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section2/ArithmeticFun.java

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+
+
+public class ArithmeticFun {
+    public static void main(String[] args) {
+        int a = 10;
+        int b = 15;
+
+        //e.g., BINARY operators
+        int result = a + b;
+        int difference = a - b;
+        int product = a * b;
+        int quotient = b / a;
+        int remainder = b % a;
+
+        System.out.println("result is " + result);
+        System.out.println("diff is " + difference);
+        System.out.println("product is " + product);
+        System.out.println("quotient is " + quotient);
+        System.out.println("remainder is " + remainder);
+
+        result += 20;   //result = result + 20
+        System.out.println("result is now " + result);
+
+        //UNARY operators
+        result++;   //++result;
+        System.out.println("result++  " + result);
+
+        result--;   //--result;
+        System.out.println("result--  " + result);
+
+        product *= 2;   //product = product * 2;
+        System.out.println("final value of product is " + product);
+    }
+}

section2/CommentFun.java

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+/*
+    John Baugh
+    Learning Some Java 101
+    This is a multiline comment
+    July 30, 2060
+ */
+
+public class CommentFun {
+    /*
+        main is the entry point to the application.
+     */
+
+    public static void main(String[] args) {
+        System.out.println("Printing stuff");  //print stuff to console
+        //this doesn't print
+        //these are single line comments
+    }//end main
+}

section2/ConversionFun.java

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+
+
+public class ConversionFun {
+    public static void main(String[] args) {
+        double myDouble = 3.14;
+        float myFloat = 3.14f;  //narrowing/lossy conversion
+        double yourDouble = myFloat;  //widening/lossless conversion
+
+    }//end main
+}

section2/HelloWorld.java

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+
+public class HelloWorld {
+
+    public static void main(String[] args) {
+      System.out.println("Hello world!");
+      System.out.println("Hello John!");
+
+    }
+}

section2/KeyboardInput.java

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+import java.util.Scanner;
+
+public class KeyboardInput {
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+        String name;
+        String city;
+        int age;
+        double dubInput;
+
+        System.out.println("What is your name?");
+        name = keyboard.nextLine();
+
+        System.out.println("What's your age?");
+        age = keyboard.nextInt();
+        keyboard.nextLine();  //consume the newline
+
+        System.out.println("What's your real number?");
+        dubInput = keyboard.nextDouble();
+        keyboard.nextLine();
+        dubInput *= 2;   //dubInput = dubInput * 2;
+
+        System.out.println("What city do you live in?");
+        city = keyboard.nextLine();
+
+        System.out.println("Hello, " + name);
+        System.out.println("age is " + age);
+        System.out.println("city is " + city);
+        System.out.println("Twice your number is " + dubInput);
+    }//end main
+}

section2/LogicalFun.java

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+
+
+public class LogicalFun {
+    public static void main(String[] args) {
+        boolean isRaining = false;
+        boolean isWarm = false;
+
+        boolean combined = isRaining && isWarm;
+
+        System.out.println("Is it raining and warm?: " + combined);
+
+        combined = isRaining || isWarm;
+
+        System.out.println("Is it raining OR warm?: " + combined);
+
+        combined = !isRaining;
+
+        System.out.println("Is it NOT raining outside?: " + combined);
+    }//end main
+}

section2/Proj2_1_AverageOfThree.java

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+import java.util.Scanner;
+
+public class Proj2_1_AverageOfThree {
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+
+        double num1;
+        double num2;
+        double num3;
+        double average;
+
+        System.out.println("Please enter three numbers");
+        num1 = keyboard.nextDouble();
+        num2 = keyboard.nextDouble();
+        num3 = keyboard.nextDouble();
+        keyboard.nextLine();  //good habit
+
+        average = (num1 + num2 + num3) / 3.0;
+
+        System.out.println("Average is " + average);
+
+    }//end main
+}

section2/Proj2_2_MadLibsClone.java

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+import java.util.Scanner;
+
+
+public class Proj2_2_MadLibsClone {
+
+    public static void main(String[] args) {
+        Scanner keyboard = new Scanner(System.in);
+
+        String adjective1;
+        String girlsName;
+        String adjective2;
+        String occupation1;
+        String placeName;
+        String clothing;
+        String hobby;
+        String adjective3;
+        String occupation2;
+        String boysName;
+        String mansName;
+
+        System.out.print("Enter an adjective\t");
+        adjective1 = keyboard.nextLine();
+
+        System.out.print("Enter a girl's name:\t");
+        girlsName = keyboard.nextLine();
+
+        System.out.print("Enter another adjective:\t");
+        adjective2 = keyboard.nextLine();
+
+        System.out.print("Enter an occupation:\t");
+        occupation1 = keyboard.nextLine();
+
+        System.out.print("Enter the name of a place:\t");
+        placeName = keyboard.nextLine();
+
+        System.out.print("Enter the name of a piece of clothing:\t");
+        clothing = keyboard.nextLine();
+
+        System.out.print("Enter the name of a hobby:\t");
+        hobby = keyboard.nextLine();
+
+        System.out.print("Enter another adjective:\t");
+        adjective3 = keyboard.nextLine();
+
+        System.out.print("Enter another occupation:\t");
+        occupation2 = keyboard.nextLine();
+
+        System.out.print("Enter a boy's name:\t");
+        boysName = keyboard.nextLine();
+
+        System.out.print("Enter a man's name:\t");
+        mansName = keyboard.nextLine();
+
+        System.out.println();
+
+        System.out.println("There once was a " + adjective1 + " girl named " + girlsName + " who was a " +
+                adjective2 + " " + occupation1 + " in the Kingdom of " + placeName + ".");
+
+        System.out.println("She loved to wear " + clothing + " and to " + hobby + ". She wanted to marry the " +
+                adjective3 + " " + occupation2 + " named " + boysName + " but her father, King " + mansName +
+                " forbid her from seeing him.");
+    }//end main
+}

section2/RelationalFun.java

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+
+public class RelationalFun {
+    public static void main(String[] args) {
+        boolean myBool = true;
+        boolean yourBool = false;
+        int myAge = 37;
+        int yourAge = 20;
+        int bobsAge = 20;
+
+        String myName = "John";
+        String yourName = "Johnny";
+
+        System.out.println("myBool is " + myBool);
+        System.out.println("yourBool is " + yourBool);
+
+        //relational operations
+        boolean ageComparison = myAge > yourAge;
+        System.out.println("myAge > yourAge?: " + ageComparison);
+
+        ageComparison = yourAge > bobsAge;
+        System.out.println("yourAge > bobsAge?:" + ageComparison);
+
+        ageComparison = yourAge == bobsAge;
+        System.out.println("yourAge == bobsAge?: " + ageComparison);
+
+        boolean nameComparison = myName.equals(yourName);
+        System.out.println("do names match?: " + nameComparison);
+
+        int currentAge = 37;
+
+        boolean isGreater21 = currentAge >= 21;
+
+        System.out.println("currentAge >= 21?: " + isGreater21);
+
+    }//end main
+}

section2/VariableFun.java

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+
+
+public class VariableFun {
+    public static void main(String[] args) {
+        int myAge;   //declaration
+        myAge = 19;  //initialization
+
+        final int SOME_NUM = 150;
+
+        String name = "Billy";
+
+        String myHomeTown = "Dearborn";
+
+        System.out.println(name + " is " + myAge);
+        System.out.println(myHomeTown);
+    }
+}