midterm1: practice stuff

midterm1/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

midterm1/.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

midterm1/.idea/inspectionProfiles/Project_Default.xml

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+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Eslint" enabled="true" level="WARNING" enabled_by_default="true" />
+  </profile>
+</component>

midterm1/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="openjdk-22" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

midterm1/.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/midterm1.iml" filepath="$PROJECT_DIR$/midterm1.iml" />
+    </modules>
+  </component>
+</project>

midterm1/.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

midterm1/midterm1.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

midterm1/src/Animation.java

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+/**
+ * Animation Program that draws and moves a simple shape (e.g. butterfly, kite, etc.) on a timer event.
+ */
+public class Animation {
+    public static void main(String[] args) {
+        javax.swing.SwingUtilities.invokeLater(() -> {
+            javax.swing.JFrame frame = new javax.swing.JFrame("Animation");
+            frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
+            frame.setSize(400, 400);
+
+            javax.swing.JPanel panel = new javax.swing.JPanel() {
+                @Override
+                protected void paintComponent(java.awt.Graphics g) {
+                    super.paintComponent(g);
+                    g.setColor(java.awt.Color.RED);
+                    g.fillOval(getX(), getY(), 30, 30);
+                }
+            };
+            frame.add(panel);
+
+            javax.swing.Timer timer = new javax.swing.Timer(100, (e) -> {
+                panel.setLocation((panel.getX() + 1) % 20, (panel.getY() + 1) % 20);
+                panel.repaint();
+            });
+            timer.start();
+
+            frame.setVisible(true);
+        });
+    }
+}

midterm1/src/C4Q14.java

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+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+/**
+ * Write a program that shows a frame with three buttons labeled “Red”,
+ * “Green”, and “Blue”, and a label containing an icon showing a circle that is
+ * initially red. As the user clicks the buttons, the fill color of the circle should
+ * change. When you change the color, you need to invoke the repaint
+ * method on the label. The call to repaint ensures that the paintIcon method
+ * is called so that the icon can be repainted with the new color.
+ */
+public class C4Q14 {
+    public static void main(String[] args) {
+        javax.swing.SwingUtilities.invokeLater(() -> {
+            javax.swing.JFrame frame = new javax.swing.JFrame("C4Q14");
+            frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
+            frame.setSize(400, 400);
+            // frame.setLayout(new java.awt.BorderLayout());
+
+            javax.swing.JLabel label = new javax.swing.JLabel(new CircleIcon(java.awt.Color.RED, 300));
+            frame.add(label, java.awt.BorderLayout.CENTER);
+
+            javax.swing.JPanel panel = new javax.swing.JPanel();
+            panel.setLayout(new java.awt.FlowLayout());
+
+            javax.swing.JButton redButton = new javax.swing.JButton("Red");
+            redButton.addActionListener((e) -> {
+                label.setIcon(new CircleIcon(java.awt.Color.RED, 300));
+                label.repaint();
+            });
+            panel.add(redButton);
+
+            javax.swing.JButton greenButton = new javax.swing.JButton("Green");
+            greenButton.addActionListener((e) -> {
+                label.setIcon(new CircleIcon(java.awt.Color.GREEN, 300));
+                label.repaint();
+            });
+            greenButton.addActionListener(new ActionListener() {
+                @Override
+                public void actionPerformed(ActionEvent e) {
+                    label.setIcon(new CircleIcon(java.awt.Color.GREEN, 300));
+                    label.repaint();
+                }
+            });
+            panel.add(greenButton);
+
+            javax.swing.JButton blueButton = new javax.swing.JButton("Blue");
+            blueButton.addActionListener((e) -> {
+                label.setIcon(new CircleIcon(java.awt.Color.BLUE, 300));
+                label.repaint();
+            });
+            panel.add(blueButton);
+
+            // frame.add(panel, java.awt.BorderLayout.SOUTH);
+            frame.setVisible(true);
+        });
+    }
+}

midterm1/src/C4Q6.java

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+import java.util.ArrayList;
+import java.util.Comparator;
+
+public class C4Q6 {
+    public static void main(String[] args) {
+        ArrayList<String> a = new ArrayList<>(10);
+        a.add("a");
+        a.add("aa");
+        a.add("aaa");
+        a.add("aaaaa");
+        a.add("aaaa");
+
+        String max = maximum(a, (s1, s2) -> {
+            return Integer.compare(s1.length(), s2.length());
+        });
+
+        System.out.println(max);
+    }
+
+    public static String maximum(ArrayList<String> a, Comparator<String> c) {
+        String max = a.getFirst();
+        for (String s : a) {
+            if (c.compare(s, max) > 0) {
+                max = s;
+            }
+        }
+        return max;
+    }
+}

midterm1/src/C4Q9.java

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+import java.util.Arrays;
+import java.util.stream.Stream;
+
+public class C4Q9 {
+    public static void main(String[] args) {
+        String[] a = {"a", "aa", "aaa", "aaaa", "aaaaa"};
+        String[] res = filter(a, (s) -> {
+            return s.length() <= 3;
+        });
+
+        for (String s : res) {
+            System.out.println(s);
+        }
+    }
+
+    public static String[] filter(String[] a, Filter f) {
+        return Arrays.stream(a).filter((s) -> {
+            return f.accept(s);
+        }).toArray(String[]::new);
+    }
+}

midterm1/src/CircleIcon.java

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+import javax.swing.*;
+import java.awt.*;
+
+public class CircleIcon implements Icon {
+    private Color color;
+    private int size;
+
+    public CircleIcon(Color color, int size) {
+        this.color = color;
+        this.size = size;
+    }
+
+    public void paintIcon(Component c, Graphics g, int x, int y) {
+        g.setColor(color);
+        g.fillOval(x, y, size, size);
+    }
+
+    public int getIconWidth() {
+        return size;
+    }
+
+    public int getIconHeight() {
+        return size;
+    }
+
+    public void setColor(Color color) {
+        this.color = color;
+    }
+}

midterm1/src/Filter.java

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+public interface Filter {
+    boolean accept(String x);
+}

midterm1/src/MidtermQ1.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.geom.Ellipse2D;
+import java.util.ArrayList;
+
+/**
+ *
+ */
+public class MidtermQ1 {
+    public static void main(String[] args) {
+
+    }
+}
+
+class CirclePanel extends JPanel {
+    private Color color;
+
+    public void paintComponent(Graphics g) {
+        Graphics2D g2 = (Graphics2D) g;
+        g2.setColor(color);
+        g2.draw(new Ellipse2D.Double(0, 0, 100, 100));
+
+    }
+}