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section4/ArrayFun.java

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+
+public class ArrayFun {
+    public static void main(String[] args) {
+        int[] myArray;
+        myArray = new int[5];
+
+        myArray[0] = 10;
+        myArray[1] = 22;
+        myArray[2] = 5;
+        myArray[3] = 17;
+        myArray[4] = 20;
+
+//        for(int i = 0; i < myArray.length; i++) {
+//            System.out.println(myArray[i]);
+//        }//end for
+
+        for(int num : myArray) {
+            System.out.println(num);
+        }
+    }//end main
+}

section4/ArrayListFun.java

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+import java.util.ArrayList;
+
+public class ArrayListFun {
+    public static void main(String[] args) {
+        ArrayList<String> namesList;
+        namesList = new ArrayList<>();
+
+
+
+        namesList.add("John");
+        namesList.add("Kyle");
+        namesList.add("Matthew");
+        namesList.add("Amanda");
+        namesList.add("Wendy");
+
+//        for(int i = 0; i < namesList.size(); i++) {
+//            System.out.println(namesList.get(i));
+//        }
+
+        for(String name : namesList) {
+            System.out.println(name);
+        }
+    }//end main
+}

section4/MoreArrayFun.java

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+
+public class MoreArrayFun {
+    public static void main(String[] args) {
+        int[] myArray = new int[10];
+
+        for(int i = 0; i < myArray.length; i++) {
+            myArray[i] = i + 1;
+        }
+
+        for(int num : myArray) {
+            System.out.println(num);
+        }
+    }//end main
+}

section4/Proj4_1_Arrays.java

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+import java.util.Scanner;
+
+public class Proj4_1_Arrays {
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+        int[] someValues = new int[5];
+
+        for(int i = 0; i < someValues.length; i++) {
+            System.out.print("enter an integer\t");
+            someValues[i] = keyboard.nextInt();
+        }//end for
+
+        for(int i = 0; i < someValues.length; i++) {
+            System.out.println("result is " + (someValues[i] * 2) );
+        }//end for
+    }//end main
+}

section4/Proj4_2_ArrayLists.java

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+import java.util.ArrayList;
+import java.util.Scanner;
+
+
+public class Proj4_2_ArrayLists {
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+        ArrayList<Double> myList = new ArrayList<>();
+
+        double input;
+
+        System.out.println("Enter 0 or more to put in the list " +
+                "or -1 to exit");
+
+        input = keyboard.nextDouble();
+
+        while(input >= 0) {
+            myList.add(input);
+            System.out.println("Enter 0 or more to put in the list " +
+                    "or -1 to exit");
+            input = keyboard.nextDouble();
+        }//end while
+
+        for(int i = myList.size() - 1; i >= 0; i--) {
+            System.out.println(myList.get(i));
+        }
+
+    }//end main
+}

section4/Proj4_3_Parallel.java

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+import java.util.Scanner;
+import java.util.ArrayList;
+
+
+public class Proj4_3_Parallel {
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+        ArrayList<String> names = new ArrayList<>();
+        ArrayList<Integer> ages = new ArrayList<>();
+
+        String name;
+        int age;
+
+        for(int i = 0; i < 5; i++) {
+            System.out.print("Enter a name:\t");
+            name = keyboard.nextLine();
+            System.out.print("Enter an age:\t");
+            age = keyboard.nextInt();
+            //consume newline
+            keyboard.nextLine();
+
+            names.add(name);
+            ages.add(age);
+            System.out.println();
+        }//end for
+
+        for(int i = 0; i < names.size(); i++) {
+            System.out.println(names.get(i) + " is " +
+                    ages.get(i) + " years old");
+        }//end for
+    }//end main
+}

section4/WrapperFun.java

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+import java.util.ArrayList;
+
+public class WrapperFun {
+    public static void main(String[] args) {
+        ArrayList<Integer> myAL = new ArrayList<>();
+
+        myAL.add(10);
+        myAL.add(22);
+
+        for(int i = 0; i < myAL.size(); i++) {
+
+            System.out.println(myAL.get(i));
+        }//end for
+
+        String someValue = "450";
+        int numericValue = Integer.parseInt(someValue);
+        numericValue += 10;
+
+        System.out.println(numericValue);
+
+        String strPi = "3.14159";
+
+        double myPi = Double.parseDouble(strPi);
+        myPi += 2.5;
+        System.out.println(myPi);
+    }//end main
+}