 1; i <= STEPS; i++) {g.setColor(Color.BLACK);g.drawLine(prevX, prevY, walker.getX(), walker.getY()); // update Walker display walker.move(); // move Walker 1 stepprevX = walker.getX(); // update x valueprevY = walker.getY(); // update y valueg.setColor(Color.RED); g.drawLine(prevX, prevY, walker.getX(), walker.getY()); // update Walker display int steps = walker.getSteps(); // record Walker stepsif (steps % 10 == 0) {System.out.println(steps + "…arrow_forwardFix the problem with this piece of code: public class SomethingIsWrong { public static void main(String[] args) { Rectangle myRect; myRect.width = 40; myRect.height = 50; System.out.println("myRect's area is " + myRect.area()); } }arrow_forwardPlease help, I don't know why this java matching game code is not working. image provided below shows what image program show import javax.swing.*;import java.awt.event.*;import java.awt.*; public class Halloween { // 2D array to store the Halloween-themed images final int[][] hallow = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}}; final int rows = 4; int cols = 3; JButton pics[] = new JButton[rows * cols]; public static void main(String[] args) { // Create a JFrame with a grid layout JFrame frame = new JFrame("Halloween"); frame.setLayout(new GridLayout(rows, cols)); // Add buttons to the JFrame int m = 0; for (int i = 0; i < rows; i++) { for (int j = 0; j < cols; j++) { pics[m] = new JButton(createImageIcon("back.png")); pics[m].addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { // Get the index…arrow_forward
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